5.15-stable review patch. If anyone has any objections, please let me know.
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From: Douglas Anderson dianders@chromium.org
[ Upstream commit aa4f2b3e418e8673e55145de8b8016a7a9920306 ]
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.Ie00e07f07f87149c9ce0b27ae4e26991...
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.Ie00e07f07f87149c9ce0b27ae4e26... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/r8152.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index e8fd743a1509..85b98fd06ba2 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -9872,7 +9872,7 @@ static struct usb_driver rtl8152_driver = { .disable_hub_initiated_lpm = 1, };
-static int rtl8152_cfgselector_probe(struct usb_device *udev) +static int rtl8152_cfgselector_choose_configuration(struct usb_device *udev) { struct usb_host_config *c; int i, num_configs; @@ -9899,19 +9899,13 @@ static int rtl8152_cfgselector_probe(struct usb_device *udev) if (i == num_configs) return -ENODEV;
- if (usb_set_configuration(udev, c->desc.bConfigurationValue)) { - dev_err(&udev->dev, "Failed to set configuration %d\n", - c->desc.bConfigurationValue); - return -ENODEV; - } - - return 0; + return c->desc.bConfigurationValue; }
static struct usb_device_driver rtl8152_cfgselector_driver = { - .name = MODULENAME "-cfgselector", - .probe = rtl8152_cfgselector_probe, - .id_table = rtl8152_table, + .name = MODULENAME "-cfgselector", + .choose_configuration = rtl8152_cfgselector_choose_configuration, + .id_table = rtl8152_table, .generic_subclass = 1, .supports_autosuspend = 1, };