platform/x86/amd/pmc: Restore msg_port on amd_stb_s2d_init() error paths

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dev->msg_port is switched to MSG_PORT_S2D before issuing the S2D SMU
commands but is only restored to MSG_PORT_PMC on the success path.  The
early "return -EIO" and "return -ENOMEM" leave the port stuck on
MSG_PORT_S2D, so all subsequent SMU communication - including the s2idle
prepare/restore handlers - is directed at the wrong mailbox.

Consolidate the exit path through a single label so the message port is
always restored.

Fixes: 3d7d407dfb ("platform/x86: amd-pmc: Add support for AMD Spill to DRAM STB feature")
Cc: stable@vger.kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20260721181756.143084-2-mario.limonciello@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Mario Limonciello 2026-07-21 13:17:51 -05:00 • committed by Ilpo Järvinen

parent c7acedb2db

commit 9cef693bce

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1 changed files with 15 additions and 9 deletions

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drivers/platform/x86/amd/pmc/mp1_stb.c

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