Hi,
On 9 November 2016 at 23:35, Eugene Korenevsky <ekorenevsky@xxxxxxxxx> wrote:
> Rework smelling code (goto inside compound statement). Perhaps this is
> legacy. Anyway such code is not appropriate for Linux kernel.
>
> Changes since v3: fix typo
> Changes since v2: extract the code to static function
> Changes since v1: fix spaces instead of tab, add missing 'Signed-off-by'
>
> Signed-off-by: Eugene Korenevsky <ekorenevsky@xxxxxxxxx>
> ---
> drivers/usb/core/hub.c | 35 ++++++++++++++++++-----------------
> 1 file changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index cbb1467..b770c8d 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1722,10 +1722,25 @@ static void hub_disconnect(struct usb_interface *intf)
> kref_put(&hub->kref, hub_release);
> }
>
> +static int hub_check_descriptor_sanity(struct usb_host_interface *desc)
> +{
> + /* Some hubs have a subclass of 1, which AFAICT according to the */
> + /* specs is not defined, but it works */
> + if (desc->desc.bInterfaceSubClass != 0 &&
> + desc->desc.bInterfaceSubClass != 1)
> + return 0;
> +
> + /* Multiple endpoints? What kind of mutant ninja-hub is this? */
> + if (desc->desc.bNumEndpoints != 1)
> + return 0;
We usually return 0 as successful result, can you return kernel error
number if we check the descriptor failed? Or change the return value
of the function as bool type.
> +
> + /* If it's not an interrupt in endpoint, we'd better punt! */
> + return usb_endpoint_is_int_in(&desc->endpoint[0].desc);
> +}
> +
> static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
> {
> struct usb_host_interface *desc;
> - struct usb_endpoint_descriptor *endpoint;
> struct usb_device *hdev;
> struct usb_hub *hub;
>
> @@ -1800,25 +1815,11 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
> }
> #endif
>
> - /* Some hubs have a subclass of 1, which AFAICT according to the */
> - /* specs is not defined, but it works */
> - if ((desc->desc.bInterfaceSubClass != 0) &&
> - (desc->desc.bInterfaceSubClass != 1)) {
> -descriptor_error:
> + if (!hub_check_descriptor_sanity(desc)) {
> dev_err(&intf->dev, "bad descriptor, ignoring hub\n");
> return -EIO;
> }
>
> - /* Multiple endpoints? What kind of mutant ninja-hub is this? */
> - if (desc->desc.bNumEndpoints != 1)
> - goto descriptor_error;
> -
> - endpoint = &desc->endpoint[0].desc;
> -
> - /* If it's not an interrupt in endpoint, we'd better punt! */
> - if (!usb_endpoint_is_int_in(endpoint))
> - goto descriptor_error;
> -
> /* We found a hub */
> dev_info(&intf->dev, "USB hub found\n");
>
> @@ -1845,7 +1846,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
> if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
> hub->quirk_check_port_auto_suspend = 1;
>
> - if (hub_configure(hub, endpoint) >= 0)
> + if (hub_configure(hub, &desc->endpoint[0].desc) >= 0)
> return 0;
>
> hub_disconnect(intf);
> --
> 2.10.2
>
>
> --
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--
Baolin.wang
Best Regards
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