August 2014 - kernelnewbies@kernelnewbies.org

Re: Build Error in Linux-next, intel ethernet driver
by Lucas Tanure Aug. 5, 2014

Aug. 5, 2014

I updated my clean untouched linux-next tree, and tried to compile with the attached .config. But I got a build error with intel i40e driver. I tested a fix, and sent to LKML. But I don't have this device, I compiled and tested the kernel. Boots normally. Anyone had the same issue ? Thanks Lucas Tanure Fix missing include in intel i40e driver. Without this include linux next tree won't compile. Signed-off-by: Lucas Tanure <tanure(a)linux.com> --- drivers/net/ethernet/intel/i40e/i40e_fcoe.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_fcoe.c b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c index 6938fc1..5d01db1 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_fcoe.c +++ b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c @@ -33,6 +33,7 @@ #include <scsi/fc/fc_fcoe.h> #include <scsi/libfc.h> #include <scsi/libfcoe.h> +#include <uapi/linux/dcbnl.h> #include "i40e.h" #include "i40e_fcoe.h" -- 2.0.0

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Bad Patches and Issues with other devolopers
by Nick Krause Aug. 5, 2014

Aug. 5, 2014

I have sent out just ten bad patches and the developers seem very annoyed with me and think I am trolling. If someone on this list can find a way for me to improve my relationship with them and let me continue my work here that would be great. Nick

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Trace Help
by Nick Krause Aug. 5, 2014

Aug. 5, 2014

I am tracing this , Aug 4 10:20:03 Horos kernel: ------------[ cut here ]------------ Aug 4 10:20:03 Horos kernel: WARNING: CPU: 3 PID: 31 at net/wireless/reg.c:1806 reg_process_hint+0x286/0x330 [cfg80211]() Aug 4 10:20:03 Horos kernel: Modules linked in: af_packet snd_pcm_oss snd_mixer_oss nls_iso8859_1 nls_cp850 vfat fat snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi arc4 evdev ath9k ath9k_common ath9k_hw ath psmouse led_class mac80211 k10temp cfg80211 rfkill sr_mod r8169 cdrom mii 8250 serial_core snd_hda_intel snd_hda_controller snd_hda_codec radeon snd_pcm drm_kms_helper button snd_timer ttm processor snd wmi soundcore drm i2c_piix4 i2c_algo_bit i2c_core Aug 4 10:20:03 Horos kernel: CPU: 3 PID: 31 Comm: kworker/3:1 Not tainted 3.16.0-00115-g19583ca #58 Aug 4 10:20:03 Horos kernel: Hardware name: System manufacturer System Product Name/F2A85-M LE, BIOS 5012 08/28/2012 Aug 4 10:20:03 Horos kernel: Workqueue: events reg_todo [cfg80211] Aug 4 10:20:03 Horos kernel: 0000000000000000 ffff880237437d50 ffffffff8134fc09 0000000000000000 Aug 4 10:20:03 Horos kernel: ffff880237437d88 ffffffff81036e05 ffffffffa032dc4b ffff880235677500 Aug 4 10:20:03 Horos kernel: ffff880235ac4240 0000000000000003 ffff88023567751c ffff880237437d98 Aug 4 10:20:03 Horos kernel: Call Trace: Aug 4 10:20:03 Horos kernel: [<ffffffff8134fc09>] dump_stack+0x4d/0x6f Aug 4 10:20:03 Horos kernel: [<ffffffff81036e05>] warn_slowpath_common+0x75/0x8e Aug 4 10:20:03 Horos kernel: [<ffffffffa032dc4b>] ? reg_process_hint+0x286/0x330 [cfg80211] Aug 4 10:20:03 Horos kernel: [<ffffffff81036ec2>] warn_slowpath_null+0x15/0x17 Aug 4 10:20:03 Horos kernel: [<ffffffffa032dc4b>] reg_process_hint+0x286/0x330 [cfg80211] Aug 4 10:20:03 Horos kernel: [<ffffffffa032dd70>] reg_todo+0x7b/0x157 [cfg80211] Aug 4 10:20:03 Horos kernel: [<ffffffff81048e92>] process_one_work+0x1ba/0x2d6 Aug 4 10:20:03 Horos kernel: [<ffffffff81049adb>] worker_thread+0x308/0x3f5 Aug 4 10:20:03 Horos kernel: [<ffffffff810497d3>] ? cancel_delayed_work_sync+0x10/ 0x10 Aug 4 10:20:03 Horos kernel: [<ffffffff8104e13e>] kthread+0xdf/0xe7 Aug 4 10:20:03 Horos kernel: [<ffffffff8104e05f>] ? kthread_create_on_node+0x17b/0x17b Aug 4 10:20:03 Horos kernel: [<ffffffff81353eec>] ret_from_fork+0x7c/0xb0 Aug 4 10:20:03 Horos kernel: [<ffffffff8104e05f>] ? kthread_create_on_node+0x17b/0x17b Aug 4 10:20:03 Horos kernel: ---[ end trace 389490cbf61b0b3c ]--- My logic is this, I am assuming I am wrong again based on my bad patches record. 1. In reg_redo we are calling reg_process_prending_hints with rtnl_lock on this wireless driver 2. In that function we known there are two calls to reg_process_hint and we hit both so therefore, we are traced to that function as also if (lr && !lr->processed) is true in the function we are in 3. In that function we hit the warn on with no default initialization and free the it in the function reg_free_request 4. And since this this is the last request free here and also since this a null value we hit the warn on for null as there is no set function we can use, the request being null 5.We then free the value as this is the last request in reg_free_request based on the if statement and we call reg_process_hint and we have already freed the request leading to the kernel panic Nick

