[Intel-gfx] [PATCH v5 1/2] drm/i915: Fix failure paths around initial fbdev allocation

[Lukas Wunner]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

We had two failure modes here:

1.
Deadlock in intelfb_alloc failure path where it calls
drm_framebuffer_remove, which grabs the struct mutex and intelfb_create
(caller of intelfb_alloc) was already holding it.

2.
Deadlock in intelfb_create failure path where it calls
drm_framebuffer_unreference, which grabs the struct mutex and
intelfb_create was already holding it.

v2:
   * Reformat commit msg to 72 chars. (Lukas Wunner)
   * Add third failure mode. (Lukas Wunner)

v3:
   * On fb alloc failure, unref gem object where it gets refed,
     fix double unref in separate commit. (Ville Syrjälä)

v4:
   * Lock struct mutex on unref. (Chris Wilson)

v5:
   * Rebase on drm-intel-nightly 2015y-09m-04d-08h-19m-35s UTC,
     rephrase commit message. (Jani Nicula)

Tested-by: Pierre Moreau <pierre.morrow at free.fr>
    [MBP  5,3 2009  nvidia 9400M + 9600M GT   pre-retina]
Tested-by: Paul Hordiienko <pvt.gord at gmail.com>
    [MBP  6,2 2010  intel ILK + nvidia GT216  pre-retina]
Tested-by: William Brown <william at blackhats.net.au>
    [MBP  8,2 2011  intel SNB + amd turks     pre-retina]
Tested-by: Lukas Wunner <lukas at wunner.de>
    [MBP  9,1 2012  intel IVB + nvidia GK107  pre-retina]
Tested-by: Bruno Bierbaumer <bruno at bierbaumer.net>
    [MBP 11,3 2013  intel HSW + nvidia GK107  retina]

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Fixes: 60a5ca015ffd ("drm/i915: Add locking around
    framebuffer_references--")
Reported-by: Lukas Wunner <lukas at wunner.de>
[Lukas: Create v3 + v4 + v5 based on Tvrtko's v2]
Signed-off-by: Lukas Wunner <lukas at wunner.de>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/intel_fbdev.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 96476d7..eee3306 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -119,7 +119,7 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 {
 	struct intel_fbdev *ifbdev =
 		container_of(helper, struct intel_fbdev, helper);
-	struct drm_framebuffer *fb;
+	struct drm_framebuffer *fb = NULL;
 	struct drm_device *dev = helper->dev;
 	struct drm_mode_fb_cmd2 mode_cmd = {};
 	struct drm_i915_gem_object *obj;
@@ -137,6 +137,8 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 							  sizes->surface_depth);
 
+	mutex_lock(&dev->struct_mutex);
+
 	size = mode_cmd.pitches[0] * mode_cmd.height;
 	size = PAGE_ALIGN(size);
 	obj = i915_gem_object_create_stolen(dev, size);
@@ -158,18 +160,21 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
 	ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL, NULL);
 	if (ret) {
 		DRM_ERROR("failed to pin obj: %d\n", ret);
-		goto out_fb;
+		goto out_unref;
 	}
 
+	mutex_unlock(&dev->struct_mutex);
+
 	ifbdev->fb = to_intel_framebuffer(fb);
 
 	return 0;
 
-out_fb:
-	drm_framebuffer_remove(fb);
 out_unref:
 	drm_gem_object_unreference(&obj->base);
 out:
+	mutex_unlock(&dev->struct_mutex);
+	if (fb)
+		drm_framebuffer_remove(fb);
 	return ret;
 }
 
@@ -187,8 +192,6 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	int size, ret;
 	bool prealloc = false;
 
-	mutex_lock(&dev->struct_mutex);
-
 	if (intel_fb &&
 	    (sizes->fb_width > intel_fb->base.width ||
 	     sizes->fb_height > intel_fb->base.height)) {
@@ -203,7 +206,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 		DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 		ret = intelfb_alloc(helper, sizes);
 		if (ret)
-			goto out_unlock;
+			return ret;
 		intel_fb = ifbdev->fb;
 	} else {
 		DRM_DEBUG_KMS("re-using BIOS fb\n");
@@ -215,6 +218,8 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	obj = intel_fb->obj;
 	size = obj->base.size;
 
+	mutex_lock(&dev->struct_mutex);
+
 	info = drm_fb_helper_alloc_fbi(helper);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
@@ -276,7 +281,6 @@ out_destroy_fbi:
 out_unpin:
 	i915_gem_object_ggtt_unpin(obj);
 	drm_gem_object_unreference(&obj->base);
-out_unlock:
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }
-- 
2.1.0