On Thu, Feb 7, 2019 at 3:12 PM Harry Wentland <[email protected]> wrote: > > dal_gpio_open and dal_gpio_unlock_pin dereference hpd_gpio. > Check for NULL before calling those functions. > > Fixes: e261568f94d6 ("drm/amd/display: add gpio lock/unlock") > Reported-by: Przemek Socha <[email protected]> > CC: Chiawen Huang <[email protected]> > CC: Tony Cheng <[email protected]> > Signed-off-by: Harry Wentland <[email protected]>
Acked-by: Alex Deucher <[email protected]> > --- > > I don't have a system to test this on. Can someone give it a spin? > > Harry > > drivers/gpu/drm/amd/display/dc/core/dc_link.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c > b/drivers/gpu/drm/amd/display/dc/core/dc_link.c > index 6d2cef05b4d7..7f5a947ad31d 100644 > --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c > +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c > @@ -1127,10 +1127,11 @@ static bool construct( > link->dc->res_pool->funcs->link_init(link); > > link->hpd_gpio = get_hpd_gpio(link->ctx->dc_bios, link->link_id, > link->ctx->gpio_service); > - dal_gpio_open(link->hpd_gpio, GPIO_MODE_INTERRUPT); > - dal_gpio_unlock_pin(link->hpd_gpio); > - if (link->hpd_gpio != NULL) > + if (link->hpd_gpio != NULL) { > + dal_gpio_open(link->hpd_gpio, GPIO_MODE_INTERRUPT); > + dal_gpio_unlock_pin(link->hpd_gpio); > link->irq_source_hpd = dal_irq_get_source(link->hpd_gpio); > + } > > switch (link->link_id.id) { > case CONNECTOR_ID_HDMI_TYPE_A: > -- > 2.19.1 > _______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx
