SRU request for LP#235889

Colin Ian King colin.king at
Mon Jun 23 06:15:15 UTC 2008

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:

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

Tested and verified OK by user from PPA kernel:

Patch attached

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