From 0d4b78b3d2c0cb570abe086bce8c17ea3c474095 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 1 May 2018 08:52:03 +0100 Subject: [PATCH] drm/i915/guc: Assert we have the doorbell before setting it up MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit As our early doorbell is split between early allocation and a late setup after we have a channel to the GuC, it may happen due to a lapse of programmer judgement that we try to setup an invalid doorbell. Make use of our has_doorbell() function to check the doorbell does exist for the client before we try and tell the guc about it. In doing so, we prevent the compiler from warning about the otherwise unused function in some configurations. Reported-by: Matthias Kaehlcke Signed-off-by: Chris Wilson Cc: Daniele Ceraolo Spurio Cc: Michał Winiarski Cc: Michal Wajdeczko Cc: Michel Thierry Reviewed-by: Michel Thierry Link: https://patchwork.freedesktop.org/patch/msgid/20180501075203.12458-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_guc_submission.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c index 6e6ed0f..c6bb5be 100644 --- a/drivers/gpu/drm/i915/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/intel_guc_submission.c @@ -124,9 +124,17 @@ static int reserve_doorbell(struct intel_guc_client *client) return 0; } +static bool has_doorbell(struct intel_guc_client *client) +{ + if (client->doorbell_id == GUC_DOORBELL_INVALID) + return false; + + return test_bit(client->doorbell_id, client->guc->doorbell_bitmap); +} + static void unreserve_doorbell(struct intel_guc_client *client) { - GEM_BUG_ON(client->doorbell_id == GUC_DOORBELL_INVALID); + GEM_BUG_ON(!has_doorbell(client)); __clear_bit(client->doorbell_id, client->guc->doorbell_bitmap); client->doorbell_id = GUC_DOORBELL_INVALID; @@ -184,14 +192,6 @@ static struct guc_doorbell_info *__get_doorbell(struct intel_guc_client *client) return client->vaddr + client->doorbell_offset; } -static bool has_doorbell(struct intel_guc_client *client) -{ - if (client->doorbell_id == GUC_DOORBELL_INVALID) - return false; - - return test_bit(client->doorbell_id, client->guc->doorbell_bitmap); -} - static void __create_doorbell(struct intel_guc_client *client) { struct guc_doorbell_info *doorbell; @@ -207,7 +207,6 @@ static void __destroy_doorbell(struct intel_guc_client *client) struct guc_doorbell_info *doorbell; u16 db_id = client->doorbell_id; - doorbell = __get_doorbell(client); doorbell->db_status = GUC_DOORBELL_DISABLED; doorbell->cookie = 0; @@ -224,6 +223,9 @@ static int create_doorbell(struct intel_guc_client *client) { int ret; + if (WARN_ON(!has_doorbell(client))) + return -ENODEV; /* internal setup error, should never happen */ + __update_doorbell_desc(client, client->doorbell_id); __create_doorbell(client); -- 2.7.4