Patch "USB: serial: ftdi_sio: fix setting latency for unprivileged users" has been added to the 4.11-stable tree
Subsystems (3)
This is a note to let you know that I've just added the patch titled
USB: serial: ftdi_sio: fix setting latency for unprivileged users
to the 4.11-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-serial-ftdi_sio-fix-setting-latency-for-unprivileged-users.patch
and it can be found in the queue-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
bb246681b3ed0967489a7401ad528c1aaa1a4c2eMon Sep 17 00:00:00 2001
From: Anthony Mallet <[email protected]>
Date: Fri, 5 May 2017 17:30:16 +0200
Subject: USB: serial: ftdi_sio: fix setting latency for unprivileged users
From: Anthony Mallet <[email protected]>
commit bb246681b3ed0967489a7401ad528c1aaa1a4c2e upstream.
Commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY flag") enables unprivileged users to set the FTDI latency timer, but there was a logic flaw that skipped sending the corresponding USB control message to the device.
Specifically, the device latency timer would not be updated until next open, something which was later also inadvertently broken by commit c19db4c9e49a ("USB: ftdi_sio: set device latency timeout at port probe").
A recent commit c6dce2626606 ("USB: serial: ftdi_sio: fix extreme low-latency setting") disabled the low-latency mode by default so we now need this fix to allow unprivileged users to again enable it.
--- drivers/usb/serial/ftdi_sio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/usb/serial/ftdi_sio.c +1 -1
@@ -1506,9 +1506,9 @@ static int set_serial_info(struct tty_st (new_serial.flags & ASYNC_FLAGS)); priv->custom_divisor = new_serial.custom_divisor; +check_and_exit:write_latency_timer (port); -check_and_exit:if ((old_priv.flags &ASYNC_SPD_MASK ) != (priv->flags &ASYNC_SPD_MASK )) {if ((priv->flags &ASYNC_SPD_MASK ) ==ASYNC_SPD_HI )
Patches currently in stable-queue which might be from [email protected] are
queue-4.11/usb-serial-ftdi_sio-fix-setting-latency-for-unprivileged-users.patch