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dmaengine: idxd: Avoid unnecessary destruction of file_ida

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[ Upstream commit 76e43fa6a456787bad31b8d0daeabda27351a480 ]

file_ida is allocated during cdev open and is freed accordingly
during cdev release. This sequence is guaranteed by driver file
operations. Therefore, there is no need to destroy an already empty
file_ida when the WQ cdev is removed.

Worse, ida_free() in cdev release may happen after destruction of
file_ida per WQ cdev. This can lead to accessing an id in file_ida
after it has been destroyed, resulting in a kernel panic.

Remove ida_destroy(&file_ida) to address these issues.

Fixes: e6fd6d7e5f0f ("dmaengine: idxd: add a device to represent the file opened")
Signed-off-by: Lijun Pan <lijun.pan@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20240130013954.2024231-1-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fenghua Yu 2024-01-29 17:39:54 -08:00 committed by Greg Kroah-Hartman
parent 4ef5468e84
commit 9eb15f24a0
1 changed files with 0 additions and 1 deletions
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drivers/dma/idxd/cdev.c
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@ -577,7 +577,6 @@ void idxd_wq_del_cdev(struct idxd_wq *wq)
struct idxd_cdev *idxd_cdev;
idxd_cdev = wq->idxd_cdev;
ida_destroy(&file_ida);
wq->idxd_cdev = NULL;
cdev_device_del(&idxd_cdev->cdev, cdev_dev(idxd_cdev));
put_device(cdev_dev(idxd_cdev));