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Network driver ( dma, iomem.. )
by Oscar Salvador Aug. 5, 2014

Aug. 5, 2014

Hi People!, How are you doing? I write to you because I'm writing a driver for a Realtek8139D 10/100Mbps, just for fun and for practice my knowledge. I spent some time reading about PCI specifications, but I have some doubts about that: 1- I/O Port or I/O memory mapping ( RTL8139 has BAR0 for I/O PORT and BAR1 for I/O Memory ) * I've read about the diferences, and since I understood, the best way to do is with memory mapping. I/O PORT has some limitations like limited instructions can be used. Do you know more about that? More diferences? 2- DMA and memory region * When I request for the I/O memory region of pci device: memr_start = pci_resource_start(dev, IO_MEM); memr_end = pci_resource_end(dev, IO_MEM); The memr_start is the address for reach the device and send data to him? * I've seen that pci_bus_master is supported by RTL8139D: pci_set_master(dev); pci_read_config_word(dev, 0x4, &is_master); pr_info("PCI_BUS_MASTER: %d\n", is_master); it returns 111b, so it can be enabled. Then I think I should call pci_alloc_consistent() to take a DMA address. This DMA address is the address of the BUS (where device is). This should be the address that I have to use for incoming/outgoing data from/to the device? I'm a little bit stuck in these terms Could you help me? Best Regards Oscar

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Build Error in Linux-next, intel ethernet driver
by Lucas Tanure Aug. 5, 2014

Aug. 5, 2014

I updated my clean untouched linux-next tree, and tried to compile with the attached .config. But I got a build error with intel i40e driver. I tested a fix, and sent to LKML. But I don't have this device, I compiled and tested the kernel. Boots normally. Anyone had the same issue ? Thanks Lucas Tanure Fix missing include in intel i40e driver. Without this include linux next tree won't compile. Signed-off-by: Lucas Tanure <tanure(a)linux.com> --- drivers/net/ethernet/intel/i40e/i40e_fcoe.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_fcoe.c b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c index 6938fc1..5d01db1 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_fcoe.c +++ b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c @@ -33,6 +33,7 @@ #include <scsi/fc/fc_fcoe.h> #include <scsi/libfc.h> #include <scsi/libfcoe.h> +#include <uapi/linux/dcbnl.h> #include "i40e.h" #include "i40e_fcoe.h" -- 2.0.0

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PCIe AER on kernel 3.0.4 with aer-inject
by lunmin.liang＠freescale.com Aug. 5, 2014

Aug. 5, 2014

Hi, all Here are two questions about PCIe AER on kernel 3.0.4 1. Where to find aer-inject, the link is empty https://www.kernel.org/pub/linux/utils/pci/aer-inject/ 2. How to check whether the PCIe AER is supported on kernel 3.0.4 on a specified platform, say p2020 Thank you for your help! Regards Lunmin Liang 梁伦敏

