From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Aleksi Torhamo , Roy Spliet , Ben Skeggs Subject: [ 169/221] drm/nvc0/fb: fix crash when different mutex is used to protect same list Date: Tue, 15 Jan 2013 10:51:36 -0800 Message-Id: <20130115185010.240198388@linuxfoundation.org> In-Reply-To: <20130115184958.025580322@linuxfoundation.org> References: <20130115184958.025580322@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aleksi Torhamo commit 43f789792e2c7ea2bff37195e4c4b4239e9e02b7 upstream. Fixes regression introduced in commit 861d2107 "drm/nouveau/fb: merge fb/vram and port to subdev interfaces" nv50_fb_vram_{new,del} functions were changed to use nouveau_subdev->mutex instead of the old nouveau_mm->mutex. nvc0_fb_vram_new still uses the nouveau_mm->mutex, but nvc0 doesn't have its own fb_vram_del function, using nv50_fb_vram_del instead. Because of this, on nvc0 a different mutex ends up being used to protect additions and deletions to the same list. This patch is a -stable candidate for 3.7. Signed-off-by: Aleksi Torhamo Reported-by: Roy Spliet Tested-by: Roy Spliet Signed-off-by: Ben Skeggs Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c +++ b/drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c @@ -86,14 +86,14 @@ nvc0_fb_vram_new(struct nouveau_fb *pfb, mem->memtype = type; mem->size = size; - mutex_lock(&mm->mutex); + mutex_lock(&pfb->base.mutex); do { if (back) ret = nouveau_mm_tail(mm, 1, size, ncmin, align, &r); else ret = nouveau_mm_head(mm, 1, size, ncmin, align, &r); if (ret) { - mutex_unlock(&mm->mutex); + mutex_unlock(&pfb->base.mutex); pfb->ram.put(pfb, &mem); return ret; } @@ -101,7 +101,7 @@ nvc0_fb_vram_new(struct nouveau_fb *pfb, list_add_tail(&r->rl_entry, &mem->regions); size -= r->length; } while (size); - mutex_unlock(&mm->mutex); + mutex_unlock(&pfb->base.mutex); r = list_first_entry(&mem->regions, struct nouveau_mm_node, rl_entry); mem->offset = (u64)r->offset << 12;