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Staging: comedi: serial2002: Reduce stack usage on 'open' 

Reduce stack usage in serial_2002_open() by allocating dig_in_config,
dig_out_config, chan_in_config, and chan_out_config temporary arrays
using kcalloc() and freeing them when done with.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Abbott 2010-05-19 14:10:03 +01:00 committed by Greg Kroah-Hartman
parent fa3b5d9ab0
commit 668f272e57
1 changed files with 23 additions and 21 deletions
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44
drivers/staging/comedi/drivers/serial2002.c
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@ -412,30 +412,25 @@ static int serial_2002_open(struct comedi_device *dev)
int max;
};
struct config_t dig_in_config[32];
struct config_t dig_out_config[32];
struct config_t chan_in_config[32];
struct config_t chan_out_config[32];
struct config_t *dig_in_config;
struct config_t *dig_out_config;
struct config_t *chan_in_config;
struct config_t *chan_out_config;
int i;
result = 0;
for (i = 0; i < 32; i++) {
dig_in_config[i].kind = 0;
dig_in_config[i].bits = 0;
dig_in_config[i].min = 0;
dig_in_config[i].max = 0;
dig_out_config[i].kind = 0;
dig_out_config[i].bits = 0;
dig_out_config[i].min = 0;
dig_out_config[i].max = 0;
chan_in_config[i].kind = 0;
chan_in_config[i].bits = 0;
chan_in_config[i].min = 0;
chan_in_config[i].max = 0;
chan_out_config[i].kind = 0;
chan_out_config[i].bits = 0;
chan_out_config[i].min = 0;
chan_out_config[i].max = 0;
dig_in_config = kcalloc(32, sizeof(struct config_t),
GFP_KERNEL);
dig_out_config = kcalloc(32, sizeof(struct config_t),
GFP_KERNEL);
chan_in_config = kcalloc(32, sizeof(struct config_t),
GFP_KERNEL);
chan_out_config = kcalloc(32, sizeof(struct config_t),
GFP_KERNEL);
if (!dig_in_config || !dig_out_config
|| !chan_in_config || !chan_out_config) {
result = -ENOMEM;
goto err_alloc_configs;
}
tty_setspeed(devpriv->tty, devpriv->speed);
@ -690,6 +685,13 @@ static int serial_2002_open(struct comedi_device *dev)
s->range_table_list = NULL;
}
}
err_alloc_configs:
kfree(dig_in_config);
kfree(dig_out_config);
kfree(chan_in_config);
kfree(chan_out_config);
if (result) {
if (devpriv->tty) {
filp_close(devpriv->tty, 0);