[PATCH 4.9 115/159] dmaengine: ioat: stop mod_timer from resurrecting deleted timer in __cleanup()

From: Greg Kroah-Hartman
Date: Mon Oct 24 2022 - 07:51:51 EST


From: Dave Jiang <dave.jiang@xxxxxxxxx>

[ 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>
---
drivers/dma/ioat/dma.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index c5a45c57b8b8..36189a3337b1 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -663,7 +663,7 @@ 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);
}

/* 5 microsecond delay per pending descriptor */
@@ -685,7 +685,7 @@ 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);
}
}
@@ -877,7 +877,7 @@ 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);
}

void ioat_timer_event(unsigned long data)
--
2.35.1