drm/i915/gem: fix bitwise and logical AND mixup

CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND is an int, defaulting to 250. When
the wakeref is non-zero, it's either -1 or a dynamically allocated
pointer, depending on CONFIG_DRM_I915_DEBUG_RUNTIME_PM. It's likely that
the code works by coincidence with the bitwise AND, but with
CONFIG_DRM_I915_DEBUG_RUNTIME_PM=y, there's the off chance that the
condition evaluates to false, and intel_wakeref_auto() doesn't get
called. Switch to the intended logical AND.

v2: Use != to avoid clang -Wconstant-logical-operand (Nathan)

Fixes: ad74457 ("drm/i915/dgfx: Release mmap on rpm suspend")
Cc: Matthew Auld <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Anshuman Gupta <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: [email protected] # v6.1+
Reviewed-by: Matthew Auld <[email protected]>
Reviewed-by: Andi Shyti <[email protected]> # v1
Link: https://patchwork.freedesktop.org/patch/msgid/643cc0a4d12f47fd8403d42581e83b1e9c4543c7.1726680898.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <[email protected]>
(cherry picked from commit 4c1bfe2)
Signed-off-by: Joonas Lahtinen <[email protected]>

Author: jnikula

drivers/gpu/drm/i915/gem/i915_gem_ttm.c

@@ -1131,7 +1131,7 @@ static vm_fault_t vm_fault_ttm(struct vm_fault *vmf)
 		GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(bo->resource));
 	}
 
-	if (wakeref & CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
+	if (wakeref && CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND != 0)
 		intel_wakeref_auto(&to_i915(obj->base.dev)->runtime_pm.userfault_wakeref,
 				   msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));