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Tue, 26 Nov 2024 22:21:01 -0800 From: Kartik Rajput To: , , , , Subject: [PATCH] mailbox: tegra-hsp: Clear mailbox before using message Date: Wed, 27 Nov 2024 11:50:53 +0530 Message-ID: <20241127062053.19165-1-kkartik@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000009:EE_|SJ2PR12MB8956:EE_ X-MS-Office365-Filtering-Correlation-Id: 0acb7ec6-5df8-4642-9a9c-08dd0eabb4e4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?nOkr809UvFcqo8MuZWu8zIRApWlVrAPeJm1fNEF9Q79p97UVlN5CxpFCQEH1?= =?us-ascii?Q?AusKiVpj2gUibL/cVxEQy1KWuU9+7D0jGgSzn3rqG9rVKN41Vq119iu/IeYz?= =?us-ascii?Q?Nm+YghnNj7oHNwouo3ujTTonfDVqBMv6pEoYBJp0Sia1qP8ImleOST/8IiVH?= =?us-ascii?Q?PTTbp9M+0lZYEc5F5TjXBmAMba8UegMMP/qN/7llM0N9FQ5X13a66CKQsIJv?= =?us-ascii?Q?e5AK2PGCsTYopDLN+CWmWV+QoWsd/NBu51NvEUPZNDmHAPzxet3KWPFDPkV/?= =?us-ascii?Q?qvERT/EiZ0a2ercdJxMdt3kc3uS2io3QuAdszIHcp9VOT46ul2sr6C0pE6ex?= =?us-ascii?Q?WoF9QoE1DYzpYbgz+AIWcQyDxpESdRCHV9Y2RE2E3mUx8NXakkfj2qds25TE?= =?us-ascii?Q?UZxm+Pgy91SbvQuZUmgelt3tKGfBX7Z49dvbTiqKc4brpMG0xn19QOi90Z/g?= =?us-ascii?Q?hhHppb/SD2Eh4upuTn3cApuBziOhHQBUNRFi/AbjwNBUE+rBqkG5U8tVBrUY?= =?us-ascii?Q?pRP4ojx9edgV+t4zNYgv4p/MOAv4I8C7Q3/7dZpntkY1GeXGiKiYmz0a7XYi?= =?us-ascii?Q?YuRabzvawWWZyGj1B4dNGoVOJQmPmkKBXgfM50dLw738uDGIrJLSdR45wsbd?= =?us-ascii?Q?4C3teOK18GMk5+In26109L8u7h2XQP9OhHNX0czwMeFoED1/Iv3tJ9P+mqDu?= =?us-ascii?Q?9phPa4vhxYJ4HFyqtghOVRa2W8cs/fFaXaAnQenEsxu2IxGrQS9tWLAK4/T/?= =?us-ascii?Q?kzoXoIxvgePoKHSxprEo4rsT23E6JiCG241tOrRz5F2khvIwVdHNa+Jvp39U?= =?us-ascii?Q?L8Cb6KgY1d3Yi8gbiFJQHn3tS4R/hZGqVX+GyCaTo2rrBRDLv2nM+2A72+tI?= =?us-ascii?Q?uN/6/M5jR6IH4I5I9FeaSkoDtJMz7J9CoQd6t1zskFFi98qGpX8OHJggUQus?= =?us-ascii?Q?vwz9Vk8ieYcwjBnuZYqbic99HMsbBN2hNMZmAqVWZFMdk/gDThbDwqSsRrea?= =?us-ascii?Q?NgaA4BXLvU++C/z6MIm9Mf3rFE3IVB7U+ZCFYbjDIEDiyuGsg3R6PM2C7PY4?= =?us-ascii?Q?HRq8OnYxgCYTA9Wx9nrnTEeUmm+5DlVVk1WNplFBwrD42FFVdbgYPPtrugaA?= =?us-ascii?Q?sFhkwsvdFrAucxFbQ7sMztqn8fS5zQjj9E1N49Pb3og4pesI9bu+QwRTFLdi?= =?us-ascii?Q?n7hdUCuBDHyIoMFHMCyzH5XlhWmy/d1d0vKCMg7+W/ITPJg4ZYvhE5c6Lrx6?= =?us-ascii?Q?bNDRDGY6s3BtgZG/H3cg0wx9/C/n183s63xHe5zH8mQXpVtisDd0BC0TbFTK?= =?us-ascii?Q?7kVCQl7ThpT0vcDoDgXes0mxXZwAcl2TEghWUjek+BbOJMnBtVwcthLpSzKN?= =?us-ascii?Q?B889X7Zz288ZPDBEMTMy8tQ1lVBcLSUkpX39Bf2wPJFL72LrtcaZF3D6V3OT?= =?us-ascii?Q?QfxEn7lU/iYvb9frcUPcASd3uzfODzmT?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(82310400026)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2024 06:21:19.1993 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0acb7ec6-5df8-4642-9a9c-08dd0eabb4e4 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000009.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8956 Content-Type: text/plain; charset="utf-8" From: Pekka Pessi Some clients depend on mailbox being empty before processing the message. On RT kernel, the thread processing the message may be on different CPU or running with higher priority than the interrupt handler thread and they may act on the message before mailbox is emptied. Signed-off-by: Pekka Pessi Signed-off-by: Kartik Rajput --- drivers/mailbox/tegra-hsp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c index 8d5e2d7dc03b..9c09858edee7 100644 --- a/drivers/mailbox/tegra-hsp.c +++ b/drivers/mailbox/tegra-hsp.c @@ -388,7 +388,6 @@ static void tegra_hsp_sm_recv32(struct tegra_hsp_channe= l *channel) value =3D tegra_hsp_channel_readl(channel, HSP_SM_SHRD_MBOX); value &=3D ~HSP_SM_SHRD_MBOX_FULL; msg =3D (void *)(unsigned long)value; - mbox_chan_received_data(channel->chan, msg); =20 /* * Need to clear all bits here since some producers, such as TCU, depend @@ -398,6 +397,8 @@ static void tegra_hsp_sm_recv32(struct tegra_hsp_channe= l *channel) * explicitly, so we have to make sure we cover all possible cases. */ tegra_hsp_channel_writel(channel, 0x0, HSP_SM_SHRD_MBOX); + + mbox_chan_received_data(channel->chan, msg); } =20 static const struct tegra_hsp_sm_ops tegra_hsp_sm_32bit_ops =3D { --=20 2.47.0