linux-kernel - [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates"

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Message-Id: <20210824121926.19311-1-johan@kernel.org>
Date:   Tue, 24 Aug 2021 14:19:26 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Größel <pb.g@....de>,
        stable@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates"

This reverts commit 3c18e9baee0ef97510dcda78c82285f52626764b.

These devices do not appear to send a zero-length packet when the
transfer size is a multiple of the bulk-endpoint max-packet size. This
means that incoming data may not be processed by the driver until a
short packet is received or the receive buffer is full.

Revert back to using endpoint-sized receive buffers to avoid stalled
reads.

Reported-by: Paul Größel <pb.g@....de>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=214131
Fixes: 3c18e9baee0e ("USB: serial: ch341: fix character loss at high transfer rates")
Cc: stable@...r.kernel.org
Cc: Willy Tarreau <w@....eu>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/ch341.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 8a521b5ea769..2db917eab799 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -851,7 +851,6 @@ static struct usb_serial_driver ch341_device = {
 		.owner	= THIS_MODULE,
 		.name	= "ch341-uart",
 	},
-	.bulk_in_size      = 512,
 	.id_table          = id_table,
 	.num_ports         = 1,
 	.open              = ch341_open,
-- 
2.31.1