[PATCH] dmaengine: idxd: fix cdev locking for open and release

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

From: Nikhil Rao <nikhil.rao@intel.com>

add the wq lock in cdev open and release call. This fixes
race conditions observed in the open and close routines.

Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland")

Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/dma/idxd/cdev.c |   23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index ff49847e37a8..207555296913 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -74,6 +74,7 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp)
 	struct idxd_device *idxd;
 	struct idxd_wq *wq;
 	struct device *dev;
+	int rc;
 
 	wq = inode_wq(inode);
 	idxd = wq->idxd;
@@ -81,17 +82,29 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp)
 
 	dev_dbg(dev, "%s called: %d\n", __func__, idxd_wq_refcount(wq));
 
-	if (idxd_wq_refcount(wq) > 0 && wq_dedicated(wq))
-		return -EBUSY;
+	mutex_lock(&wq->wq_lock);
+
+	if (idxd_wq_refcount(wq) > 0 && wq_dedicated(wq)) {
+		rc = -EBUSY;
+		goto failed;
+	}
 
 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
+	if (!ctx) {
+		rc = -ENOMEM;
+		goto failed;
+	}
 
 	ctx->wq = wq;
 	filp->private_data = ctx;
 	idxd_wq_get(wq);
+	mutex_unlock(&wq->wq_lock);
 	return 0;
+
+ failed:
+	mutex_unlock(&wq->wq_lock);
+	kfree(ctx);
+	return rc;
 }
 
 static int idxd_cdev_release(struct inode *node, struct file *filep)
@@ -105,7 +118,9 @@ static int idxd_cdev_release(struct inode *node, struct file *filep)
 	filep->private_data = NULL;
 
 	kfree(ctx);
+	mutex_lock(&wq->wq_lock);
 	idxd_wq_put(wq);
+	mutex_unlock(&wq->wq_lock);
 	return 0;
 }