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-   -   SRU request for LP#235889 (http://www.linux-archive.org/ubuntu-kernel-team/111708-sru-request-lp-235889-a.html)

Colin Ian King 06-23-2008 06:15 AM

SRU request for LP#235889
 
´╗┐https://bugs.launchpad.net/ubuntu/+source/linux/+bug/235889

SRU justification:

Impact: When starting up the Areca 1220 PCIe card webconfig tool the
system locks up with:

BUG: scheduling while atomic: archhttp64/7146/0x1000000001
BUG: soft lockup - CPU#0 stuck for 11s! [archhttp64:7146]
BUG: soft lockup - CPU#0 stuck for 11s! [archhttp64:7146]

Fix: Softlockup is caused by arcmsr_iop_message_xfer() being
called from atomic context under the queuecommand scsi_host_template
handler. The current GFP_KERNEL|GFP_DMA flags are wrong: firstly we are
in atomic context, secondly this memory is not used for DMA. The patch
attached corrects these issues.

Patch from upstream commit:
69e562c234440fb7410877b5b24f4b29ef8521d1

Testcase: Starting up Areca card with webconfig tool, system will lockup
without the patch.

Tested and verified OK by user from PPA kernel:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/235889/comments/22

Patch attached

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Tim Gardner 06-23-2008 12:41 PM

SRU request for LP#235889
 
Colin Ian King wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/235889
>
> SRU justification:
>
> Impact: When starting up the Areca 1220 PCIe card webconfig tool the
> system locks up with:
>
> BUG: scheduling while atomic: archhttp64/7146/0x1000000001
> BUG: soft lockup - CPU#0 stuck for 11s! [archhttp64:7146]
> BUG: soft lockup - CPU#0 stuck for 11s! [archhttp64:7146]
>
> Fix: Softlockup is caused by arcmsr_iop_message_xfer() being
> called from atomic context under the queuecommand scsi_host_template
> handler. The current GFP_KERNEL|GFP_DMA flags are wrong: firstly we are
> in atomic context, secondly this memory is not used for DMA. The patch
> attached corrects these issues.
>
> Patch from upstream commit:
> 69e562c234440fb7410877b5b24f4b29ef8521d1
>
> Testcase: Starting up Areca card with webconfig tool, system will lockup
> without the patch.
>
> Tested and verified OK by user from PPA kernel:
>
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/235889/comments/22
>
> Patch attached
>
>

ACK

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Tim Gardner tim.gardner@ubuntu.com

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