On 08/04/16 18:14, H Hartley Sweeten wrote:
DMA is optional with this driver. If it was not enabled the devpriv->dma
pointer will be NULL.
Fix the possible NULL pointer dereference when trying to disable the DMA
channels in das1800_ai_cancel() and tidy up the comments to fix the
checkpatch.pl issues:
WARNING: line over 80 characters
It's probably harmless in das1800_ai_setup_dma() because the 'desc' pointer
will not be used if DMA is disabled but fix it there also.
Fixes: 99dfc3357e98 ("staging: comedi: das1800: remove depends on ISA_DMA_API limitation")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.0+
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/das1800.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
Thanks!
Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>
(I've already reviewed the other two.)
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-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Web: http://www.mev.co.uk/ )=-
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