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dmaengine: idxd: fix abort status check

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Coverity static analysis of linux-next found issue.

The check (status == IDXD_COMP_DESC_ABORT) is always false since status
was previously masked with 0x7f and IDXD_COMP_DESC_ABORT is 0xff.

Fixes: 6b4b87f2c3 ("dmaengine: idxd: fix submission race window")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162698465160.3560828.18173186265683415384.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2021-07-22 13:10:51 -07:00 committed by Vinod Koul
parent 125d10373a
commit b60bb6e2bf
1 changed files with 10 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/dma/idxd/irq.c
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@ -194,7 +194,11 @@ static int irq_process_pending_llist(struct idxd_irq_entry *irq_entry,
u8 status = desc->completion->status & DSA_COMP_STATUS_MASK;
if (status) {
if (unlikely(status == IDXD_COMP_DESC_ABORT)) {
/*
* Check against the original status as ABORT is software defined
* and 0xff, which DSA_COMP_STATUS_MASK can mask out.
*/
if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) {
complete_desc(desc, IDXD_COMPLETE_ABORT);
(*processed)++;
continue;
@ -250,7 +254,11 @@ static int irq_process_work_list(struct idxd_irq_entry *irq_entry,
list_for_each_entry(desc, &flist, list) {
u8 status = desc->completion->status & DSA_COMP_STATUS_MASK;
if (unlikely(status == IDXD_COMP_DESC_ABORT)) {
/*
* Check against the original status as ABORT is software defined
* and 0xff, which DSA_COMP_STATUS_MASK can mask out.
*/
if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) {
complete_desc(desc, IDXD_COMPLETE_ABORT);
continue;
}