6.1-stable review patch. If anyone has any objections, please let me know.
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From: Jani Nikula jani.nikula@intel.com
commit 394b52462020b6cceff1f7f47fdebd03589574f3 upstream.
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: ad74457a6b5a ("drm/i915/dgfx: Release mmap on rpm suspend") Cc: Matthew Auld matthew.auld@intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Anshuman Gupta anshuman.gupta@intel.com Cc: Andi Shyti andi.shyti@linux.intel.com Cc: Nathan Chancellor nathan@kernel.org Cc: stable@vger.kernel.org # v6.1+ Reviewed-by: Matthew Auld matthew.auld@intel.com Reviewed-by: Andi Shyti andi.shyti@linux.intel.com # v1 Link: https://patchwork.freedesktop.org/patch/msgid/643cc0a4d12f47fd8403d42581e83b... Signed-off-by: Jani Nikula jani.nikula@intel.com (cherry picked from commit 4c1bfe259ed1d2ade826f95d437e1c41b274df04) Signed-off-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -1058,7 +1058,7 @@ static vm_fault_t vm_fault_ttm(struct vm spin_unlock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock); }
- 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));