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staging: comedi: das16: tidy up user ai/ao range initialization

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The allocation of the user range tables could fail. Make sure to check
for it.

Change the kmalloc()'s to kzalloc()'s to make sure the allocated range
tables are initialized to a known state.

Change the local variables so they can be used for both the ai and ao
range initialization and use shorter names to keep the lines < 80 chars.

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>
This commit is contained in:
H Hartley Sweeten
2013-07-29 14:07:53 -07:00
committed by Greg Kroah-Hartman
parent 3ffb03e62a
commit 05591eaf71
1 changed files with 29 additions and 24 deletions
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53
drivers/staging/comedi/drivers/das16.c
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@@ -987,8 +987,8 @@ static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
const struct das16_board *board = comedi_board(dev);
struct das16_private_struct *devpriv;
struct comedi_subdevice *s;
struct comedi_krange *user_ai_range;
struct comedi_krange *user_ao_range;
struct comedi_lrange *lrange;
struct comedi_krange *krange;
unsigned int dma_chan = it->options[2];
unsigned int status;
int ret;
@@ -1077,32 +1077,37 @@ static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
devpriv->timer.data = (unsigned long)dev;
}
/* get any user-defined input range */
/* get any user-defined input range */
if (board->ai_pg == das16_pg_none &&
(it->options[4] || it->options[5])) {
/* allocate single-range range table */
devpriv->user_ai_range_table =
kmalloc(sizeof(struct comedi_lrange) +
sizeof(struct comedi_krange), GFP_KERNEL);
/* initialize ai range */
devpriv->user_ai_range_table->length = 1;
user_ai_range = devpriv->user_ai_range_table->range;
user_ai_range->min = it->options[4];
user_ai_range->max = it->options[5];
user_ai_range->flags = UNIT_volt;
/* allocate single-range range table */
lrange = kzalloc(sizeof(*lrange) + sizeof(*krange), GFP_KERNEL);
if (!lrange)
return -ENOMEM;
/* initialize ai range */
devpriv->user_ai_range_table = lrange;
lrange->length = 1;
krange = devpriv->user_ai_range_table->range;
krange->min = it->options[4];
krange->max = it->options[5];
krange->flags = UNIT_volt;
}
/* get any user-defined output range */
/* get any user-defined output range */
if (it->options[6] || it->options[7]) {
/* allocate single-range range table */
devpriv->user_ao_range_table =
kmalloc(sizeof(struct comedi_lrange) +
sizeof(struct comedi_krange), GFP_KERNEL);
/* initialize ao range */
devpriv->user_ao_range_table->length = 1;
user_ao_range = devpriv->user_ao_range_table->range;
user_ao_range->min = it->options[6];
user_ao_range->max = it->options[7];
user_ao_range->flags = UNIT_volt;
/* allocate single-range range table */
lrange = kzalloc(sizeof(*lrange) + sizeof(*krange), GFP_KERNEL);
if (!lrange)
return -ENOMEM;
/* initialize ao range */
devpriv->user_ao_range_table = lrange;
lrange->length = 1;
krange = devpriv->user_ao_range_table->range;
krange->min = it->options[6];
krange->max = it->options[7];
krange->flags = UNIT_volt;
}
ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);