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dmaengine: idxd: Check availability of workqueue allocated by idxd wq driver before using

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[ Upstream commit 17502e7d7b7113346296f6758324798d536c31fd ]

Running IDXD workloads in a container with the /dev directory mounted can
trigger a call trace or even a kernel panic when the parent process of the
container is terminated.

This issue occurs because, under certain configurations, Docker does not
properly propagate the mount replica back to the original mount point.

In this case, when the user driver detaches, the WQ is destroyed but it
still calls destroy_workqueue() attempting to completes all pending work.
It's necessary to check wq->wq and skip the drain if it no longer exists.

Signed-off-by: Yi Sun <yi.sun@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>

Link: https://lore.kernel.org/r/20250509000304.1402863-1-yi.sun@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yi Sun
2025-05-09 08:03:04 +08:00
committed by Greg Kroah-Hartman
parent c765f592ad
commit e0051a3daa
1 changed files with 3 additions and 1 deletions
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4
drivers/dma/idxd/cdev.c
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@@ -354,7 +354,9 @@ static void idxd_cdev_evl_drain_pasid(struct idxd_wq *wq, u32 pasid)
set_bit(h, evl->bmap);
h = (h + 1) % size;
}
drain_workqueue(wq->wq);
if (wq->wq)
drain_workqueue(wq->wq);
mutex_unlock(&evl->lock);
}