5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Douglas Anderson <dianders@xxxxxxxxxxxx>
[ 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.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid
Fixes: ec51fbd1b8a2 ("r8152: add USB device driver for config selection")
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Grant Grundler <grundler@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231201102946.v2.3.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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,
};
--
2.43.0
