Merge tag 'qcom-soc-for-3.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / drivers / usb / gadget / f_fs.c

diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 2e164dc..1e12b3e 100644 (file)
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -745,6 +745,12 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
                 */
                struct usb_gadget *gadget = epfile->ffs->gadget;
 
+               spin_lock_irq(&epfile->ffs->eps_lock);
+               /* In the meantime, endpoint got disabled or changed. */
+               if (epfile->ep != ep) {
+                       spin_unlock_irq(&epfile->ffs->eps_lock);
+                       return -ESHUTDOWN;
+               }
                /*
                 * Controller may require buffer size to be aligned to
                 * maxpacketsize of an out endpoint.
@@ -752,6 +758,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
                data_len = io_data->read ?
                           usb_ep_align_maybe(gadget, ep->ep, io_data->len) :
                           io_data->len;
+               spin_unlock_irq(&epfile->ffs->eps_lock);
 
                data = kmalloc(data_len, GFP_KERNEL);
                if (unlikely(!data))