This is a note to let you know that I've just added the patch titled
staging: comedi: COMEDI_CANCEL ioctl should wake up read/write
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-comedi-comedi_cancel-ioctl-should-wake-up-read-write.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 69acbaac303e8cb948801a9ddd0ac24e86cc4a1b Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@xxxxxxxxx>
Date: Mon, 8 Jul 2013 13:36:19 +0100
Subject: staging: comedi: COMEDI_CANCEL ioctl should wake up read/write
From: Ian Abbott <abbotti@xxxxxxxxx>
commit 69acbaac303e8cb948801a9ddd0ac24e86cc4a1b upstream.
Comedi devices can do blocking read() or write() (or poll()) if an
asynchronous command has been set up, blocking for data (for read()) or
buffer space (for write()). Various events associated with the
asynchronous command will wake up the blocked reader or writer (or
poller). It is also possible to force the asynchronous command to
terminate by issuing a `COMEDI_CANCEL` ioctl. That shuts down the
asynchronous command, but does not currently wake up the blocked reader
or writer (or poller). If the blocked task could be woken up, it would
see that the command is no longer active and return. The caller of the
`COMEDI_CANCEL` ioctl could attempt to wake up the blocked task by
sending a signal, but that's a nasty workaround.
Change `do_cancel_ioctl()` to wake up the wait queue after it returns
from `do_cancel()`. `do_cancel()` can propagate an error return value
from the low-level comedi driver's cancel routine, but it always shuts
the command down regardless, so `do_cancel_ioctl()` can wake up he wait
queue regardless of the return value from `do_cancel()`.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/comedi_fops.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1370,6 +1370,7 @@ static int do_cancel_ioctl(struct comedi
void *file)
{
struct comedi_subdevice *s;
+ int ret;
if (arg >= dev->n_subdevices)
return -EINVAL;
@@ -1386,7 +1387,11 @@ static int do_cancel_ioctl(struct comedi
if (s->busy != file)
return -EBUSY;
- return do_cancel(dev, s);
+ ret = do_cancel(dev, s);
+ if (comedi_get_subdevice_runflags(s) & SRF_USER)
+ wake_up_interruptible(&s->async->wait_head);
+
+ return ret;
}
/*
Patches currently in stable-queue which might be from abbotti@xxxxxxxxx are
queue-3.4/staging-comedi-comedi_cancel-ioctl-should-wake-up-read-write.patch
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