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Configure git send mail for yahoo email
by Anand Moon Aug. 5, 2014

Aug. 5, 2014

Hi All, Could some one guide me how to configure .gitconfig I have tried following commands. git config --global sendemail.smtpserver smtp.mail.yahoo.com git config --global sendemail.smtpserverport 4100 git config --global sendemail.smtpencryption ssl git config --global sendemail.smtpuser moon.linux(a)yahoo.com git config --global sendemail.confirm auto But I get following error: Unable to initialize SMTP properly. Check config and use --smtp-debug. -Anand Moon

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Help with btrfs_zero_range function
by Nick Krause Aug. 4, 2014

Aug. 4, 2014

Hey Guys, I am wondering how to convert btrfs_find_first_hole and btrfs_fill_holes in order to support zero range for btrfs in order to support fallocate zero range. I am pasting my code so far and please let me known if there is something else I am missing. The function is called btrfs_zero_range in the file I am attaching. Regards Nick

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Porting PCi driver from 2.6.32 to 3.x kernel version
by Omkar Houddin Aug. 4, 2014

Aug. 4, 2014

Hi, Im trying to port a PCI Driver from 2.6.32 to 3.11.6-4-desktop kernel verion. I tried to update the driver source to compile correctly and load fine. But when I'm trying to send command some thing like a soft reset which re intializes the configuration table. and at that point of time the I'm getting different value than what I used to get on 2.6.32 kernel version. *3.11.6.4 Kernel verison:* scull_ioctl: SCULL_SOFT_RESET 2014-08-04T08:06:24.839008-07:00 kernel: [ 2065.546754] calling softReset... 2014-08-04T08:06:24.839009-07:00 kernel: [ 2065.546756] softReset: start *2014-08-04T08:06:24.839010-07:00 kernel: [ 2065.546782] msgu_write: Scratchpad(MSGU) regValue=0xfffd addr=0xf7ea1000* *2014-08-04T08:06:24.839010-07:00 kernel: [ 2065.546784] msgu_write: Scratchpad(MSGU) regValue=0xffffffff addr=0xf7ea1000* *2014-08-04T08:06:25.140002-07:00 kernel: [ 2065.847646] SoftReset: Soft Reset Register's value is 0xffffffff (bits bits [7:6] are not b01)* where as before i.e is in 2.6.32 scull_ioctl: SCULL_SOFT_RESET *Aug 4 16:39:22 kernel: [53428.498546] calling softReset...* *Aug 4 16:39:22 kernel: [53428.498552] softReset: start* *Aug 4 16:39:22 kernel: [53428.797878] I2O: Scratchpad1 data=0x40 addr=0x48* *Aug 4 16:39:23 kernel: [53429.533163] I2O: Scratchpad0 data=0x40002000 addr=0xf7ee0044* *Aug 4 16:39:23 kernel: [53429.533176] bar_num=0x10 cfg_offset=0x2000* *Aug 4 16:39:23 kernel: [53429.533183] scull_cfg_table = f7ee2000* *Aug 4 16:39:23 kernel: [53429.533190] I2O: Scratchpad1(MSGU) data=0x3c0f addr=0xf7ee0048* *Aug 4 16:39:23 kernel: [53429.533198] I2O: Scratchpad2(IOP) data=0x0 addr=0xf7ee004c* *Aug 4 16:39:23 kernel: [53429.533205] I2O: Scratchpad3(IOP) data=0x30004003 addr=0xf7ee0050* *Aug 4 16:39:23 kernel: [53429.533213] Write SCULL Config Table* the function I used for register read is: *unsigned int msgu_reg_read(unsigned int msgu_reg_offset)* *{* * unsigned int addr;* * unsigned int data;* * addr = i2o_addr + msgu_reg_offset;* * data = readl((void *)addr);* * return data;* *}* Could anyone please help me how to solve this issue? Thank you, Regards, OH.

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Where is the source code of udev?
by Julio Faracco Aug. 4, 2014

Aug. 4, 2014

Hi everybody. Where can I find the updated source code of udev? I'm cloning the source from here: http://git.kernel.org/cgit/linux/hotplug/udev.git/ Is it right? Thanks! -- *Julio Cesar Faracco*

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