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authorLee Jones <lee.jones@linaro.org>2014-08-18 12:10:20 (GMT)
committerLee Jones <lee.jones@linaro.org>2014-09-26 07:15:31 (GMT)
commit9b6a5ad9da4118e8c2a087501ddff33f51a9e6ba (patch)
tree702d8cf37bd598622b9cd86ec59c1d002d0d4559 /drivers/mfd
parent41cc08e955187b96867fa0f625c55496961699ba (diff)
downloadlinux-9b6a5ad9da4118e8c2a087501ddff33f51a9e6ba.tar.xz
mfd: htc-i2cpld: Rectify pointer offset error
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/htc-i2cpld.c33
1 files changed, 10 insertions, 23 deletions
diff --git a/drivers/mfd/htc-i2cpld.c b/drivers/mfd/htc-i2cpld.c
index 073e180..99b362e 100644
--- a/drivers/mfd/htc-i2cpld.c
+++ b/drivers/mfd/htc-i2cpld.c
@@ -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;
-
- /* Try out first */
- chip_data = container_of(chip, struct htcpld_chip, chip_out);
- if (!chip_data) {
- /* Try in */
- is_input = 1;
- chip_data = container_of(chip, struct htcpld_chip, chip_in);
- if (!chip_data)
- return -EINVAL;
- }
+ u8 cache;
- /* 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 (!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);
+ cache = chip_data->cache_in;
+ } else
+ return -EINVAL;
- if (val)
- return 1;
- else
- return 0;
+ return (cache >> offset) & 1;
}
static int htcpld_direction_output(struct gpio_chip *chip,