This is a note to let you know that I've just added the patch titled
dmaengine: ioat: stop mod_timer from resurrecting deleted timer in __cleanup()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-ioat-stop-mod_timer-from-resurrecting-dele.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6e5dbef048a1b4e682849fe47e6cf44eccea3166
Author: Dave Jiang <dave.jiang@xxxxxxxxx>
Date: Mon Sep 19 09:58:42 2022 -0700
dmaengine: ioat: stop mod_timer from resurrecting deleted timer in __cleanup()
[ Upstream commit 898ec89dbb55b8294695ad71694a0684e62b2a73 ]
User reports observing timer event report channel halted but no error
observed in CHANERR register. The driver finished self-test and released
channel resources. Debug shows that __cleanup() can call
mod_timer() after the timer has been deleted and thus resurrect the
timer. While harmless, it causes suprious error message to be emitted.
Use mod_timer_pending() call to prevent deleted timer from being
resurrected.
Fixes: 3372de5813e4 ("dmaengine: ioatdma: removal of dma_v3.c and relevant ioat3 references")
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Link: https://lore.kernel.org/r/166360672197.3851724.17040290563764838369.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 37ff4ec7db76..e2070df6cad2 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -656,7 +656,7 @@ static void __cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete)
if (active - i == 0) {
dev_dbg(to_dev(ioat_chan), "%s: cancel completion timeout\n",
__func__);
- mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
}
/* microsecond delay by sysfs variable per pending descriptor */
@@ -682,7 +682,7 @@ static void ioat_cleanup(struct ioatdma_chan *ioat_chan)
if (chanerr &
(IOAT_CHANERR_HANDLE_MASK | IOAT_CHANERR_RECOVER_MASK)) {
- mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
ioat_eh(ioat_chan);
}
}
@@ -879,7 +879,7 @@ static void check_active(struct ioatdma_chan *ioat_chan)
}
if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
- mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
+ mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
}
static void ioat_reboot_chan(struct ioatdma_chan *ioat_chan)
