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scsi: lpfc: Rework locking on SCSI io completion

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A scsi host lock is taken on every io completion to check whether the abort
handler is waiting on the io completion. This is an expensive lock to take
on all completion when rarely in an abort condition.

Replace scsi host lock with command-specific lock. Synchronize completion
and abort paths by new cmd lock. Ensure all flag changing and nulling of
context pointers taken under lock.  When adding lock to task management
abort, realized it was missing other synchronization locks. Added that
synchronization to match normal paths.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart
2019-01-28 11:14:37 -08:00
committed by Martin K. Petersen
parent b1684a0b42
commit c2017260ee
5 changed files with 112 additions and 74 deletions
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1
drivers/scsi/lpfc/lpfc_init.c
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@@ -4160,6 +4160,7 @@ lpfc_new_io_buf(struct lpfc_hba *phba, int num_to_alloc)
lpfc_ncmd->dma_sgl = lpfc_ncmd->data;
lpfc_ncmd->dma_phys_sgl = lpfc_ncmd->dma_handle;
lpfc_ncmd->cur_iocbq.context1 = lpfc_ncmd;
spin_lock_init(&lpfc_ncmd->buf_lock);
/* add the nvme buffer to a post list */
list_add_tail(&lpfc_ncmd->list, &post_nblist);