From: Ian Abbott Date: Fri, 27 Mar 2015 15:13:05 +0000 (+0000) Subject: staging: comedi: comedi_fops: send SIGIO according to command direction X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=aa33122f005069cb3408acf609b78b9a62f58021;p=openwrt%2Fstaging%2Fblogic.git staging: comedi: comedi_fops: send SIGIO according to command direction `comedi_event()` is called from low-level drivers to handle comedi asynchronous command event flags. Some events cause waiting tasks to be woken up, and a `SIGIO` signal to be sent via `kill_fasync()`. The signal code is `POLL_OUT` if the subdevice supports commands in the "write" direction, or `POLL_IN` for the "read" direction. If the subdevice supports commands in either direction, it sends two `SIGIO` signals, one with each code. Change that latter case to only send one `SIGIO` signal, using the direction of the current command to determine the signal code. If the `CMDF_WRITE` flag is set in the current command, it's in the "write" direction, otherwise it's in the "read" direction. Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 68ced20f5ca5..7ae605f6bbb6 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2674,11 +2674,11 @@ void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) } if (async->cb_mask & events) { + int si_code; + wake_up_interruptible(&async->wait_head); - if (s->subdev_flags & SDF_CMD_READ) - kill_fasync(&dev->async_queue, SIGIO, POLL_IN); - if (s->subdev_flags & SDF_CMD_WRITE) - kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); + si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; + kill_fasync(&dev->async_queue, SIGIO, si_code); } } EXPORT_SYMBOL_GPL(comedi_event);