linux-kernel - [PATCH] usb: gadget: f_fs: use complete() instead complete

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Date:   Thu, 22 Sep 2016 15:51:53 +0200
From:   Daniel Wagner <wagi@...om.org>
To:     linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Daniel Wagner <daniel.wagner@...-carit.de>,
        Felipe Balbi <balbi@...nel.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] usb: gadget: f_fs: use complete() instead complete_all()

From: Daniel Wagner <daniel.wagner@...-carit.de>

There is only one waiter for the completion, therefore there
is no need to use complete_all(). Let's make that clear by
using complete() instead of complete_all().

The usage pattern of the completion is:

waiter context                          waker context
  reinit_completion()
  usb_esp_queue()
  wait_for_completion_interruptible()

					ffs_ep0_complete()
					  complete()

Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Michal Nazarewicz <mina86@...a86.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
---
 drivers/usb/gadget/function/f_fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 5c8429f..0c29039 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -211,7 +211,7 @@ static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	struct ffs_data *ffs = req->context;
 
-	complete_all(&ffs->ep0req_completion);
+	complete(&ffs->ep0req_completion);
 }
 
 static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len)
-- 
2.7.4