linux-kernel - [PATCH v6 2/3] usb: gadget: f_midi: fail if set

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Message-Id: <1448994662-21294-3-git-send-email-eu@felipetonello.com>
Date:	Tue,  1 Dec 2015 18:31:01 +0000
From:	"Felipe F. Tonello" <eu@...ipetonello.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Clemens Ladisch <clemens@...isch.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v6 2/3] usb: gadget: f_midi: fail if set_alt fails to allocate requests

This ensures that the midi function will only work if the proper number of
IN and OUT requrests are allocated. Otherwise the function will work with less
requests then what the user wants.

Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
---
 drivers/usb/gadget/function/f_midi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index e804231..79dc611 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -344,9 +344,10 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		req->complete = f_midi_complete;
 		err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
 		if (err) {
-			ERROR(midi, "%s queue req: %d\n",
+			ERROR(midi, "%s: couldn't enqueue request: %d\n",
 				    midi->out_ep->name, err);
 			free_ep_req(midi->out_ep, req);
+			return err;
 		}
 	}
 
-- 
2.5.0

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