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Mon, 23 Feb 2026 22:11:51 +0000 Date: Mon, 23 Feb 2026 14:11:48 -0800 From: Matthew Brost To: Bart Van Assche CC: Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , , Marco Elver , Christoph Hellwig , Steven Rostedt , Nick Desaulniers , "Nathan Chancellor" , Kees Cook , Jann Horn , Bart Van Assche , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , "Himal Prasad Ghimiray" , Maarten Lankhorst Subject: Re: [PATCH 12/62] drm/gpusvm.c: Fix a locking bug in an error path Message-ID: References: <20260223220102.2158611-1-bart.vanassche@linux.dev> <20260223220102.2158611-13-bart.vanassche@linux.dev> Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260223220102.2158611-13-bart.vanassche@linux.dev> X-ClientProxiedBy: MW4PR03CA0084.namprd03.prod.outlook.com (2603:10b6:303:b6::29) To PH7PR11MB6522.namprd11.prod.outlook.com (2603:10b6:510:212::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR11MB6522:EE_|CH0PR11MB5249:EE_ X-MS-Office365-Filtering-Correlation-Id: e1f21356-1034-43c5-2aa0-08de73288bed X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014; 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This has been detected by the Clang thread-safety > analyzer. Compile-tested only. > > Cc: Thomas Hellström > Cc: Matthew Brost > Cc: Himal Prasad Ghimiray > Cc: Maarten Lankhorst > Fixes: f1d08a586482 ("drm/gpusvm: Introduce a function to scan the current migration state") > Signed-off-by: Bart Van Assche > --- > drivers/gpu/drm/drm_gpusvm.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c > index 24180bfdf5a2..e9b79ab2f83c 100644 > --- a/drivers/gpu/drm/drm_gpusvm.c > +++ b/drivers/gpu/drm/drm_gpusvm.c > @@ -819,7 +819,7 @@ enum drm_gpusvm_scan_result drm_gpusvm_scan_mm(struct drm_gpusvm_range *range, > > if (!(pfns[i] & HMM_PFN_VALID)) { > state = DRM_GPUSVM_SCAN_UNPOPULATED; > - goto err_free; > + goto unlock; Indeed a problem but we have this fixed in drm-tip. git format-patch -1 d287dee565c3c 'drm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm' Not sure which tree you are in but this should propagate up to Linus during the 7.0 cycle. Matt > } > > page = hmm_pfn_to_page(pfns[i]); > @@ -856,9 +856,10 @@ enum drm_gpusvm_scan_result drm_gpusvm_scan_mm(struct drm_gpusvm_range *range, > i += 1ul << drm_gpusvm_hmm_pfn_to_order(pfns[i], i, npages); > } > > -err_free: > +unlock: > drm_gpusvm_notifier_unlock(range->gpusvm); > > +err_free: > kvfree(pfns); > return state; > }