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dmaengine: ioat: adding missed issue_pending to timeout handler 

completion timeout might trigger unnesesery DMA engine hw reboot
in case of missed issue_pending() .

Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com>
Link: https://lore.kernel.org/r/1587589761-32690-3-git-send-email-leonid.ravich@dell.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Leonid Ravich 2020-04-23 00:09:18 +03:00 committed by Vinod Koul
parent 2baedcb6a6
commit db474931df
1 changed files with 9 additions and 0 deletions
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9
drivers/dma/ioat/dma.c
View File

@ -955,6 +955,15 @@ void ioat_timer_event(struct timer_list *t)
goto unlock_out;
}
/* handle missed issue pending case */
if (ioat_ring_pending(ioat_chan)) {
dev_warn(to_dev(ioat_chan),
"Completion timeout with pending descriptors\n");
spin_lock_bh(&ioat_chan->prep_lock);
__ioat_issue_pending(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}
set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
unlock_out: