Commit df7b16d1 authored by Johan Hovold's avatar Johan Hovold
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Revert "USB: serial: ch341: fix character loss at high transfer rates"

This reverts commit 3c18e9ba


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: default avatarPaul Größel <>
Fixes: 3c18e9ba ("USB: serial: ch341: fix character loss at high transfer rates")
Cc: Willy Tarreau <>

Signed-off-by: default avatarJohan Hovold <>
parent 2829a4e3
......@@ -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,
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