linux-kernel - [PATCH v4 5/7] usb: gadget: f_midi: set altsettings only for MIDIStreaming interface

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Date:	Mon, 26 Oct 2015 16:55:07 +0000
From:	"Felipe F. Tonello" <eu@...ipetonello.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Clemens Ladisch <clemens@...isch.de>
Subject: [PATCH v4 5/7] usb: gadget: f_midi: set altsettings only for MIDIStreaming interface

This avoids duplication of USB requests for OUT endpoint and
re-enabling endpoints.

Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
---
 drivers/usb/gadget/function/f_midi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 0e9cdeb..a617df3 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -323,6 +323,10 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 	unsigned i;
 	int err;
 
+	/* We don't care if it is not MIDIStreaming interface */
+	if (intf != ms_interface_desc.bInterfaceNumber)
+		return 0;
+
 	err = f_midi_start_ep(midi, f, midi->in_ep);
 	if (err)
 		return err;
-- 
2.1.4

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