linux-kernel - [PATCH] ACPI/CPC: Don't try to clean up uninitialized CPC data

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Message-Id: <1481913346-16321-1-git-send-email-boris.ostrovsky@oracle.com>
Date:   Fri, 16 Dec 2016 13:35:46 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     rjw@...ysocki.net, lenb@...nel.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH] ACPI/CPC: Don't try to clean up uninitialized CPC data

If acpi_cppc_processor_probe() had not executed successfully (for
example, if _CPC object was not found) then cpc_desc_ptr for that
processor will be invalid.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
---
 drivers/acpi/cppc_acpi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index d0d0504..5bba26e 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -824,6 +824,8 @@ void acpi_cppc_processor_exit(struct acpi_processor *pr)
 	void __iomem *addr;
 
 	cpc_ptr = per_cpu(cpc_desc_ptr, pr->id);
+	if (!cpc_ptr)
+		return;
 
 	/* Free all the mapped sys mem areas for this CPU */
 	for (i = 2; i < cpc_ptr->num_entries; i++) {
-- 
1.8.3.1