From: James Smart <jsmart2021@gmail.com>
To: linux-scsi@vger.kernel.org
Cc: James Smart <jsmart2021@gmail.com>,
Dick Kennedy <dick.kennedy@broadcom.com>
Subject: [PATCH 2/9] lpfc: Maintain atomic consistency of queue_claimed flag
Date: Fri, 1 May 2020 14:43:03 -0700 [thread overview]
Message-ID: <20200501214310.91713-3-jsmart2021@gmail.com> (raw)
In-Reply-To: <20200501214310.91713-1-jsmart2021@gmail.com>
A previous change introduced the atomic use of queue_claimed flag for
eq's and cq's. The code works fine, but the clearing of the
queue_claimed flag is not atomic.
Change queue_claimed = 0 into xchg(&queue_claimed, 0) to be consistent
for change under atomicity.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
drivers/scsi/lpfc/lpfc_sli.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index b6fb665e6ec4..9ce37560f4c0 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -538,7 +538,7 @@ lpfc_sli4_process_eq(struct lpfc_hba *phba, struct lpfc_queue *eq,
if (count > eq->EQ_max_eqe)
eq->EQ_max_eqe = count;
- eq->queue_claimed = 0;
+ xchg(&eq->queue_claimed, 0);
rearm_and_exit:
/* Always clear the EQ. */
@@ -13694,7 +13694,7 @@ __lpfc_sli4_process_cq(struct lpfc_hba *phba, struct lpfc_queue *cq,
"0369 No entry from completion queue "
"qid=%d\n", cq->queue_id);
- cq->queue_claimed = 0;
+ xchg(&cq->queue_claimed, 0);
rearm_and_exit:
phba->sli4_hba.sli4_write_cq_db(phba, cq, consumed,
--
2.26.1
next prev parent reply other threads:[~2020-05-01 21:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 21:43 [PATCH 0/9] lpfc: Update lpfc to revision 12.8.0.1 James Smart
2020-05-01 21:43 ` [PATCH 1/9] lpfc: Synchronize NVME transport and lpfc driver devloss_tmo James Smart
2020-05-03 14:42 ` James Smart
2020-05-07 9:11 ` Hannes Reinecke
2020-05-01 21:43 ` James Smart [this message]
2020-05-07 9:12 ` [PATCH 2/9] lpfc: Maintain atomic consistency of queue_claimed flag Hannes Reinecke
2020-05-01 21:43 ` [PATCH 3/9] lpfc: Remove re-binding of nvme rport during registration James Smart
2020-05-07 9:13 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 4/9] lpfc: Fix negation of else clause in lpfc_prep_node_fc4type James Smart
2020-05-07 9:14 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 5/9] lpfc: Change default queue allocation for reduced memory consumption James Smart
2020-05-07 9:49 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 6/9] lpfc: Remove unnecessary lockdep_assert_held calls James Smart
2020-05-07 9:50 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 7/9] lpfc: Fix noderef and address space warnings James Smart
2020-05-07 9:50 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 8/9] lpfc: Fix MDS Diagnostic Enablement definition James Smart
2020-05-07 9:50 ` Hannes Reinecke
2020-05-01 21:43 ` [PATCH 9/9] lpfc: Update lpfc version to 12.8.0.1 James Smart
2020-05-07 9:51 ` Hannes Reinecke
2020-05-08 2:54 ` [PATCH 0/9] lpfc: Update lpfc to revision 12.8.0.1 Martin K. Petersen
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