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platform/x86/amd/hsmp: Clear mdev.this_device on deregister

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misc_deregister() destroys the device but leaves miscdevice.this_device
pointing at the freed struct device. Clear it so any later check of
this_device, and a subsequent re-register, does not observe a stale
pointer. An upcoming change uses this_device to track whether /dev/hsmp is
registered across the shared ACPI sockets and relies on it being NULL after
deregister.

Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Link: https://patch.msgid.link/20260723094656.3806028-5-muralidhara.mk@amd.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Muralidhara M K 2026-07-23 15:16:54 +05:30 committed by Ilpo Järvinen
parent 8da4fedd5d
commit 6bd243d5ab
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1 changed files with 1 additions and 0 deletions
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drivers/platform/x86/amd/hsmp/hsmp.c
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@ -539,6 +539,7 @@ EXPORT_SYMBOL_NS_GPL(hsmp_misc_register, "AMD_HSMP");
void hsmp_misc_deregister(void)
{
misc_deregister(&hsmp_pdev.mdev);
hsmp_pdev.mdev.this_device = NULL;
}
EXPORT_SYMBOL_NS_GPL(hsmp_misc_deregister, "AMD_HSMP");