diff options
| author | Paul Thomas <pthomas8589@gmail.com> | 2020-01-25 17:14:10 -0500 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-02-10 12:52:34 +0100 |
| commit | c3afa804c58e5c30ac63858b527fffadc88bce82 (patch) | |
| tree | 82078e0024fdb609830262f00c7763cb53819c99 /drivers/gpio/gpio-xilinx.c | |
| parent | dee7c111a458115daecb74a6e3b707260e64e983 (diff) | |
gpio: xilinx: Fix bug where the wrong GPIO register is written to
Care is taken with "index", however with the current version
the actual xgpio_writereg is using index for data but
xgpio_regoffset(chip, i) for the offset. And since i is already
incremented it is incorrect. This patch fixes it so that index
is used for the offset too.
Cc: stable@vger.kernel.org
Signed-off-by: Paul Thomas <pthomas8589@gmail.com>
Link: https://lore.kernel.org/r/20200125221410.8022-1-pthomas8589@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-xilinx.c')
| -rw-r--r-- | drivers/gpio/gpio-xilinx.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index a9748b5198e6..67f9f82e0db0 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -147,9 +147,10 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, for (i = 0; i < gc->ngpio; i++) { if (*mask == 0) break; + /* Once finished with an index write it out to the register */ if (index != xgpio_index(chip, i)) { xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - xgpio_regoffset(chip, i), + index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]); spin_unlock_irqrestore(&chip->gpio_lock[index], flags); index = xgpio_index(chip, i); @@ -165,7 +166,7 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, } xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - xgpio_regoffset(chip, i), chip->gpio_state[index]); + index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]); spin_unlock_irqrestore(&chip->gpio_lock[index], flags); } |