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cxlflash: Fix to prevent stale AFU RRQ 

Following an adapter reset, the AFU RRQ that resides in host memory
holds stale data. This can lead to a condition where the RRQ interrupt
handler tries to process stale entries and/or endlessly loops due to an
out of sync generation bit.

To fix, the AFU RRQ in host memory needs to be cleared after each reset.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Matthew R. Ochs 2015-10-21 15:15:14 -05:00 committed by James Bottomley
parent f15fbf8d4e
commit af10483e5e
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/cxlflash/main.c
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@ -1598,6 +1598,9 @@ static int start_afu(struct cxlflash_cfg *cfg)
init_pcr(cfg);
/* After an AFU reset, RRQ entries are stale, clear them */
memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry));
/* Initialize RRQ pointers */
afu->hrrq_start = &afu->rrq_entry[0];
afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1];