* [PATCH] dmaengine: idxd: fix abort status check
@ 2021-07-22 20:10 Dave Jiang
0 siblings, 0 replies; only message in thread
From: Dave Jiang @ 2021-07-22 20:10 UTC (permalink / raw)
To: vkoul; +Cc: Colin Ian King, dmaengine
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: 6b4b87f2c31a ("dmaengine: idxd: fix submission race window")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/dma/idxd/irq.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index 4e3a7198c0ca..78de2ac1520e 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -269,7 +269,11 @@ 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;
@@ -333,7 +337,11 @@ 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;
}
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