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Thu, 8 Feb 2024 06:57:09 +0000 Message-ID: <07ed1fee-cb73-49ba-bef6-ca16b4c808e4@amd.com> Date: Thu, 8 Feb 2024 07:57:04 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/buddy: Fix alloc_range() error handling code Content-Language: en-US To: Arunpravin Paneer Selvam , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: alexander.deucher@amd.com, matthew.auld@intel.com, mario.limonciello@amd.com References: <20240207174456.341121-1-Arunpravin.PaneerSelvam@amd.com> From: =?UTF-8?Q?Christian_K=C3=B6nig?= In-Reply-To: <20240207174456.341121-1-Arunpravin.PaneerSelvam@amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: FR3P281CA0019.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1c::6) To PH7PR12MB5685.namprd12.prod.outlook.com (2603:10b6:510:13c::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR12MB5685:EE_|BN9PR12MB5227:EE_ X-MS-Office365-Filtering-Correlation-Id: 5ae49fc6-5ae0-4cda-8c7f-08dc28732b06 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 > Fixes: 0a1844bf0b53 ("drm/buddy: Improve contiguous memory allocation") > Signed-off-by: Arunpravin Paneer Selvam > Tested-by: Mario Limonciello Acked-by: Christian König CC: stable.. ? > --- > 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: