March 2017 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

where is __percpu_seg initialized?
by 落痕 March 28, 2018

March 28, 2018

Hi all: I knew the kernel implement the per-cpu variable via __percpu_seg. For example on x86 architecture, it's defined as: #ifdef CONFIG_X86_64 #define __percpu_seg gs #define __percpu_mov_op movq #else #define __percpu_seg fs #define __percpu_mov_op movl #endif But I'm curious where __percpu_seg is initialized?? I fail to find the relative code. Thanks.

2 2

How to handle Hotplug with UIO userspace driver
by Mandeep Sandhu Sept. 28, 2017

Sept. 28, 2017

Hi All, We're working on a custom PCIe based hardware, which can be hotplugged into the system. We're using the UIO approach of having a minimal kernel driver which basically handles the interrupt and provides a mmap of the device memory to userspace and userspace driver which mmap's the provided memory and manages the device. We're using systemd and udev rules to spawn off a user process whenever the hardware is plugged into the system. Now my question is, how can we gracefully inform the userspace process if someone pulls out the hardware (sitting on a PCI slot). Even with full hotplug support, there can always be a case of "surprise removal", where someone yanks the board without going through the whole "attention button" routine. While the kernel driver has no problem with hot-removal, I see that if I "unregister" our UIO driver in response to the removal, then the mapping for the hardware's physical memory would become "invalid" (done by UIO on unregsiter). This could possibly cause the user-space process to crash due to illegal memory access. Is there a "standard" way to handle this scenario, i.e for hotpluggable hardware using UIO? Basically, we'd want to "unregister" the UIO device only after the userspace process is informed of the removal so that it could unmap/close the device and exit gracefully. We could try doing it using some systemd trick, where we put a dependency on one of the UIO created files (/dev/uioX), so that when the file is destroyed, systemd could kill/shutdown the process. Although, there's no guarantee that the userspace process won't try to access the mmaped space during that interval, so this isn't a reliable solution either. Any hints, thoughts? Thanks., -mandeep

3 7

Error while sending a mail from mutt
by AYAN KUMAR HALDER April 16, 2017

April 16, 2017

Hi, I am trying to send a mail using mutt. I am getting the error as follows :- SMTP session failed: 501 5.5.4 I understand the error meant that a valid mail transaction protocol was used with invalid arguments. Please let me know how do I debug this issue further. Regards, Ayan Kumar Halder

6 8

&array[0] vs array
by Tobin C. Harding April 3, 2017

April 3, 2017

Does the kernel community have a preference when using the address of the first element of an an array? 1. addr = &array[0] 2. addr = array; $ grep '\&.*\[0\]' | wc -l 10077 style (1) is clearly used, I was not able to grep for instances where style (2) is used. thanks, Tobin.

3 3

What are need to makes humidifier?
by 윤영석 April 1, 2017

April 1, 2017

Hi, I want to make own humidifier. What sensor need when making humidifier?? humidity indicator (detecting humidity), ultrasonic waves maker?? Please shares your wisdom to me. Thanks. Best regards.

2 1

Have been tested with 4 usb wifi adaptor, all loss packet when ping to router
by Hao Zhang March 31, 2017

