staging: emxx_udc: Add comment for spinlock_t definition.

Members of nbu2ss_udc structure can change device state, maintain
completion state and control driver. Also provide access to read and
write to register. Hence, exclusive access to nbu2ss_udc is required.
The lock variable of type spinlock_t guarantees the exclusive access
and protects it.

In this patch, comment is added for spinlock_t definition, to fix the
following checkpatch issue:

CHECK: spinlock_t definition without comment

Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/emxx_udc/emxx_udc.h b/drivers/staging/emxx_udc/emxx_udc.h
index 789bfb9..78c08e1 100644 (file)
--- a/drivers/staging/emxx_udc/emxx_udc.h
+++ b/drivers/staging/emxx_udc/emxx_udc.h
@@ -567,7 +567,7 @@ struct nbu2ss_udc {
        struct usb_gadget_driver *driver;
        struct platform_device *pdev;
        struct device *dev;
-       spinlock_t lock;
+       spinlock_t lock; /* Protects nbu2ss_udc structure fields */
        struct completion               *pdone;
 
        enum ep0_state                  ep0state;