diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2012-09-24 16:27:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-26 10:45:38 -0700 |
| commit | 3cd73bc1cf59b2c9232d9889ba2b148e262054b6 (patch) | |
| tree | 2284a3ed15ace430a80182ff36798138d39f8246 /drivers | |
| parent | affdc230d7d328d2b602113e459a57d9de5ded08 (diff) | |
staging: comedi: ni_mio_common: always lock in ni_ai_poll()
`ni_ai_poll()` currently acquires (and later releases) the comedi
device's spin-lock iff `in_interrupt()` returns 0. However, it is only
called during processing of a `COMEDI_POLL` ioctl so `in_interrupt()`
will always return 0 in this case. Remove this test and acquire/release
the spin-lock unconditionally. This eliminates a sparse warning about
different lock contexts for basic block.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_mio_common.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c index 87995da00f61..4bbb9798af7e 100644 --- a/drivers/staging/comedi/drivers/ni_mio_common.c +++ b/drivers/staging/comedi/drivers/ni_mio_common.c @@ -1766,20 +1766,18 @@ static int ni_ai_reset(struct comedi_device *dev, struct comedi_subdevice *s) static int ni_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s) { - unsigned long flags = 0; + unsigned long flags; int count; /* lock to avoid race with interrupt handler */ - if (in_interrupt() == 0) - spin_lock_irqsave(&dev->spinlock, flags); + spin_lock_irqsave(&dev->spinlock, flags); #ifndef PCIDMA ni_handle_fifo_dregs(dev); #else ni_sync_ai_dma(dev); #endif count = s->async->buf_write_count - s->async->buf_read_count; - if (in_interrupt() == 0) - spin_unlock_irqrestore(&dev->spinlock, flags); + spin_unlock_irqrestore(&dev->spinlock, flags); return count; } |