March 31, 2017

hi all, i use usb wifi dongle rt5370/rt3070/rtl8192cus/rtl8178 on embeded board based kernel 3.10.0 , they all loss packet when ping to router, and then ifconfig can show below that it seem some packet were been dropped, What does that dropped means? is it mean the receive buffer is too small to receive packet？ how can i trace it and fix it? some info from ifconfig (sometime it loss packet when ping to router, but that count of dropped didnt increase and sometime i do nothing to it , but it will increase automatic.) # ifconfig wlan0 Link encap:Ethernet HWaddr 00:19:86:41:1A:54 inet addr:10.0.0.110 Bcast:10.255.255.255 Mask:255.0.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:235 errors:0 dropped:4 overruns:0 frame:0 TX packets:86 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:63770 (62.2 KiB) TX bytes:9976 (9.7 KiB) some info from dmesg: cfg80211: Calling CRDA to update world regulatory domain usb 1-2: reset high-speed USB device number 3 using hiusb-ehci ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 5390, rev 0502 detected ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 5370 detected ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' usbcore: registered new interface driver rt2800usb ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin' ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.22 wlan0: authenticate with 20:76:93:37:60:04 wlan0: send auth to 20:76:93:37:60:04 (try 1/3) wlan0: authenticated wlan0: associate with 20:76:93:37:60:04 (try 1/3) wlan0: RX AssocResp from 20:76:93:37:60:04 (capab=0x411 status=0 aid=1) wlan0: associated when connect to router: /home/wifi-tool/ap_client_tool # /home/wifi-tool/ap_client_tool # ./wpa_supplicant -d -Dwext -i wlan0 -c ./wpa_su pplicant.conf -t -d ./log.txt & /home/wifi-tool/ap_client_tool # 133.647693: wpa_supplicant v0.8.x_rtw_r7475.20130812_beta 133.650368: random: Trying to read entropy from /dev/random 133.650447: Initializing interface 'wlan0' conf './wpa_supplicant.conf' driver 'wext' ctrl_interface 'N/A' bri' 133.650527: Configuration file './wpa_supplicant.conf' -> '/home/wifi-tool/ap_client_tool/./wpa_supplicant.con' 133.650565: Reading configuration file '/home/wifi-tool/ap_client_tool/./wpa_supplicant.conf' 133.651341: ctrl_interface='/var/run/wpa_supplicant' 133.651394: Line: 3 - start of a new network block 133.651455: ssid - hexdump_ascii(len=8): 44 72 65 61 6d 62 6f 78 Dreambox 133.651532: PSK (ASCII passphrase) - hexdump_ascii(len=10): [REMOVED] 133.783164: PSK (from passphrase) - hexdump(len=32): [REMOVED] 133.783275: Priority group 0 133.783299: id=0 ssid='Dreambox' 133.783490: WEXT: cfg80211-based driver detected 133.783636: wext: interface wlan0 phy: phy0 133.783783: rfkill: Cannot open RFKILL control device 133.783828: WEXT: RFKILL status not available 133.783985: SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf 133.784027: capabilities: key_mgmt 0xf enc 0xf flags 0x0 133.793058: netlink: Operstate: linkmode=1, operstate=5 133.793300: wlan0: Own MAC address: 00:19:86:41:1a:54 133.793343: wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0 133.793402: wpa_driver_wext_set_key: alg=0 key_idx=1 set_tx=0 seq_len=0 key_len=0 133.793443: wpa_driver_wext_set_key: alg=0 key_idx=2 set_tx=0 seq_len=0 key_len=0 133.793480: wpa_driver_wext_set_key: alg=0 key_idx=3 set_tx=0 seq_len=0 key_len=0 133.793517: wpa_driver_wext_set_countermeasures 133.793561: wlan0: RSN: flushing PMKID list in the driver 133.793621: wlan0: Setting scan request: 0 sec 100000 usec 133.793666: WPS: Set UUID for interface wlan0 133.793713: WPS: UUID based on MAC address - hexdump(len=16): 7f 85 0b 16 18 c7 58 66 97 b9 4e 08 a0 0f b9 e2 133.793829: EAPOL: SUPP_PAE entering state DISCONNECTED 133.793863: EAPOL: Supplicant port status: Unauthorized 133.793888: EAPOL: KEY_RX entering state NO_KEY_RECEIVE 133.793903: EAPOL: SUPP_BE entering state INITIALIZE 133.793924: EAP: EAP entering state DISABLED 133.793952: EAPOL: Supplicant port status: Unauthorized 133.793973: EAPOL: Supplicant port status: Unauthorized 133.795262: wlan0: Added interface wlan0 133.795439: random: Got 20/20 bytes from /dev/random 133.795532: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 133.795574: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 133.795641: wlan0: Event 5 received on interface wlan0 133.795669: Wireless event: cmd=0x8b06 len=8 133.795698: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 133.795728: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 133.795760: wlan0: Event 5 received on interface wlan0 133.795780: Wireless event: cmd=0x8b1a len=8 133.900079: wlan0: State: DISCONNECTED -> SCANNING 133.900128: wlan0: Starting AP scan for wildcard SSID 133.900273: Scan requested (ret=0) - scan timeout 5 seconds 134.800042: EAPOL: disable timer tick 134.800113: EAPOL: Supplicant port status: Unauthorized 135.170113: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 135.170211: RTM_NEwlan0: authenticate with 20:76:93:37:60:04 WLINK, IFLA_IFNAME: Interface 'wlan0' added 135.170255: wlan0: Event 5 received on interface wlan0 135.170280: Wireless event: cmd=0x8b19 len=8 135.170312: wlan0: Event 3 received on interface wlan0 135.170478: Scan results did not fit - trying larger buffer (8192 bytes) 135.170845: Received 7179 bytes of scan results (15 BSSes) 135.170969: wlan0: BSS: Start scan result update 1 135.171027: wlan0: BSS: Add new id 0 BSSID 20:76:93:37:60:04 SSID 'Dreambox' 135.171099: wlan0: BSS: Add new id 1 BSSID 14:b8:37:25:cb:5b SSID 'ChinaNet-hd4r' 135.171164: wlan0: BSS: Add new id 2 BSSID fc:37:2b:50:9a:41 SSID 'ChinaNet-y7cf' 135.171227: wlan0: BSS: Add new id 3 BSSID c8:3wlan0: send auth to 20:76:93:37:60:04 (try 1/3) a:35:4b:db:b0 SSID 'Tenda_4BDBB0' 135.171289: wlan0: BSS: Add new id 4 BSSID 40:f4:20:ewlan0: authenticated 1:26:3a SSID 'ChinaNet-yH4T' 135.171353: wlan0: BSS: Add new id 5 BSSID d8:15:0d:68:ed:ba SSID '703' 135.17141wlan0: associate with 20:76:93:37:60:04 (try 1/3) 7: wlan0: BSS: Add new id 6 BSSID 1c:60:de:d6:58:60 SSID '' 135.171479: wlan0: BSS: Add new id 7 BSSID wlan0: RX AssocResp from 20:76:93:37:60:04 (capab=0x411 status=0 ai) 5c:63:bf:d0:90:9c SSID 'TP-LINK_707' 135.171551: wlan0: BSS: Add new id 8 BSSID 8c:f2:28:52:94:1c SSID 'SZBKT2'wlan0: associated 135.171616: wlan0: BSS: Add new id 9 BSSID c8:3a:35:3c:0b:78 SSID 'Tenda_3C0B78' 135.171679: wlan0: BSS: Add new id 10 BSSID 38:83:45:94:8d:a0 SSID 'hzb' 135.171742: wlan0: BSS: Add new id 11 BSSID 00:bd:82:56:32:d2 SSID 'ChinaNet-jVKG' 135.171805: wlan0: BSS: Add new id 12 BSSID 8c:f2:28:62:d8:74 SSID 'MERCURY_D874' 135.171868: wlan0: BSS: Add new id 13 BSSID 1c:60:de:bb:e0:f0 SSID '503' 135.171930: wlan0: BSS: Add new id 14 BSSID ec:26:ca:4c:80:00 