[PATCH AUTOSEL 6.10 066/121] drm/bridge: tc358767: Check if fully initialized before signalling HPD event via IRQ

Sasha Levin
2024-08-01T00:15:10Z

From: Marek Vasut <marex@denx.de>

[ Upstream commit 162e48cb1d84c2c966b649b8ac5c9d4f75f6d44f ]

Make sure the connector is fully initialized before signalling any
HPD events via drm_kms_helper_hotplug_event(), otherwise this may
lead to NULL pointer dereference.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531203333.277476-1-marex@denx.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/bridge/tc358767.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 166f9a3e9622d..332f0aa50fee4 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -2135,7 +2135,7 @@ static irqreturn_t tc_irq_handler(int irq, void *arg)
dev_err(tc->dev, "syserr %x\n", stat);
}

- if (tc->hpd_pin >= 0 && tc->bridge.dev) {
+ if (tc->hpd_pin >= 0 && tc->bridge.dev && tc->aux.drm_dev) {
/*
* H is triggered when the GPIO goes high.
*
--
2.43.0