[5.15,348/530] dmaengine: ioat: stop mod_timer from resurrecting deleted timer in __cleanup()
Commit Message
Greg KH
Oct. 24, 2022, 11:31 a.m. UTC
From: Dave Jiang <dave.jiang@intel.com> [ 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@intel.com> Link: https://lore.kernel.org/r/166360672197.3851724.17040290563764838369.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 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)