diff options
| author | Laura Abbott <labbott@redhat.com> | 2018-03-28 20:59:57 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-05-24 11:22:21 +0300 |
| commit | 97fe7bef56e60ef6efa186348908b954a236b2fb (patch) | |
| tree | 09b82f5916758c672ce2d6ab61c6e0816efcb819 /drivers/gpio | |
| parent | 014e420d8ab5cc3cd8828a4ac2690048e1040754 (diff) | |
| download | linux-97fe7bef56e60ef6efa186348908b954a236b2fb.tar.xz | |
gpio: Remove VLA from stmpe driver
The new challenge is to remove VLAs from the kernel
(see https://lkml.org/lkml/2018/3/7/621)
The number of GPIOs on the supported chips is fairly small
so stack allocate to a known upper bound and spit out a warning
if any new chips have more gpios.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Phil Reid <preid@electromag.com.au>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-stmpe.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c index f8d7d1cd8488..8d6a5a7e612d 100644 --- a/drivers/gpio/gpio-stmpe.c +++ b/drivers/gpio/gpio-stmpe.c @@ -363,13 +363,15 @@ static struct irq_chip stmpe_gpio_irq_chip = { .irq_set_type = stmpe_gpio_irq_set_type, }; +#define MAX_GPIOS 24 + static irqreturn_t stmpe_gpio_irq(int irq, void *dev) { struct stmpe_gpio *stmpe_gpio = dev; struct stmpe *stmpe = stmpe_gpio->stmpe; u8 statmsbreg; int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8); - u8 status[num_banks]; + u8 status[DIV_ROUND_UP(MAX_GPIOS, 8)]; int ret; int i; @@ -434,6 +436,11 @@ static int stmpe_gpio_probe(struct platform_device *pdev) struct stmpe_gpio *stmpe_gpio; int ret, irq; + if (stmpe->num_gpios > MAX_GPIOS) { + dev_err(&pdev->dev, "Need to increase maximum GPIO number\n"); + return -EINVAL; + } + stmpe_gpio = kzalloc(sizeof(*stmpe_gpio), GFP_KERNEL); if (!stmpe_gpio) return -ENOMEM; |