On error we unpin and free the wa_ctx.vma, but do not clear any of the derived flags. During lrc_init, we look at the flags and attempt to dereference the wa_ctx.vma if they are set. To protect the error path where we try to limp along without the wa_ctx, make sure we clear those flags!
Reported-by: Matt Roper matthew.d.roper@intel.com Fixes: 604a8f6f1e33 ("drm/i915/lrc: Only enable per-context and per-bb buffers if set") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Matt Roper matthew.d.roper@intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: stable@vger.kernel.org # v4.15+ --- drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 4e856947fb13..703d9ecc3f7e 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1453,6 +1453,9 @@ static int lrc_setup_wa_ctx(struct intel_engine_cs *engine) void lrc_fini_wa_ctx(struct intel_engine_cs *engine) { i915_vma_unpin_and_release(&engine->wa_ctx.vma, 0); + + /* Called on error unwind, clear all flags to prevent further use */ + memset(&engine->wa_ctx, 0, sizeof(engine->wa_ctx)); }
typedef u32 *(*wa_bb_func_t)(struct intel_engine_cs *engine, u32 *batch);
On Fri, Jan 08, 2021 at 03:09:24PM +0000, Chris Wilson wrote:
On error we unpin and free the wa_ctx.vma, but do not clear any of the derived flags. During lrc_init, we look at the flags and attempt to dereference the wa_ctx.vma if they are set. To protect the error path where we try to limp along without the wa_ctx, make sure we clear those flags!
Reported-by: Matt Roper matthew.d.roper@intel.com Fixes: 604a8f6f1e33 ("drm/i915/lrc: Only enable per-context and per-bb buffers if set") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Matt Roper matthew.d.roper@intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Cc: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: stable@vger.kernel.org # v4.15+
Reviewed-by: Matt Roper matthew.d.roper@intel.com
drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 4e856947fb13..703d9ecc3f7e 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1453,6 +1453,9 @@ static int lrc_setup_wa_ctx(struct intel_engine_cs *engine) void lrc_fini_wa_ctx(struct intel_engine_cs *engine) { i915_vma_unpin_and_release(&engine->wa_ctx.vma, 0);
- /* Called on error unwind, clear all flags to prevent further use */
- memset(&engine->wa_ctx, 0, sizeof(engine->wa_ctx));
} typedef u32 *(*wa_bb_func_t)(struct intel_engine_cs *engine, u32 *batch); -- 2.20.1
linux-stable-mirror@lists.linaro.org
-
Chris Wilson -
Matt Roper