[SCSI] ibmvfc: Fix soft lockup on resume

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This fixes a softlockup seen on resume. During resume, the CRQ
must be reenabled. However, the H_ENABLE_CRQ hcall used to do
this may return H_BUSY or H_LONG_BUSY. When this happens, the
caller is expected to retry later. Normally the H_ENABLE_CRQ
succeeds relatively soon. However, we have seen cases where
this can take long enough to see softlockup warnings.
This patch changes a simple loop, which was causing the
softlockup, to a loop at task level which sleeps between
retries rather than simply spinning.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

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Brian King 2010-06-17 13:55:13 -05:00 • committed by James Bottomley

parent 15f7fc060a

commit 73ee5d8672

2 changed files with 56 additions and 27 deletions

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81

drivers/scsi/ibmvscsi/ibmvfc.c

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2

drivers/scsi/ibmvscsi/ibmvfc.h

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