diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2016-03-22 11:10:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-28 07:30:36 -0700 |
| commit | 5262d035ef260c3417254b2309892bba013dcab7 (patch) | |
| tree | 154636e1e34a6aff82f85edba0cbb718db949a67 /drivers/staging/comedi/drivers/ni_660x.c | |
| parent | e8f6e2b98d164d94bc29bb488413301d26cc5b3c (diff) | |
staging: comedi: ni_660x: fix memory barrier without comment
Fix the checkpatch.pl issue. Move the memory barrier to a better place.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_660x.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_660x.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c index 2926d265f0bd..bb5b5ff4e32f 100644 --- a/drivers/staging/comedi/drivers/ni_660x.c +++ b/drivers/staging/comedi/drivers/ni_660x.c @@ -613,9 +613,11 @@ static irqreturn_t ni_660x_interrupt(int irq, void *d) if (!dev->attached) return IRQ_NONE; + /* make sure dev->attached is checked before doing anything else */ + smp_mb(); + /* lock to avoid race with comedi_poll */ spin_lock_irqsave(&devpriv->interrupt_lock, flags); - smp_mb(); for (i = 0; i < dev->n_subdevices; ++i) { s = &dev->subdevices[i]; if (s->type == COMEDI_SUBD_COUNTER) |