`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@xxxxxxxxx>
---
drivers/staging/comedi/comedi_fops.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 68ced20..7ae605f 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);
--
2.1.4
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