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mfd: htc-i2cpld: Rectify pointer offset error

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Checking the result of container_of() against NULL will always result to
false.  Using the offset of member 'chip_out' to find the start of 'struct
htcpld_chip' will result in an offset error when .get_chip() is attempting
to obtain 'htcpld-in'.  Instead, we'll use the correct member based on a
previously the set chip label.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2014-08-18 13:10:20 +01:00
parent 41cc08e955
commit 9b6a5ad9da
1 changed files with 9 additions and 22 deletions
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31
drivers/mfd/htc-i2cpld.c
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@ -258,31 +258,18 @@ static void htcpld_chip_set_ni(struct work_struct *work)
static int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
{
struct htcpld_chip *chip_data;
int val = 0;
int is_input = 0;
u8 cache;
/* Try out first */
chip_data = container_of(chip, struct htcpld_chip, chip_out);
if (!chip_data) {
/* Try in */
is_input = 1;
if (!strncmp(chip->label, "htcpld-out", 10)) {
chip_data = container_of(chip, struct htcpld_chip, chip_out);
cache = chip_data->cache_out;
} else if (!strncmp(chip->label, "htcpld-in", 9)) {
chip_data = container_of(chip, struct htcpld_chip, chip_in);
if (!chip_data)
return -EINVAL;
}
cache = chip_data->cache_in;
} else
return -EINVAL;
/* Determine if this is an input or output GPIO */
if (!is_input)
/* Use the output cache */
val = (chip_data->cache_out >> offset) & 1;
else
/* Use the input cache */
val = (chip_data->cache_in >> offset) & 1;
if (val)
return 1;
else
return 0;
return (cache >> offset) & 1;
}
static int htcpld_direction_output(struct gpio_chip *chip,