SSID 'lyy' 135.171980: Add randomness: count=1 entropy=0 135.172012: Add randomness: count=2 entropy=1 135.172031: Add randomness: count=3 entropy=2 135.172050: Add randomness: count=4 entropy=3 135.172069: Add randomness: count=5 entropy=4 135.172088: Add randomness: count=6 entropy=5 135.172106: Add randomness: count=7 entropy=6 135.172125: Add randomness: count=8 entropy=7 135.172144: Add randomness: count=9 entropy=8 135.172162: Add randomness: count=10 entropy=9 135.172195: wlan0: New scan results available 135.172302: wlan0: Selecting BSS from priority group 0 135.172363: wlan0: 0: 20:76:93:37:60:04 ssid='Dreambox' wpa_ie_len=22 rsn_ie_len=20 caps=0x11 level=-45 135.172406: wlan0: selected based on RSN IE 135.172453: wlan0: selected BSS 20:76:93:37:60:04 ssid='Dreambox' 135.172533: wlan0: Request association: reassociate: 0 selected: 20:76:93:37:60:04 bssid: 00:00:00:00:00:00 G 135.172582: wlan0: Trying to associate with 20:76:93:37:60:04 (SSID='Dreambox' freq=2412 MHz) 135.172607: wlan0: Cancelling scan request 135.172631: wlan0: WPA: clearing own WPA/RSN IE 135.172655: wlan0: Automatic auth_alg selection: 0x1 135.172694: wlan0: RSN: using IEEE 802.11i/D9.0 135.172731: wlan0: WPA: Selected cipher suites: group 16 pairwise 16 key_mgmt 2 proto 2 135.172751: WPA: set AP WPA IE - hexdump(len=24): dd 16 00 50 f2 01 01 00 00 50 f2 04 01 00 00 50 f2 04 01 00 2 135.172844: WPA: set AP RSN IE - hexdump(len=22): 30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f ac 02 0 135.172944: wlan0: WPA: using GTK CCMP 135.172966: wlan0: WPA: using PTK CCMP 135.172989: wlan0: WPA: using KEY_MGMT WPA-PSK 135.173010: WPA: Set own WPA IE default - hexdump(len=22): 30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0 135.173102: wlan0: No keys have been configured - skip key clearing 135.173130: wlan0: State: SCANNING -> ASSOCIATING 135.173149: wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT) 135.173174: netlink: Operstate: linkmode=-1, operstate=5 135.173227: wpa_driver_wext_associate 135.173341: wpa_driver_wext_set_drop_unencrypted 135.173443: wpa_driver_wext_set_psk ioctl[SIOCSIWFREQ]: Device or resource busy 135.244635: wlan0: Association request to the driver failed 135.244695: wlan0: Setting authentication timeout: 5 sec 0 usec 135.244725: EAPOL: External notification - EAP success=0 135.244747: EAPOL: Supplicant port status: Unauthorized 135.244769: EAPOL: External notification - EAP fail=0 135.244787: EAPOL: Supplicant port status: Unauthorized 135.244804: EAPOL: External notification - portControl=Auto 135.244822: EAPOL: Supplicant port status: Unauthorized 135.244851: wlan0: Checking for other virtual interfaces sharing same radio (phy0) in event_scan_results 135.244899: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 135.244933: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.244966: wlan0: Event 5 received on interface wlan0 135.244987: Wireless event: cmd=0x8b1a len=8 135.245010: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 135.245038: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.245070: wlan0: Event 5 received on interface wlan0 135.245089: Wireless event: cmd=0x8b06 len=8 135.592544: RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP]) 135.592605: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.592649: wlan0: Event 5 received on interface wlan0 135.592673: