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From a2a17519c122440d7f2bbb5d7869d3d0b87f3376 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 9 May 2025 08:03:04 +0800
Subject: dmaengine: idxd: Check availability of workqueue allocated by idxd wq
driver before using
From: Yi Sun <yi.sun@intel.com>
[ 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>
---
drivers/dma/idxd/cdev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 7e3a67f9f0a65..aa39fcd389a94 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -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);
}
--
2.39.5
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