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drm/i915/guc: Fix a memory leak where guc->execbuf_client is not freed

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During driver unloading, the guc_client created for command submission
needs to be released to avoid memory leak.

The struct_mutex needs to be held before tearing down GuC.

v1: Move i915_guc_submission_disable out of i915_guc_submission_fini and
    take struct_mutex lock before release GuC client. (Dave Gordon)
v2: Add the locking for failure case in guc_fw_fetch. (Dave Gordon)
    Add i915_guc_submission_fini for failure case in intel_guc_ucode_load.

Signed-off-by: Alex Dai <yu.dai@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452711710-4505-1-git-send-email-yu.dai@intel.com
This commit is contained in:
Alex Dai 2016-01-13 11:01:50 -08:00 committed by Tvrtko Ursulin
parent 82352e908a
commit a9d8adad73
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/intel_guc_loader.c
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@ -445,6 +445,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
direct_interrupts_to_host(dev_priv);
i915_guc_submission_disable(dev);
i915_guc_submission_fini(dev);
return err;
}
@ -561,10 +562,12 @@ static void guc_fw_fetch(struct drm_device *dev, struct intel_guc_fw *guc_fw)
DRM_ERROR("Failed to fetch GuC firmware from %s (error %d)\n",
guc_fw->guc_fw_path, err);
mutex_lock(&dev->struct_mutex);
obj = guc_fw->guc_fw_obj;
if (obj)
drm_gem_object_unreference(&obj->base);
guc_fw->guc_fw_obj = NULL;
mutex_unlock(&dev->struct_mutex);
release_firmware(fw); /* OK even if fw is NULL */
guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_FAIL;
@ -631,10 +634,11 @@ void intel_guc_ucode_fini(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
mutex_lock(&dev->struct_mutex);
direct_interrupts_to_host(dev_priv);
i915_guc_submission_disable(dev);
i915_guc_submission_fini(dev);
mutex_lock(&dev->struct_mutex);
if (guc_fw->guc_fw_obj)
drm_gem_object_unreference(&guc_fw->guc_fw_obj->base);
guc_fw->guc_fw_obj = NULL;