r8152: Choose our USB config with choose_configuration() rather than probe()
authorDouglas Anderson <dianders@chromium.org>
Fri, 1 Dec 2023 18:29:52 +0000 (10:29 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 4 Dec 2023 13:28:20 +0000 (22:28 +0900)
commitaa4f2b3e418e8673e55145de8b8016a7a9920306
tree394e09a28f55b0ba8c41ee494697aab4b151a4e9
parenta87b8e3be926af0fc3b9b1af42b1127bd1ff077c
r8152: Choose our USB config with choose_configuration() rather than probe()

If you deauthorize the r8152 device (by writing 0 to the "authorized"
field in sysfs) and then reauthorize it (by writing a 1) then it no
longer works. This is because when you do the above we lose the
special configuration that we set in rtl8152_cfgselector_probe().
Deauthorizing causes the config to be set to -1 and then reauthorizing
runs the default logic for choosing the best config.

I made an attempt to fix it so that the config is kept across
deauthorizing / reauthorizing [1] but it was a bit ugly.

Let's instead use the new USB core feature to override
choose_configuration().

This patch relies upon the patches ("usb: core: Don't force USB
generic_subclass drivers to define probe()") and ("usb: core: Allow
subclassed USB drivers to override usb_choose_configuration()")

[1] https://lore.kernel.org/r/20231130154337.1.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid

Fixes: ec51fbd1b8a2 ("r8152: add USB device driver for config selection")
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Link: https://lore.kernel.org/r/20231201102946.v2.3.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/usb/r8152.c