From e8635b48dad0c06b4efcfc20c1e656912fcd9313 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Tue, 24 Aug 2021 14:19:26 +0200 Subject: [PATCH] Revert "USB: serial: ch341: fix character loss at high transfer rates" MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 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 Link: https://lore.kernel.org/r/20210824121926.19311-1-johan@kernel.org Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- 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 3f3535d3c99ee..2cff9c40f28aa 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -585,7 +585,6 @@ 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, -- 2.47.2