diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2020-04-21 12:23:41 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-04-29 13:04:38 +0300 |
| commit | e5ad7db4b2f35aaed796669b47e24c6d79cab3d0 (patch) | |
| tree | d5fc2cf22e0ddb0b89bfe34996f012a204bb58d1 /drivers/media/cec/platform | |
| parent | fcab45adb853a668e9b2f653e792770399bb441a (diff) | |
| download | linux-e5ad7db4b2f35aaed796669b47e24c6d79cab3d0.tar.xz | |
media: cec-gpio: handle gpiod_get_value errors correctly
gpiod_get_value() can return negative values if an error occurs.
In several places this error code was ignored.
Ensure that errors codes are handled correctly throughout the CEC
pin framework and CEC pin drivers.
The return code of the cec_pin_ops read() callback had to be changed
from 'bool' to 'int', which mean the prototype of that callback in the
sun4i drm driver also had to be changed.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/cec/platform')
| -rw-r--r-- | drivers/media/cec/platform/cec-gpio/cec-gpio.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/media/cec/platform/cec-gpio/cec-gpio.c b/drivers/media/cec/platform/cec-gpio/cec-gpio.c index 42d2c2cd9a78..c8c4efc83f5f 100644 --- a/drivers/media/cec/platform/cec-gpio/cec-gpio.c +++ b/drivers/media/cec/platform/cec-gpio/cec-gpio.c @@ -31,12 +31,12 @@ struct cec_gpio { ktime_t v5_ts; }; -static bool cec_gpio_read(struct cec_adapter *adap) +static int cec_gpio_read(struct cec_adapter *adap) { struct cec_gpio *cec = cec_get_drvdata(adap); if (cec->cec_is_low) - return false; + return 0; return gpiod_get_value(cec->cec_gpio); } @@ -71,9 +71,10 @@ static irqreturn_t cec_hpd_gpio_irq_handler_thread(int irq, void *priv) static irqreturn_t cec_5v_gpio_irq_handler(int irq, void *priv) { struct cec_gpio *cec = priv; - bool is_high = gpiod_get_value(cec->v5_gpio); + int val = gpiod_get_value(cec->v5_gpio); + bool is_high = val > 0; - if (is_high == cec->v5_is_high) + if (val < 0 || is_high == cec->v5_is_high) return IRQ_HANDLED; cec->v5_ts = ktime_get(); cec->v5_is_high = is_high; @@ -91,9 +92,10 @@ static irqreturn_t cec_5v_gpio_irq_handler_thread(int irq, void *priv) static irqreturn_t cec_hpd_gpio_irq_handler(int irq, void *priv) { struct cec_gpio *cec = priv; - bool is_high = gpiod_get_value(cec->hpd_gpio); + int val = gpiod_get_value(cec->hpd_gpio); + bool is_high = val > 0; - if (is_high == cec->hpd_is_high) + if (val < 0 || is_high == cec->hpd_is_high) return IRQ_HANDLED; cec->hpd_ts = ktime_get(); cec->hpd_is_high = is_high; @@ -103,8 +105,10 @@ static irqreturn_t cec_hpd_gpio_irq_handler(int irq, void *priv) static irqreturn_t cec_gpio_irq_handler(int irq, void *priv) { struct cec_gpio *cec = priv; + int val = gpiod_get_value(cec->cec_gpio); - cec_pin_changed(cec->adap, gpiod_get_value(cec->cec_gpio)); + if (val >= 0) + cec_pin_changed(cec->adap, val > 0); return IRQ_HANDLED; } |