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dmaengine: idxd: fix resource leak on dmaengine driver disable 

commit a3e340c157 upstream.

The wq resources needs to be released before the kernel type is reset by
__drv_disable_wq(). With dma channels unregistered and wq quiesced, all the
wq resources for dmaengine can be freed. There is no need to wait until wq
is disabled. With the wq->type being reset to "unknown", the driver is
skipping the freeing of the resources.

Fixes: 0cda4f6986 ("dmaengine: idxd: create dmaengine driver for wq 'device'")
Reported-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Tested-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/163517405099.3484556.12521975053711345244.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Chen Zhuo <sagazchen@tencent.com>
Signed-off-by: Xinghui Li <korantli@tencent.com>
This commit is contained in:
Dave Jiang 2021-10-25 08:01:04 -07:00 committed by Jianping Liu
parent f94e4f26bc
commit 6a0cb77f14
1 changed files with 1 additions and 2 deletions
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3
drivers/dma/idxd/dma.c
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@ -329,10 +329,9 @@ static void idxd_dmaengine_drv_remove(struct idxd_dev *idxd_dev)
mutex_lock(&wq->wq_lock);
idxd_wq_quiesce(wq);
idxd_unregister_dma_channel(wq);
idxd_wq_free_resources(wq);
__drv_disable_wq(wq);
percpu_ref_exit(&wq->wq_active);
idxd_wq_free_resources(wq);
wq->type = IDXD_WQT_NONE;
mutex_unlock(&wq->wq_lock);
}