[PATCH] drm/i915/switcheroo: check for NULL before dereferencing

[Jani Nikula]

Both i915_switcheroo_set_state() and i915_switcheroo_can_switch() check
for i915 == NULL. Commit d2e184f8e16a ("drm/i915/switcheroo: pass
display to HAS_DISPLAY()") started dereferencing it before the NULL
check. Fix it.

Fixes: d2e184f8e16a ("drm/i915/switcheroo: pass display to HAS_DISPLAY()")
Reported-by: kernel test robot <lkp at intel.com>
Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
Closes: https://lore.kernel.org/r/202508160035.hmzuKiww-lkp@intel.com/
Cc: Gustavo Sousa <gustavo.sousa at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/i915_switcheroo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_switcheroo.c b/drivers/gpu/drm/i915/i915_switcheroo.c
index 231d27497706..3a95a55b2e87 100644
--- a/drivers/gpu/drm/i915/i915_switcheroo.c
+++ b/drivers/gpu/drm/i915/i915_switcheroo.c
@@ -15,7 +15,7 @@ static void i915_switcheroo_set_state(struct pci_dev *pdev,
 				      enum vga_switcheroo_state state)
 {
 	struct drm_i915_private *i915 = pdev_to_i915(pdev);
-	struct intel_display *display = i915->display;
+	struct intel_display *display = i915 ? i915->display : NULL;
 	pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
 
 	if (!i915) {
@@ -45,7 +45,7 @@ static void i915_switcheroo_set_state(struct pci_dev *pdev,
 static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
 {
 	struct drm_i915_private *i915 = pdev_to_i915(pdev);
-	struct intel_display *display = i915->display;
+	struct intel_display *display = i915 ? i915->display : NULL;
 
 	/*
 	 * FIXME: open_count is protected by drm_global_mutex but that would lead to
-- 
2.47.2