linux-kernel - [PATCH v3] usb: gadget: f_midi: Add checking if it need align buffer's size to an ep's maxpacketsize

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Message-Id: <72ab9d95a2eee73f41c38db88bfe50ee103305e4.1468313958.git.baolin.wang@linaro.org>
Date:	Tue, 12 Jul 2016 17:01:39 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	balbi@...nel.org
Cc:	gregkh@...uxfoundation.org, eu@...ipetonello.com,
	mina86@...a86.com, r.baldyga@...sung.com, dan.carpenter@...cle.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	broonie@...nel.org, baolin.wang@...aro.org
Subject: [PATCH v3] usb: gadget: f_midi: Add checking if it need align buffer's size to an ep's maxpacketsize

Some gadget device (such as dwc3 gadget) requires quirk_ep_out_aligned_size
attribute, which means it need to align the request buffer's size to an ep's
maxpacketsize.

Thus we add usb_ep_align_maybe() function to check if it is need to align
the request buffer's size to an ep's maxpacketsize.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
Acked-by: Michal Nazarewicz <mina86@...a86.com>
---
Changelog:
v2:
 - Simplify the method to get buffer length.
v1:
 - Remove the in_ep modification.
 - Remove max_t() function.

 drivers/usb/gadget/function/f_midi.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 58fc199..3486941 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -359,10 +359,13 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 
 	/* allocate a bunch of read buffers and queue them all at once. */
 	for (i = 0; i < midi->qlen && err == 0; i++) {
-		struct usb_request *req =
-			midi_alloc_ep_req(midi->out_ep,
-				max_t(unsigned, midi->buflen,
-					bulk_out_desc.wMaxPacketSize));
+		struct usb_request *req;
+		unsigned length;
+
+		length = usb_ep_align_maybe(midi->gadget, midi->out_ep,
+					    midi->buflen);
+
+		req = midi_alloc_ep_req(midi->out_ep, length);
 		if (req == NULL)
 			return -ENOMEM;
 
-- 
1.7.9.5