linux-kernel - [PATCH] usb: gadget: f_midi: Fixing wMaxPacketSize exceeded issue during MIDI bind retries

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Message-ID: <20241208152322.1653-1-selvarasu.g@samsung.com>
Date: Sun,  8 Dec 2024 20:53:20 +0530
From: Selvarasu Ganesan <selvarasu.g@...sung.com>
To: gregkh@...uxfoundation.org, quic_jjohnson@...cinc.com, kees@...nel.org,
	abdul.rahim@...ahoo.com, m.grzeschik@...gutronix.de,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jh0801.jung@...sung.com, dh10.jung@...sung.com, naushad@...sung.com,
	akash.m5@...sung.com, rc93.raju@...sung.com, taehyun.cho@...sung.com,
	hongpooh.kim@...sung.com, eomji.oh@...sung.com, shijie.cai@...sung.com,
	alim.akhtar@...sung.com, Selvarasu Ganesan <selvarasu.g@...sung.com>,
	stable@...r.kernel.org
Subject: [PATCH] usb: gadget: f_midi: Fixing wMaxPacketSize exceeded issue
 during MIDI bind retries

The current implementation sets the wMaxPacketSize of bulk in/out
endpoints to 1024 bytes at the end of the f_midi_bind function. However,
in cases where there is a failure in the first midi bind attempt,
consider rebinding. This scenario may encounter an f_midi_bind issue due
to the previous bind setting the bulk endpoint's wMaxPacketSize to 1024
bytes, which exceeds the ep->maxpacket_limit where configured TX/RX
FIFO's maxpacket size of 512 bytes for IN/OUT endpoints in support HS
speed only.
This commit addresses this issue by resetting the wMaxPacketSize before
endpoint claim.

Fixes: 46decc82ffd5 ("usb: gadget: unconditionally allocate hs/ss descriptor in bind operation")
Cc: stable@...r.kernel.org
Signed-off-by: Selvarasu Ganesan <selvarasu.g@...sung.com>
---
 drivers/usb/gadget/function/f_midi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 837fcdfa3840..5caa0e4eb07e 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -907,6 +907,15 @@ static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
 
 	status = -ENODEV;
 
+	/*
+	 * Reset wMaxPacketSize with maximum packet size of FS bulk transfer before
+	 * endpoint claim. This ensures that the wMaxPacketSize does not exceed the
+	 * limit during bind retries where configured TX/RX FIFO's maxpacket size
+	 * of 512 bytes for IN/OUT endpoints in support HS speed only.
+	 */
+	bulk_in_desc.wMaxPacketSize = cpu_to_le16(64);
+	bulk_out_desc.wMaxPacketSize = cpu_to_le16(64);
+
 	/* allocate instance-specific endpoints */
 	midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
 	if (!midi->in_ep)
-- 
2.17.1