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dmaengine: idxd: fix retry value to be constant for duration of function call

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[ Upstream commit bc3452cdfc ]

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: 7930d85535 ("dmaengine: idxd: add knob for enqcmds retries")
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/165031760154.3658664.1983547716619266558.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dave Jiang 2022-04-18 14:33:21 -07:00 committed by Greg Kroah-Hartman
parent 12b5ce51a1
commit 18dd60b7a4
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/idxd/submit.c
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@ -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;
}