| Message ID | 20231201102946.v2.3.Ie00e07f07f87149c9ce0b27ae4e26991d307e14b@changeid (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: usb: r8152: Fix lost config across deauthorize+authorize | expand |
On Fri, Dec 1, 2023 at 10:31 AM Douglas Anderson <dianders@chromium.org> wrote: > > 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> > --- > > Changes in v2: > - ("Choose our USB config with choose_configuration()...) new for v2. > > 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 2c5c1e91ded6..0da723d11326 100644 > --- a/drivers/net/usb/r8152.c > +++ b/drivers/net/usb/r8152.c > @@ -10053,7 +10053,7 @@ 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; > @@ -10080,19 +10080,13 @@ 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.rc2.451.g8631bc7472-goog >
On Fri, 1 Dec 2023 10:29:52 -0800 Douglas Anderson wrote: > 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()") Acked-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c index 2c5c1e91ded6..0da723d11326 100644 --- a/drivers/net/usb/r8152.c +++ b/drivers/net/usb/r8152.c @@ -10053,7 +10053,7 @@ 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; @@ -10080,19 +10080,13 @@ 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, };
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> --- Changes in v2: - ("Choose our USB config with choose_configuration()...) new for v2. drivers/net/usb/r8152.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-)