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drm/i915/ddi: only call shutdown hooks for valid encoders

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commit 60a43ecbd5 upstream.

DDI might be HDMI or DP only, leaving the other encoder
uninitialized. Calling the shutdown hook on an uninitialized encoder may
lead to a NULL pointer dereference. Check the encoder types (and thus
validity via the DP output_reg or HDMI hdmi_reg checks) before calling
the hooks.

Reported-and-tested-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Closes: https://lore.kernel.org/r/20241031105145.2140590-1-senozhatsky@chromium.org
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/8b197c50e7f3be2bbc07e3935b21e919815015d5.1735568047.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jani Nikula 2024-12-30 16:14:45 +02:00 committed by Greg Kroah-Hartman
parent 4a764acf4a
commit 7384e0637f
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/display/intel_ddi.c
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@ -4798,8 +4798,10 @@ static void intel_ddi_tc_encoder_suspend_complete(struct intel_encoder *encoder)
static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
{
intel_dp_encoder_shutdown(encoder);
intel_hdmi_encoder_shutdown(encoder);
if (intel_encoder_is_dp(encoder))
intel_dp_encoder_shutdown(encoder);
if (intel_encoder_is_hdmi(encoder))
intel_hdmi_encoder_shutdown(encoder);
}
static void intel_ddi_tc_encoder_shutdown_complete(struct intel_encoder *encoder)