USB: Revert "cdc-wdm: fix "out-of-sync" due to missing notifications"
authorBjørn Mork <bjorn@mork.no>
Fri, 21 Apr 2017 08:01:29 +0000 (10:01 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 25 Apr 2017 18:04:28 +0000 (20:04 +0200)
commit19445816996d1a89682c37685fe95959631d9f32
tree01d3881b519f3b4802668ca20bddd2bea4da337f
parent3d6159640da9c9175d1ca42f151fc1a14caded59
USB: Revert "cdc-wdm: fix "out-of-sync" due to missing notifications"

This reverts commit 833415a3e781 ("cdc-wdm: fix "out-of-sync" due to
missing notifications")

There have been several reports of wdm_read returning unexpected EIO
errors with QMI devices using the qmi_wwan driver. The reporters
confirm that reverting prevents these errors. I have been unable to
reproduce the bug myself, and have no explanation to offer either. But
reverting is the safe choice here, given that the commit was an
attempt to work around a firmware problem.  Living with a firmware
problem is still better than adding driver bugs.

Reported-by: Kasper Holtze <kasper@holtze.dk>
Reported-by: Aleksander Morgado <aleksander@aleksander.es>
Reported-by: Daniele Palmas <dnlplm@gmail.com>
Cc: <stable@vger.kernel.org> # v4.9+
Fixes: 833415a3e781 ("cdc-wdm: fix "out-of-sync" due to missing notifications")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/class/cdc-wdm.c