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Revert "USB: serial: ch341: fix character loss at high transfer rates"

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commit df7b16d1c00ecb3da3a30c999cdb39f273c99a2f upstream.

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@gmx.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@vger.kernel.org
Cc: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20210824121926.19311-1-johan@kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-08-24 14:19:26 +02:00 • committed by Greg Kroah-Hartman
commit 2e098e91ee
1 changed files with 0 additions and 1 deletions
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1
drivers/usb/serial/ch341.c
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@ -678,7 +678,6 @@ 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,