diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2015-01-26 14:20:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-28 11:16:18 -0800 |
| commit | fd27ae76d29d59aa834bf26d45535b1ba09ab543 (patch) | |
| tree | bdadf3089c3eabef3ee62cc31fee3cff5282db6f /drivers | |
| parent | 119c964399559e4bbfda9cdd7161c499ddba1470 (diff) | |
staging: comedi: pcl812: fix logic error in pcl812_ai_setup_dma()
commit 92afc2b229038d7b962ae69de5b07bc6c1cf51bf inroduced a logic error
in the DMA size calculation.
If the 'nsamples' is greater than the 'unread_samples' then DMA needs to
be restarted. The current code checks it agains the 'max_samples'.
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')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcl812.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c index 37cc5e45f10c..3ffb1ea2ecc8 100644 --- a/drivers/staging/comedi/drivers/pcl812.c +++ b/drivers/staging/comedi/drivers/pcl812.c @@ -559,8 +559,8 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev, * unread samples and the number of samples remaining in the command. */ nsamples = comedi_nsamples_left(s, max_samples + unread_samples); - if (nsamples > max_samples) { - nsamples -= max_samples; + if (nsamples > unread_samples) { + nsamples -= unread_samples; desc->size = comedi_samples_to_bytes(s, nsamples); comedi_isadma_program(desc); } |