Wireless event: cmd=0x8b1a len=16 135.592701: RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP]) 135.592731: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.592763: wlan0: Event 5 received on interface wlan0 135.592787: RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP]) 135.592817: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.592848: wlan0: Event 5 received on interface wlan0 135.592867: Wireless event: cmd=0x8c08 len=187 135.592885: AssocResp IE wireless event - hexdump(len=179): 01 08 82 84 8b 96 12 24 48 6c 32 04 0c 18 30 60 dd0 135.593447: RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP]) 135.593479: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 135.593511: wlan0: Event 5 received on interface wlan0 135.593530: Wireless event: cmd=0x8b15 len=20 135.593548: Wireless event: new AP: 20:76:93:37:60:04 135.593588: wlan0: Event 4 received on interface wlan0 135.593611: wlan0: Association info event 135.593629: resp_ies - hexdump(len=179): 01 08 82 84 8b 96 12 24 48 6c 32 04 0c 18 30 60 dd 18 00 50 f2 02 01 0 135.594195: wlan0: Event 0 received on interface wlan0 135.594223: wlan0: State: ASSOCIATING -> ASSOCIATED 135.594242: wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT) 135.594268: netlink: Operstate: linkmode=-1, operstate=5 135.594349: wlan0: Associated to a new BSS: BSSID=20:76:93:37:60:04 135.594373: Add randomness: count=11 entropy=10 135.594403: wlan0: No keys have been configured - skip key clearing 135.594443: wlan0: Associated with 20:76:93:37:60:04 135.594468: wlan0: WPA: Association event - clear replay counter 135.594491: wlan0: WPA: Clear old PTK 135.594510: EAPOL: External notification - portEnabled=0 135.594529: EAPOL: Supplicant port status: Unauthorized 135.594551: EAPOL: External notification - portValid=0 135.594568: EAPOL: Supplicant port status: Unauthorized 135.594594: EAPOL: External notification - EAP success=0 135.594611: EAPOL: Supplicant port status: Unauthorized 135.594628: EAPOL: External notification - portEnabled=1 135.594644: EAPOL: SUPP_PAE entering state CONNECTING 135.594658: EAPOL: enable timer tick 135.594677: EAPOL: SUPP_BE entering state IDLE 135.594705: wlan0: Setting authentication timeout: 10 sec 0 usec 135.594732: wlan0: Cancelling scan request 135.594835: wlan0: RX EAPOL from 20:76:93:37:60:04 135.594861: RX EAPOL - hexdump(len=99): 01 03 00 5f 02 00 8a 00 10 00 00 00 00 00 00 00 01 2f be 0d 1c 3e 3a e0 135.927831: wlan0: Setting authentication timeout: 10 sec 0 usec 135.927917: wlan0: IEEE 802.1X RX: version=1 type=3 length=95 135.927954: wlan0: EAPOL-Key type=2 135.928001: wlan0: key_info 0x8a (ver=2 keyidx=0 rsvd=0 Pairwise Ack) 135.928029: wlan0: key_length=16 key_data_length=0 135.928047: replay_counter - hexdump(len=8): 00 00 00 00 00 00 00 01 135.928091: key_nonce - hexdump(len=32): 2f be 0d 1c 3e 3a e4 a1 85 c9 e6 e5 5d 03 4d 5a a2 c2 9c 35 75 9b 26 135.928201: key_iv - hexdump(len=16): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 135.928267: key_rsc - hexdump(len=8): 00 00 00 00 00 00 00 00 135.928309: key_id (reserved) - hexdump(len=8): 00 00 00 00 00 00 00 00 135.928351: key_mic - hexdump(len=16): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 135.928423: WPA: RX EAPOL-Key - hexdump(len=99): 01 03 00 5f 02 00 8a 00 10 00 00 00 00 00 00 00 01 2f be 0d 10 135.928796: wlan0: State: ASSOCIATED -> 4WAY_HANDSHAKE 135.928845: wlan0: WPA: RX message 1 of 4-Way Handshake from 20:76:93:37:60:04 (ver=2) 135.928866: RSN: msg 1/4 key data - hexdump(len=0): 135.928886: Get randomness: len=32 entropy=11 135.929133: WPA: Renewed SNonce - hexdump(len=32): ca 30 c8 f1 9a 25 2f 64 dc d4 ac 69 c3 dc 5c c1 18 5c b4 e3c 135.929330: WPA: PTK derivation - A1=00:19:86:41:1a:54 A2=20:76:93:37:60:04 135.929378: WPA: Nonce1 - hexdump(len=32): ca 30 c8 f1 9a 25 2f 64 dc d4 ac 69 c3 dc 5c c1 18 5c b4 e3 b3 aa 5c 135.929490: WPA: Nonce2 - hexdump(len=32): 2f be 0d 1c 3e 3a e4 a1 85 c9 e6 e5 5d 03 4d 5a a2 c2 9c 35 75 9b 26 135.929600: WPA: PMK - hexdump(len=32): [REMOVED] 135.929619: WPA: PTK - hexdump(len=48): [REMOVED] 135.929638: WPA: WPA IE for msg 2/4 - hexdump(len=22): 30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f a0 135.929726: WPA: Replay Counter - hexdump(len=8): 00 00 00 00 00 00 00 01 135.929777: wlan0: WPA: Sending EAPOL-Key 2/4 135.929821: WPA: KCK - hexdump(len=16): [REMOVED] 135.929842: WPA: Derived Key MIC - hexdump(len=16): 12 33 63 9c 55 75 e6 42 8c 03 3d c2 6b 75 77 97 135.929914: WPA: TX EAPOL-Key - hexdump(len=121): 01 03 00 75 02 01 0a 00 00 00 00 00 00 00 00 00 01 ca 30 c8 0 136.050174: wlan0: RX EAPOL from 20:76:93:37:60:04 136.050216: RX EAPOL - hexdump(len=155): 01 03 00 97 02 13 ca 00 10 00 00 00 00 00 00 00 02 2f be 0d 1c 3e 3a 6 136.050861: wlan0: IEEE 802.1X RX: version=1 type=3 length=151 136.050928: wlan0: EAPOL-Key type=2 136.050976: wlan0: key_info 0x13ca (ver=2 keyidx=0 rsvd=0 Pairwise Install Ack MIC Secure Encr) 136.051041: wlan0: key_length=16 key_data_length=56 136.051062: replay_counter - hexdump(len=8): 00 00 00 00 00 00 00 02 136.051105: key_nonce - hexdump(len=32): 2f be 0d 1c 3e 3a e4 a1 85 c9 e6 e5 5d 03 4d 5a a2 c2 9c 35 75 9b 26 136.051276: key_iv - hexdump(len=16): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 136.051354: key_rsc - hexdump(len=8): 1e 06 00 00 00 00 00 00 136.051426: key_id (reserved) - hexdump(len=8): 00 00 00 00 00 00 00 00 136.051470: key_mic - hexdump(len=16): fe 44 dc 7c 79 6a 75 ac d8 ab eb 37 0c 43 bd 92 136.051575: WPA: RX EAPOL-Key - hexdump(len=155): 01 03 00 97 02 13 ca 00 10 00 00 00 00 00 00 00 02 2f be 0d 6 136.052227: RSN: encrypted key data - hexdump(len=56): 75 ae 6b ee 05 75 84 e4 60 f1 b0 19 d2 15 0c da ed aa 66 136.052661: WPA: decrypted EAPOL-Key key data - hexdump(len=48): [REMOVED] 136.052713: wlan0: State: 4WAY_HANDSHAKE -> 4WAY_HANDSHAKE 136.052799: wlan0: WPA: RX message 3 of 4-Way Handshake from 20:76:93:37:60:04 (ver=2) 136.052823: WPA: IE KeyData - hexdump(len=48): 30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f ac 02 00 0 136.385952: WPA: RSN IE in EAPOL-Key - hexdump(len=22): 30 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f 0 136.386064: WPA: GTK in EAPOL-Key - hexdump(len=24): [REMOVED] 136.386105: wlan0: WPA: Sending EAPOL-Key 4/4 136.386161: WPA: KCK - hexdump(len=16): [REMOVED] 136.386185: WPA: Derived Key MIC - hexdump(len=16): c8 01 93 34 66 d9 4e 6f 64 20 ad fc b2 11 39 81 136.386251: WPA: TX EAPOL-Key - hexdump(len=99): 01 03 00 5f 02 03 0a 00 00 00 00 00 00 00 00 00 02 00 00 00 00 136.386690: wlan0: WPA: Installing PTK to the driver 136.386724: wpa_driver_wext_set_key: alg=3 key_idx=0 set_tx=1 seq_len=6 key_len=16 136.389764: EAPOL: External notification - portValid=1 136.389823: wlan0: