linux-kernel - RE: [PATCH 2/4] drm/amdgpu: use new ww_mutex_is_owned_by function

Open Source and information security mailing list archives

Date:   Fri, 23 Feb 2018 09:48:33 +0000
From:   "He, Roger" <Hongbo.He@....com>
To:     Christian König 
        <ckoenig.leichtzumerken@...il.com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/4] drm/amdgpu: use new ww_mutex_is_owned_by function


Reviewed-by: Roger He <Hongbo.He@....com>

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces@...ts.freedesktop.org] On Behalf Of Christian K?nig
Sent: Tuesday, February 20, 2018 8:58 PM
To: amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] drm/amdgpu: use new ww_mutex_is_owned_by function

Instead of accessing ww_mutex internals directly use the provided function to check if the ww_mutex was indeed locked by the current command submission.

Signed-off-by: Christian König <christian.koenig@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index eaa3cb0c3ad1..6db26a3144dc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1594,7 +1594,7 @@ int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,
 	*map = mapping;
 
 	/* Double check that the BO is reserved by this CS */
-	if (READ_ONCE((*bo)->tbo.resv->lock.ctx) != &parser->ticket)
+	if (!ww_mutex_is_owned_by(&(*bo)->tbo.resv->lock, &parser->ticket))
 		return -EINVAL;
 
 	if (!((*bo)->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)) {
--
2.14.1

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