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[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>
This commit is contained in:
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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2
drivers/scsi/ibmvscsi/ibmvfc.h
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@@ -649,6 +649,8 @@ struct ibmvfc_event_pool {
enum ibmvfc_host_action {
IBMVFC_HOST_ACTION_NONE = 0,
IBMVFC_HOST_ACTION_RESET,
IBMVFC_HOST_ACTION_REENABLE,
IBMVFC_HOST_ACTION_LOGO,
IBMVFC_HOST_ACTION_LOGO_WAIT,
IBMVFC_HOST_ACTION_INIT,