linux-kernel - [PATCH] tpm: fix tpm_acpi sparse warning on different address spaces

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Message-ID: <20120830143839.GA9589@linux.vnet.ibm.com>
Date:	Thu, 30 Aug 2012 09:38:41 -0500
From:	Kent Yoder <key@...ux.vnet.ibm.com>
To:	James Morris <jmorris@...ei.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net, kernel-janitors@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH] tpm: fix tpm_acpi sparse warning on different address spaces

acpi_os_map_memory expects its return value to be in the __iomem address
space. Cast it back later when used in a memcpy to avoid the same sparse
warning there.

Signed-off-by: Kent Yoder <key@...ux.vnet.ibm.com>
---
 drivers/char/tpm/tpm_acpi.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c
index fe3fa94..36bdcfa 100644
--- a/drivers/char/tpm/tpm_acpi.c
+++ b/drivers/char/tpm/tpm_acpi.c
@@ -49,7 +49,7 @@ int read_log(struct tpm_bios_log *log)
 {
 	struct acpi_tcpa *buff;
 	acpi_status status;
-	struct acpi_table_header *virt;
+	void __iomem *virt;
 	u64 len, start;
 
 	if (log->bios_event_log != NULL) {
@@ -102,7 +102,7 @@ int read_log(struct tpm_bios_log *log)
 		return -EIO;
 	}
 
-	memcpy(log->bios_event_log, virt, len);
+	memcpy(log->bios_event_log, (void *)virt, len);
 
 	acpi_os_unmap_memory(virt, len);
 	return 0;
-- 
1.7.5.4

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