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Revert "USB: serial: ch341: fix character loss at high transfer rates"
commitdf7b16d1c0
upstream. This reverts commit3c18e9baee
. 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:3c18e9baee
("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>
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@ -628,7 +628,6 @@ static struct usb_serial_driver ch341_device = {
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.owner = THIS_MODULE,
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.name = "ch341-uart",
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},
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.bulk_in_size = 512,
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.id_table = id_table,
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.num_ports = 1,
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.open = ch341_open,
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