[PATCH v2] dmaengine: idxd: fix resource leak on dmaengine driver disable

[Dave Jiang <dave.jiang@intel.com>]

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: 0cda4f6986a3 ("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>
---

v2: rebase against latest dmaengine/next

 drivers/dma/idxd/dma.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index b90b085d18cf..c39e9483206a 100644
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -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);
 }