Allow the synchronous serdev_device_write() helper to be interrupted.
This is useful for cases where I/O is performed on behalf of user space
and we don't want to block indefinitely when using flow control.
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
int serdev_device_write(struct serdev_device *serdev,
const unsigned char *buf, size_t count,
- unsigned long timeout)
+ long timeout)
{
struct serdev_controller *ctrl = serdev->ctrl;
int written = 0;
written += ret;
buf += ret;
count -= ret;
- } while (count &&
- (timeout = wait_for_completion_timeout(&serdev->write_comp,
- timeout)));
+
+ if (count == 0)
+ break;
+
+ timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp,
+ timeout);
+ } while (timeout > 0);
mutex_unlock(&serdev->write_lock);
if (ret < 0)
return ret;
- if (timeout == 0 && written == 0)
- return -ETIMEDOUT;
+ if (timeout <= 0 && written == 0) {
+ if (timeout == -ERESTARTSYS)
+ return -ERESTARTSYS;
+ else
+ return -ETIMEDOUT;
+ }
return written;
}
int serdev_device_get_tiocm(struct serdev_device *);
int serdev_device_set_tiocm(struct serdev_device *, int, int);
void serdev_device_write_wakeup(struct serdev_device *);
-int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, unsigned long);
+int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, long);
void serdev_device_write_flush(struct serdev_device *);
int serdev_device_write_room(struct serdev_device *);