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>

diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 72c88aa..ab50885 100644 (file)
--- 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;
 }