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From: Johan Hovold <>
To: Johan Hovold <>
	"Paul Größel" <>,, "Willy Tarreau" <>
Subject: [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates"
Date: Tue, 24 Aug 2021 14:19:26 +0200	[thread overview]
Message-ID: <> (raw)

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

Reported-by: Paul Größel <>
Fixes: 3c18e9baee0e ("USB: serial: ch341: fix character loss at high transfer rates")
Cc: Willy Tarreau <>
Signed-off-by: Johan Hovold <>
 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,

             reply	other threads:[~2021-08-24 12:20 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 12:19 Johan Hovold [this message]
2021-08-24 12:32 ` Willy Tarreau
2021-08-24 13:25   ` Johan Hovold
2021-08-24 15:06     ` Willy Tarreau

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