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authorFelipe Balbi <felipe.balbi@linux.intel.com>2018-03-26 13:14:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-26 13:22:09 +0200
commiteaa358c7790338d83bb6a31258bdc077de120414 (patch)
tree66a82cb2d8793cfbfc52affdcf8c4a09e6dee864 /drivers/usb
parent53d473fc1e38751b5369373423d58c86a3444b3b (diff)
downloadlinux-eaa358c7790338d83bb6a31258bdc077de120414.tar.bz2
usb: gadget: udc: core: update usb_ep_queue() documentation
Mention that ->complete() should never be called from within usb_ep_queue(). Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/udc/core.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 50988b21a21b..842814bc0e4f 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -238,6 +238,9 @@ EXPORT_SYMBOL_GPL(usb_ep_free_request);
* arranges to poll once per interval, and the gadget driver usually will
* have queued some data to transfer at that time.
*
+ * Note that @req's ->complete() callback must never be called from
+ * within usb_ep_queue() as that can create deadlock situations.
+ *
* Returns zero, or a negative error code. Endpoints that are not enabled
* report errors; errors will also be
* reported when the usb peripheral is disconnected.