[PATCH 5.6 101/177] gpu/drm: Ingenic: Fix opaque pointer casted to wrong type

From: Greg Kroah-Hartman
Date: Mon Jun 01 2020 - 14:38:39 EST

From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>

[ Upstream commit abf56fadf0e208abfb13ad1ac0094416058da0ad ]

The opaque pointer passed to the IRQ handler is a pointer to the
drm_device, not a pointer to our ingenic_drm structure.

It still worked, because our ingenic_drm structure contains the
drm_device as its first field, so the pointer received had the same
value, but this was not semantically correct.

Cc: stable@xxxxxxxxxxxxxxx # v5.3
Fixes: 90b86fcc47b4 ("DRM: Add KMS driver for the Ingenic JZ47xx SoCs")
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200516215057.392609-5-paul@xxxxxxxxxxxxxxx
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/gpu/drm/ingenic/ingenic-drm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
index 8f5077370a52..e9900e078d51 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -474,7 +474,7 @@ static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,

static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
- struct ingenic_drm *priv = arg;
+ struct ingenic_drm *priv = drm_device_get_priv(arg);
unsigned int state;

regmap_read(priv->map, JZ_REG_LCD_STATE, &state);