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platform/x86/amd/pmf: Initialize and clean up cb_mutex

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`cb_mutex` was introduced in commit 9e0894d070 ("platform/x86/amd/pmf:
Enable Custom BIOS Inputs for PMF-TA") to prevent conccurrent access for
BIOS inputs. It however isn't initialized and so on use it may lead to
a NULL pointer dereference.

Add code to initialize on probe and clean up on destroy.

Reported-by: Yijun Shen <Yijun.Shen@dell.com>
Cc: Richard Gong <richgong@amd.com>
Fixes: 9e0894d070 ("platform/x86/amd/pmf: Enable Custom BIOS Inputs for PMF-TA")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-By: Yijun Shen <Yijun_Shen@Dell.com>
Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20250227170308.435862-1-superm1@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Mario Limonciello 2025-02-27 11:03:06 -06:00 committed by Ilpo Järvinen
parent b3e127daca
commit 1be4e29e94
No known key found for this signature in database
GPG Key ID: 59AC4F6153E5CE31
1 changed files with 2 additions and 0 deletions
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2
drivers/platform/x86/amd/pmf/core.c
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@ -452,6 +452,7 @@ static int amd_pmf_probe(struct platform_device *pdev)
mutex_init(&dev->lock);
mutex_init(&dev->update_mutex);
mutex_init(&dev->cb_mutex);
apmf_acpi_init(dev);
platform_set_drvdata(pdev, dev);
@ -477,6 +478,7 @@ static void amd_pmf_remove(struct platform_device *pdev)
amd_pmf_dbgfs_unregister(dev);
mutex_destroy(&dev->lock);
mutex_destroy(&dev->update_mutex);
mutex_destroy(&dev->cb_mutex);
kfree(dev->buf);
}