USB: gadgetfs: protect ep_release with lock

This patch adds mutex protection to ep_release.

Signed-off-by: Milan Svoboda <msvoboda@ra.rockwell.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 72c88aa94d5d..ab508858f341 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -477,6 +477,10 @@ static int
 ep_release (struct inode *inode, struct file *fd)
 {
         struct ep_data          *data = fd->private_data;
+        int value;
+
+        if ((value = down_interruptible(&data->lock)) < 0)
+                return value;
 
         /* clean up if this can be reopened */
         if (data->state != STATE_EP_UNBOUND) {
@@ -485,6 +489,7 @@ ep_release (struct inode *inode, struct file *fd)
                 data->hs_desc.bDescriptorType = 0;
                 usb_ep_disable(data->ep);
         }
+        up (&data->lock);
         put_ep (data);
         return 0;
 }