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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 <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 4 additions and 4 deletions
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@ -2674,11 +2674,11 @@ void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
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}
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if (async->cb_mask & events) {
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int si_code;
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wake_up_interruptible(&async->wait_head);
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if (s->subdev_flags & SDF_CMD_READ)
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kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
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if (s->subdev_flags & SDF_CMD_WRITE)
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kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
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si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN;
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kill_fasync(&dev->async_queue, SIGIO, si_code);
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}
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}
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EXPORT_SYMBOL_GPL(comedi_event);
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