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author | Su Sung Chung <Su.Chung@amd.com> | 2019-07-08 11:31:39 -0400 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2019-08-15 10:53:55 -0500 |
commit | 91db9311945f01901ddb9813ce11364de214a156 (patch) | |
tree | 1afec6692b3e5f2a29036ab0b889bf558adf91ac /drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c | |
parent | 37495fbdf12d1bce30dbc228c901ef45eba35739 (diff) | |
download | linux-stable-91db9311945f01901ddb9813ce11364de214a156.tar.gz linux-stable-91db9311945f01901ddb9813ce11364de214a156.tar.bz2 linux-stable-91db9311945f01901ddb9813ce11364de214a156.zip |
drm/amd/display: refactor gpio to allocate hw_container in constructor
[why]
if dynamic allocation fails during gpio_open, it will cause crash due to
page fault.
[how]
handle allocation when gpio object gets created and prevent from calling
gpio_open if allocation failed
Signed-off-by: Su Sung Chung <Su.Chung@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c')
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c b/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c index 5e11d748e6f3..00c9bcf660a3 100644 --- a/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c +++ b/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c @@ -27,6 +27,7 @@ #include "dm_services.h" +#include "include/gpio_interface.h" #include "include/gpio_types.h" #include "hw_gpio.h" #include "hw_hpd.h" @@ -43,6 +44,8 @@ #define REG(reg)\ (hpd->regs->reg) +struct gpio; + static void dal_hw_hpd_construct( struct hw_hpd *pin, enum gpio_id id, @@ -136,29 +139,29 @@ static void construct( hpd->base.base.funcs = &funcs; } -struct hw_gpio_pin *dal_hw_hpd_create( +void dal_hw_hpd_init( + struct hw_hpd **hw_hpd, struct dc_context *ctx, enum gpio_id id, uint32_t en) { - struct hw_hpd *hpd; - - if (id != GPIO_ID_HPD) { + if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { ASSERT_CRITICAL(false); - return NULL; + *hw_hpd = NULL; } - if ((en < GPIO_HPD_MIN) || (en > GPIO_HPD_MAX)) { + *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL); + if (!*hw_hpd) { ASSERT_CRITICAL(false); - return NULL; + return; } - hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL); - if (!hpd) { - ASSERT_CRITICAL(false); - return NULL; - } + construct(*hw_hpd, id, en, ctx); +} + +struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio) +{ + struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio); - construct(hpd, id, en, ctx); - return &hpd->base.base; + return &hw_hpd->base.base; } |