From 05591eaf71a9c2ad57e2d59a398ade423a9bda00 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 29 Jul 2013 14:07:53 -0700 Subject: [PATCH] staging: comedi: das16: tidy up user ai/ao range initialization 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/das16.c | 53 ++++++++++++++------------ 1 file changed, 29 insertions(+), 24 deletions(-) diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c index 00ecb3c010d7..da640803d825 100644 --- a/drivers/staging/comedi/drivers/das16.c +++ b/drivers/staging/comedi/drivers/das16.c @@ -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); -- 2.20.1