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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2022 22:09:20.2499 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b88c5a6b-ed1e-45de-7831-08d9fc994d18 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT044.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR12MB3524 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Switches might not have a uid set if the DROM read failed during initialization previously. Normally upon resume the uid is re-read to confirm it's the same device connected. * If the DROM read failed during init but then succeeded during resume it could either be a new device or faulty device * If the DROM read failed during init and also failed during resume it might be a different device plugged in all together. Detect this situation and prevent re-using the same configuration in these cirucmstances. Signed-off-by: Mario Limonciello --- drivers/thunderbolt/switch.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index b5fb3e76ed09..294518af4ee4 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -2980,6 +2980,10 @@ int tb_switch_resume(struct tb_switch *sw) return err; } + /* We don't have any way to confirm this was the same device */ + if (!sw->uid) + return -ENODEV; + if (tb_switch_is_usb4(sw)) err = usb4_switch_read_uid(sw, &uid); else -- 2.34.1