State: 4WAY_HANDSHAKE -> GROUP_HANDSHAKE 136.389846: RSN: received GTK in pairwise handshake - hexdump(len=18): [REMOVED] 136.389870: WPA: Group Key - hexdump(len=16): [REMOVED] 136.389902: wlan0: WPA: Installing GTK to the driver (keyidx=1 tx=0 len=16) 136.389921: WPA: RSC - hexdump(len=6): 1e 06 00 00 00 00 136.389958: wpa_driver_wext_set_key: alg=3 key_idx=1 set_tx=0 seq_len=6 key_len=16 136.391302: wlan0: WPA: Key negotiation completed with 20:76:93:37:60:04 [PTK=CCMP GTK=CCMP] 136.391345: wlan0: Cancelling authentication timeout 136.391377: wlan0: State: GROUP_HANDSHAKE -> COMPLETED 136.391422: wlan0: CTRL-EVENT-CONNECTED - Connection to 20:76:93:37:60:04 completed (auth) [id=0 id_str=] 136.391445: wpa_driver_wext_set_operstate: operstate 0->1 (UP) 136.391470: netlink: Operstate: linkmode=-1, operstate=6 136.391560: EAPOL: External notification - portValid=1 136.391591: EAPOL: External notification - EAP success=1 136.391611: EAPOL: SUPP_PAE entering state AUTHENTICATING 136.391626: EAPOL: SUPP_BE entering state SUCCESS 136.391641: EAP: EAP entering state DISABLED 136.391655: EAPOL: SUPP_PAE entering state AUTHENTICATED 136.391670: EAPOL: Supplicant port status: Authorized 136.391687: EAPOL: SUPP_BE entering state IDLE 136.391703: EAPOL authentication completed successfully 136.391769: RTM_NEWLINK: operstate=1 ifi_flags=0x11043 ([UP][RUNNING][LOWER_UP]) 136.391806: RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added 136.391843: wlan0: Event 5 received on interface wlan0 136.600042: EAPOL: startWhen --> 0 136.600091: EAPOL: disable timer tick 324.170085: wlan0: BSS: Expire BSS 1 due to age 324.170174: wlan0: BSS: Remove id 1 BSSID 14:b8:37:25:cb:5b SSID 'wwwwwwwwww-hd4r' 324.170224: wlan0: BSS: Expire BSS 2 due to age 324.170266: wlan0: BSS: Remove id 2 BSSID fc:37:2b:50:9a:41 SSID 'wwwwwwwww-y7cf' 324.170311: wlan0: BSS: Expire BSS 3 due to age 324.170351: wlan0: BSS: Remove id 3 BSSID c8:3a:35:4b:db:b0 SSID 'xxxxxxx' 324.170395: wlan0: BSS: Expire BSS 4 due to age 324.170435: wlan0: BSS: Remove id 4 BSSID 40:f4:20:e1:26:3a SSID 'xxxxxxxx-yH4T' 324.170478: wlan0: BSS: Expire BSS 5 due to age 324.170518: wlan0: BSS: Remove id 5 BSSID d8:15:0d:68:ed:ba SSID 'xxxxxxxxxx' 324.170562: wlan0: BSS: Expire BSS 6 due to age 324.170602: wlan0: BSS: Remove id 6 BSSID 1c:60:de:d6:58:60 SSID 'xxxx' 324.170645: wlan0: BSS: Expire BSS 7 due to age 324.170685: wlan0: BSS: Remove id 7 BSSID 5c:63:bf:d0:90:9c SSID 'xxxxxxxx-xxxxx' 324.170736: wlan0: BSS: Expire BSS 8 due to age 324.170777: wlan0: BSS: Remove id 8 BSSID 8c:f2:28:52:94:1c SSID 'xxxxxxxxx' 324.170821: wlan0: BSS: Expire BSS 9 due to age 324.170862: wlan0: BSS: Remove id 9 BSSID c8:3a:35:3c:0b:78 SSID 'xxxxxxxxxx' 324.170905: wlan0: BSS: Expire BSS 10 due to age 324.170945: wlan0: BSS: Remove id 10 BSSID 38:83:45:94:8d:a0 SSID 'xxxxxxxxxxxx' 324.170989: wlan0: BSS: Expire BSS 11 due to age 324.171029: wlan0: BSS: Remove id 11 BSSID 00:bd:82:56:32:d2 SSID 'xxxxxxxxx-jVKG' 324.171074: wlan0: BSS: Expire BSS 12 due to age 324.171114: wlan0: BSS: Remove id 12 BSSID 8c:f2:28:62:d8:74 SSID 'xxxxxxxx' 324.171158: wlan0: BSS: Expire BSS 13 due to age 324.171198: wlan0: BSS: Remove id 13 BSSID 1c:60:de:bb:e0:f0 SSID 'xxxxxxxxxx' 324.171242: wlan0: BSS: Expire BSS 14 due to age 324.171282: wlan0: BSS: Remove id 14 BSSID ec:26:ca:4c:80:00 SSID 'lyy' Regards :)

