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Stop usbhid from claiming usb device on hotplug
by Armin Moradi June 1, 2015

June 1, 2015

Hi all, I'm writing a kernel module, but probe() is never called since usbhid claims the usb device as soon as the device is plugged in. Tried/potential solutions: #1: I have tried to write the usb hid id to /sys/bus/usb/drivers/usbhid/unbind (e.g. echo "1-1.1:1.4" > /sys/bus/usb/drivers/usbhid/unbind) and that properly unbinds the device from usbhid, but I want my module to claim the device when it's plugged in. Adding the above command to udev didn't do much as I couldn't find a way to tell my module to claim it as it was plugged in. It seems to me that usbhid claims the device, then udev rule unbinds it, but since usbhid already claimed it at plugin, my module's probe() wasn't called regardless. #2: I also tried unloading usbhid and loading my module and *then* usbhid. When the device was plugged in, usbhid still took over and my module's probe() still wasn't called. Even if that worked, it wouldn't feel like a proper solution. #3: I could potentially blacklist the device in drivers sources, but that doesn't seem a good option because I may want to have usbhid manage the device at some point At this point, I have no idea what else I could try! Any help or direction would be appreciated. Thanks.

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Packet encryption based on gre key value with ip xfrm command
by Harsh Jain May 31, 2015

May 31, 2015

Hi, I am trying to encrypt Gre packet have specific key values in GRE header with following command ip xfrm policy add src 192.168.1.9 dst 192.168.1.5 proto gre key 3 dir in tmpl src 192.168.1.9 dst 192.168.1.5 proto esp reqid 16387 mode transport But it is not working. If I remove the "key 3" from above system encrypt all GRE packets. I tried with kernel version 3.18 and iproute2 version.2.4. I got iproute2 patch file having changes to support filtering based on keys but didn't find corresponding kernel patch. How to encrypt Packets based on GRE key value.? Regards Harsh Jain

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Query on device tree phandles
by victorascroft＠gmail.com May 28, 2015

May 28, 2015

Hello, I have a query related to device tree. If I have three nodes as below node1: node1@addr1 { compatible ="name1", "syscon"; } node2: node1@addr2 { compatible ="name2", "syscon"; } node3: node1@addr3 { compatible ="name3", "syscon"; } At the top soc node, I define phandles as follows node-phandle1 = <&node1 0x10> node-phandle2 = <&node2 0x20> node-phandle3 = <&node3 0x30> How can I read the values of 0x10, 0x20 and 0x30 while using the node-phandlex property? Is it possible using one of the of_* functions? The driver binds to one of the syscon nodes above lets say node3. Regards, Victor.

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Will make modules_install replace old kernel modules?
by Gao Peng May 28, 2015

May 28, 2015

I built kernel in this sequence make make modules sudo make modules_install sudo make install I am not sure if I boot from the old kernel,will the old kernel load the new-installed modules or keep it's own modules？

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physical memory userspace/kernel split on Linux x86-64
by Le Tan May 28, 2015

May 28, 2015

Hi, Is there an explict split between userspace and kernel in physical memory on Linux x86-64? That is, given a physical address, can I tell whether this address is from userspace or not? As far as I know, in virtual address space, the kernel will use the upper half and the userspace will use the lower half. But what about in physical address space? Thanks very much! Le

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wake_up_interruptible in ISR
by Chan Kim May 27, 2015

May 27, 2015

Hello, I see in the source (linux ver 3.3) that wake_up_interruptible function doesn't sleep so I used in it an ISR but I'm getting 'BUG:scheduling while atomic' message. (I'm not sure it's coming from this) I'm looking for the exact cause but Is there any caveat when using wake_up_interruptible() in an ISR? (I found some drivers use it in ISR, some use it in work_struct) I also read in http://www.slideshare.net/rampalliraj/tasklet-vs-work-queues?from_action=sa… that tasklet is not allowed to sleep but work is. (because tasklet is not in process context, but in bottom-half) I don't know if I have to move my wake_up_interruptible function to tasklet or work(queue) or even it matters to the current problem. Any tip will be appreciated. Regards, Chan

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To use wake_up_interruptible in ISR
by 김찬 May 27, 2015

May 27, 2015

Hello, I see in the source (linux ver 3.3) that wake_up_interruptible function doesn't sleep so I used in it an ISR but I'm getting 'BUG:scheduling while atomic' message. (I'm not sure it's coming from this) I'm looking for the exact cause but Is there any caveat when using wake_up_interruptible() in an ISR? (I found some drivers use it in ISR, some use it in work_struct) I also read in http://www.slideshare.net/rampalliraj/tasklet-vs-work-queues?from_action=sa… that tasklet is not allowed to sleep but work is. (because tasklet is not in process context, but in bottom-half) I don't know if I have to move the wake_up_interruptible function to tasklet or work(queue) or even it matters to the current problem. Any help would be greatly appreciated. Regards, Chan

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SynProxy can not return syn ack packets with asymmetric dual bridge topology
by Niyazi Sırt May 26, 2015

May 26, 2015

Hello all, I have a asymmetric dual bridge topology as shown below when i connect from 172.16.11.5 and 172.16.10.6 with ssh but i can not connect because of SynProxy. ------- | | ---o--- 172.16.11.5 | | -----o----- 172.16.11.6 | | | | default gw 1.1.1.1 | | 1.1.1.2/30 --o----o--- 2.2.2.2/30 | | | | | | (enp10s0f0) ----o----o----- | | | XXX | | | | br1 br0 | synproxy | | ----o----o----- | | | | | | 1.1.1.1/30 --o----o--- 2.2.2.1/30 | | | | default gw 2.2.2.2 | | -----o----- 172.16.10.1 | | ---o--- 172.16.10.6 | | ------- On all machines between 172.16.11.5 and 172.16.10.6 "rp filtering" is off and "ip forwarding" is on. There is a machine at the middle of topology which is called "XXX" machine. XXX has two bridges and a SynProxy. When SynProxy is turned OFF on XXX, I can ping from 172.16.11.5 to 172.16.10.6 and icmp packets follow this path: br1->172.16.10.1->172.16.10.6->172.16.10.1->br0. In addition, I can access from 172.16.11.5 to 172.16.10.6 with ssh. So the TCP traffic works as I expect. However, when SynProxy is turned ON on XXX, I can ping from 172.16.11.5 to 172.16.10.6 and icmp packets follow the same path. But I can not access from 172.16.11.5 to 172.16.10.6 using ssh. This is because synproxy can not send syn ack replies through br1 iface. If I add a route for synack packets on XXX, i can connect from 172.16.11.5 to 172.16.10.6 with ssh. route add 172.16.11.5 dev enp10s0f0 But this is not acceptable because 172.16.11.0 network is cloud. So i could not add route all cloud network to route table and could not add mac address to arp table. How can I connect from 172.16.11.5 to the 172.16.10.6 machine using ssh when SynProxy is turned ON on XXX? oris It possible? Thanks in advance, Niyazi

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How to install a older version kernel on new OS?
by Gao Peng May 22, 2015

May 22, 2015

I am using fedora 21,and kernel version is 3.17 but I compile a 2.6.32 kernel and install it,when I reboot I got error :"too old kernel",how Can I install a rather older kernel on a new system,is there some way fix it?

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when I subscribe linux-kernel mailing list , There is not any resposes! Why?
by sizel May 20, 2015

May 20, 2015

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