diff options
| author | Guido Kiener <guido@kiener-muenchen.de> | 2018-09-12 10:50:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-20 13:04:02 +0200 |
| commit | 987b81998b41563113f714009e7e748e1211026d (patch) | |
| tree | e7b4239e0a855080277791ab6af127655a06f1ed /drivers/usb/class | |
| parent | usb: usbtmc: Add ioctl USBTMC_IOCTL_CANCEL_IO (diff) | |
| download | linux-987b81998b41563113f714009e7e748e1211026d.tar.xz linux-987b81998b41563113f714009e7e748e1211026d.zip | |
usb: usbtmc: Add ioctl USBTMC_IOCTL_CLEANUP_IO
The ioctl USBTMC_IOCTL_CLEANUP_IO kills all submitted urbs to OUT
and IN bulk, and clears all received data from IN bulk. Internal
transfer counters and error states are reset.
An application should use this ioctl after an asnychronous transfer
was canceled and/or error handling has finished.
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Reviewed-by: Steve Bayless <steve_bayless@keysight.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 0d8aa4bc3fa7..dc6c04fdfdff 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -1706,6 +1706,21 @@ static int usbtmc_ioctl_cancel_io(struct usbtmc_file_data *file_data) return 0; } +static int usbtmc_ioctl_cleanup_io(struct usbtmc_file_data *file_data) +{ + usb_kill_anchored_urbs(&file_data->submitted); + usb_scuttle_anchored_urbs(&file_data->in_anchor); + spin_lock_irq(&file_data->err_lock); + file_data->in_status = 0; + file_data->in_transfer_size = 0; + file_data->out_status = 0; + file_data->out_transfer_size = 0; + spin_unlock_irq(&file_data->err_lock); + + file_data->in_urbs_used = 0; + return 0; +} + static int get_capabilities(struct usbtmc_device_data *data) { struct device *dev = &data->usb_dev->dev; @@ -2130,6 +2145,10 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case USBTMC_IOCTL_CANCEL_IO: retval = usbtmc_ioctl_cancel_io(file_data); break; + + case USBTMC_IOCTL_CLEANUP_IO: + retval = usbtmc_ioctl_cleanup_io(file_data); + break; } skip_io_on_zombie: |