On Sat, Nov 4, 2017 at 9:12 PM, SF Markus Elfring
<elfring@xxxxxxxxxxxxxxxxxxxxx> wrote:
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Sat, 4 Nov 2017 21:00:46 +0100
>
> * Add jump targets so that a call of the function "mutex_unlock" is stored
> only twice in these function implementations.
>
> * Replace five calls by goto statements.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
NAKed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> ---
> drivers/usb/core/hub.c | 8 ++++----
> drivers/usb/core/message.c | 18 ++++++++++--------
> 2 files changed, 14 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 196a0a5540ed..8f3067c2015c 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -5518,8 +5518,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
> dev_warn(&udev->dev,
> "Busted HC? Not enough HCD resources for "
> "old configuration.\n");
> - mutex_unlock(hcd->bandwidth_mutex);
> - goto re_enumerate;
> + goto unlock;
> }
> ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
> USB_REQ_SET_CONFIGURATION, 0,
> @@ -5529,8 +5528,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
> dev_err(&udev->dev,
> "can't restore configuration #%d (error=%d)\n",
> udev->actconfig->desc.bConfigurationValue, ret);
> - mutex_unlock(hcd->bandwidth_mutex);
> - goto re_enumerate;
> + goto unlock;
> }
> mutex_unlock(hcd->bandwidth_mutex);
> usb_set_device_state(udev, USB_STATE_CONFIGURED);
> @@ -5583,6 +5581,8 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
> udev->bos = bos;
> return 0;
>
> +unlock:
> + mutex_unlock(hcd->bandwidth_mutex);
This makes it harder for the reader, as the mutex_unlock() is now far
below the block
of code that's protected by the lock.
> re_enumerate:
> usb_release_bos_descriptor(udev);
> udev->bos = bos;
> diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
> index 371a07d874a3..fe8e36cc7def 100644
> --- a/drivers/usb/core/message.c
> +++ b/drivers/usb/core/message.c
> @@ -1321,8 +1321,8 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
> */
> if (usb_disable_lpm(dev)) {
> dev_err(&iface->dev, "%s Failed to disable LPM\n.", __func__);
> - mutex_unlock(hcd->bandwidth_mutex);
> - return -ENOMEM;
> + ret = -ENOMEM;
> + goto unlock;
> }
> /* Changing alt-setting also frees any allocated streams */
> for (i = 0; i < iface->cur_altsetting->desc.bNumEndpoints; i++)
> @@ -1332,9 +1332,7 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
> if (ret < 0) {
> dev_info(&dev->dev, "Not enough bandwidth for altsetting %d\n",
> alternate);
> - usb_enable_lpm(dev);
> - mutex_unlock(hcd->bandwidth_mutex);
> - return ret;
> + goto enable_lpm;
> }
>
> if (dev->quirks & USB_QUIRK_NO_SET_INTF)
> @@ -1355,9 +1353,7 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
> } else if (ret < 0) {
> /* Re-instate the old alt setting */
> usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting);
> - usb_enable_lpm(dev);
> - mutex_unlock(hcd->bandwidth_mutex);
> - return ret;
> + goto enable_lpm;
> }
> mutex_unlock(hcd->bandwidth_mutex);
>
> @@ -1413,6 +1409,12 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
> create_intf_ep_devs(iface);
> }
> return 0;
> +
> +enable_lpm:
> + usb_enable_lpm(dev);
> +unlock:
> + mutex_unlock(hcd->bandwidth_mutex);
Likewise.
> + return ret;
> }
> EXPORT_SYMBOL_GPL(usb_set_interface);
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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