From b60bb6e2bfc192091b8f792781b83b5e0f9324f6 Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Thu, 22 Jul 2021 13:10:51 -0700
Subject: [PATCH] dmaengine: idxd: fix abort status check
Git-commit: b60bb6e2bfc192091b8f792781b83b5e0f9324f6
Patch-mainline: v5.15-rc1
References: git-fixes stable-5.14.8
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>
Link: https://lore.kernel.org/r/162698465160.3560828.18173186265683415384.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 e018459b534f..65dc7bbb0a13 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -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;
}
--
2.26.2