* [PATCH] dmaengine: idxd: fix retry value to be constant for duration of function call
@ 2022-04-18 21:33 Dave Jiang
2022-04-20 10:34 ` Vinod Koul
0 siblings, 1 reply; 2+ messages in thread
From: Dave Jiang @ 2022-04-18 21:33 UTC (permalink / raw)
To: vkoul; +Cc: Dave Hansen, dmaengine
When retries is compared to wq->enqcmds_retries each loop of idxd_enqcmds(),
wq->enqcmds_retries can potentially changed by user. Assign the value
of retries to wq->enqcmds_retries during initialization so it is the
original value set when entering the function.
Fixes: 7930d8553575 ("dmaengine: idxd: add knob for enqcmds retries")
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/dma/idxd/submit.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 554b0602d2e9..c01db23e3333 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -150,7 +150,7 @@ static void llist_abort_desc(struct idxd_wq *wq, struct idxd_irq_entry *ie,
*/
int idxd_enqcmds(struct idxd_wq *wq, void __iomem *portal, const void *desc)
{
- unsigned int retries = 0;
+ unsigned int retries = wq->enqcmds_retries;
int rc;
do {
@@ -158,7 +158,7 @@ int idxd_enqcmds(struct idxd_wq *wq, void __iomem *portal, const void *desc)
if (rc == 0)
break;
cpu_relax();
- } while (retries++ < wq->enqcmds_retries);
+ } while (retries--);
return rc;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] dmaengine: idxd: fix retry value to be constant for duration of function call
2022-04-18 21:33 [PATCH] dmaengine: idxd: fix retry value to be constant for duration of function call Dave Jiang
@ 2022-04-20 10:34 ` Vinod Koul
0 siblings, 0 replies; 2+ messages in thread
From: Vinod Koul @ 2022-04-20 10:34 UTC (permalink / raw)
To: Dave Jiang; +Cc: Dave Hansen, dmaengine
On 18-04-22, 14:33, Dave Jiang wrote:
> When retries is compared to wq->enqcmds_retries each loop of idxd_enqcmds(),
> wq->enqcmds_retries can potentially changed by user. Assign the value
> of retries to wq->enqcmds_retries during initialization so it is the
> original value set when entering the function.
Applied, thanks
--
~Vinod
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-04-18 21:33 [PATCH] dmaengine: idxd: fix retry value to be constant for duration of function call Dave Jiang
2022-04-20 10:34 ` Vinod Koul
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