This is a note to let you know that I've just added the patch titled
USB: cdc-acm: downgrade message to debug
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-cdc-acm-downgrade-message-to-debug.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e4c77070ad45fc940af1d7fb1e637c349e848951 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Thu, 11 Mar 2021 14:01:26 +0100
Subject: USB: cdc-acm: downgrade message to debug
From: Oliver Neukum <oneukum@xxxxxxxx>
commit e4c77070ad45fc940af1d7fb1e637c349e848951 upstream.
This failure is so common that logging an error here amounts
to spamming log files.
Reviewed-by: Bruno Thomsen <bruno.thomsen@xxxxxxxxx>
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210311130126.15972-2-oneukum@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/class/cdc-acm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -550,7 +550,8 @@ static void acm_port_dtr_rts(struct tty_
res = acm_set_control(acm, val);
if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
- dev_err(&acm->control->dev, "failed to set dtr/rts\n");
+ /* This is broken in too many devices to spam the logs */
+ dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
}
static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
Patches currently in stable-queue which might be from oneukum@xxxxxxxx are
queue-4.4/usb-cdc-acm-downgrade-message-to-debug.patch
queue-4.4/cdc-acm-fix-break-rx-code-path-adding-necessary-calls.patch
queue-4.4/usb-cdc-acm-fix-use-after-free-after-probe-failure.patch
