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Thu, 8 Feb 2024 13:59:09 +0000 Message-ID: <21166026-22ea-4bc3-b1e0-d8896f5820ad@amd.com> Date: Thu, 8 Feb 2024 07:59:06 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/buddy: Fix alloc_range() error handling code To: Arunpravin Paneer Selvam , =?UTF-8?Q?Christian_K=C3=B6nig?= , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: alexander.deucher@amd.com, matthew.auld@intel.com References: <20240207174456.341121-1-Arunpravin.PaneerSelvam@amd.com> <07ed1fee-cb73-49ba-bef6-ca16b4c808e4@amd.com> <86b5d704-9e0d-b989-1469-665e41d9b342@amd.com> Content-Language: en-US From: Mario Limonciello In-Reply-To: <86b5d704-9e0d-b989-1469-665e41d9b342@amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SN7PR04CA0087.namprd04.prod.outlook.com (2603:10b6:806:121::32) To MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN0PR12MB6101:EE_|IA1PR12MB6188:EE_ X-MS-Office365-Filtering-Correlation-Id: d80fff14-3fe9-44d9-26d1-08dc28ae1f0d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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We have root >>> caused the problem that whenever alloc_range() couldn't >>> find the required memory blocks the function was returning >>> SUCCESS in some of the corner cases. >>> >>> The right approach would be if the total allocated size >>> is less than the required size, the function should >>> return -ENOSPC. >>> >>> Gitlab ticket link - >>> https://gitlab.freedesktop.org/drm/amd/-/issues/3097 Syntax should be "Closes: $URL" >>> Fixes: 0a1844bf0b53 ("drm/buddy: Improve contiguous memory allocation") >>> Signed-off-by: Arunpravin Paneer Selvam >>> >>> Tested-by: Mario Limonciello >> >> Acked-by: Christian König >> >> CC: stable.. ? > I will check and add the stable kernel version. Should be 6.7. > > Thanks, > Arun. >> >>> --- >>>   drivers/gpu/drm/drm_buddy.c | 6 ++++++ >>>   1 file changed, 6 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c >>> index f57e6d74fb0e..c1a99bf4dffd 100644 >>> --- a/drivers/gpu/drm/drm_buddy.c >>> +++ b/drivers/gpu/drm/drm_buddy.c >>> @@ -539,6 +539,12 @@ static int __alloc_range(struct drm_buddy *mm, >>>       } while (1); >>>         list_splice_tail(&allocated, blocks); >>> + >>> +    if (total_allocated < size) { >>> +        err = -ENOSPC; >>> +        goto err_free; >>> +    } >>> + >>>       return 0; >>>     err_undo: >> >