2 1

Where do the staging driver patches go?
by Aishwarya Pant March 31, 2017

March 31, 2017

Hi I was wondering what is the appropriate mailing list for sending staging driver clean-up patches and like. First patch tutorial suggests maintainers plus mailing lists, but I don't see many staging patches on LKML. driverdev-devel(a)linuxdriverproject.org seems like a candidate, but I'm not so sure. thanks aishwarya

2 1

patch splitting
by Tobin C. Harding March 30, 2017

March 30, 2017

Is it easier to review this change for correctness if it is three patches or one? TLDR; + struct wpa_key_t *key = &priv->wpa.key[index]; - memcpy(&priv->wpa.key[index].rx_seq[0], enc->rx_seq, IW_ENCODE_SEQ_MAX_SIZE); + memcpy(key->rx_seq, enc->rx_seq, IW_ENCODE_SEQ_MAX_SIZE); Brief description of steps: 1. Add local pointer variable, defined to correct memory location. 2. Use newly defined local variable where suitable. 3. Remove unnecessary address operator (reasoning specified below). Extended description of steps: 1. Add local variable (defined in one statement here for brevity) struct wpa_key_t *key = &priv->wpa.key[index]; 2. Use newly defined local variable where suitable. sample original code ... } else if (enc->ext_flags & IW_ENCODE_EXT_RX_SEQ_VALID) { memcpy(&priv->wpa.key[index].rx_seq[0], enc->rx_seq, IW_ENCODE_SEQ_MAX_SIZE); ... sample code after step 2: ... } else if (enc->ext_flags & IW_ENCODE_EXT_RX_SEQ_VALID) { memcpy(&key->rx_seq[0], enc->rx_seq, IW_ENCODE_SEQ_MAX_SIZE); ... Justification for step 3: In the above call to memcpy() taking the address of the initial element of the array adds no extra information to the call since the source variable is named identically and does not take the address of the first element. sample final state: ... } else if (enc->ext_flags & IW_ENCODE_EXT_RX_SEQ_VALID) { memcpy(key->rx_seq, enc->rx_seq, IW_ENCODE_SEQ_MAX_SIZE); ... thanks for taking the time to read. Tobin.

2 2

0 bit shift
by Tobin C. Harding March 30, 2017

March 30, 2017

What is the reason for the zero bit shift in this code please? #define SDIO_STATE_PRESENT (1<<0) /* present in sysfs */ file: include/linux/mmc/sdio_func.h thanks, Tobin.

2 2

where's the definition of trace_kfree_skb?
by Shiyao Ma March 28, 2017

March 28, 2017

Hi, I saw this function invocation, trace_kfree_skb(skb, __builtin_return_address(0)); so I grepped the source for "trace_kfree_skb", but I found no where it's defined. Where's the definition for it? Best, Shiyao.

4 4