linux-kernel - [Patch v2] firmware: dmi_scan: fix dmi scan to handle "End of Table" structure

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Date:	Wed,  4 Feb 2015 16:22:05 +0200
From:	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:	linux-kernel@...r.kernel.org, matt.fleming@...el.com,
	ard.biesheuvel@...aro.org
Cc:	leif.lindholm@...aro.org,
	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [Patch v2] firmware: dmi_scan: fix dmi scan to handle "End of Table" structure

The dmi-sysfs should create "End of Table" entry, that is type 127.
But after adding initial SMBIOS v3 support the 127-0 entry is not
handled any more, as result it's not created in sysfs.
This is important because the size of whole DMI table must correspond
to sum of all DMI entry sizes.

So move "end-of-table" check after it's handled by decode.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---

v2..v1:
	Move end of table check after it's handled instead of removing
	Correct commit

 drivers/firmware/dmi_scan.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index c5f7b4e..a44b87c 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -93,12 +93,6 @@ static void dmi_table(u8 *buf, int len, int num,
 		const struct dmi_header *dm = (const struct dmi_header *)data;
 
 		/*
-		 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
-		 */
-		if (dm->type == DMI_ENTRY_END_OF_TABLE)
-			break;
-
-		/*
 		 *  We want to know the total length (formatted area and
 		 *  strings) before decoding to make sure we won't run off the
 		 *  table in dmi_decode or dmi_string
@@ -108,6 +102,13 @@ static void dmi_table(u8 *buf, int len, int num,
 			data++;
 		if (data - buf < len - 1)
 			decode(dm, private_data);
+
+		/*
+		 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
+		 */
+		if (dm->type == DMI_ENTRY_END_OF_TABLE)
+			break;
+
 		data += 2;
 		i++;
 	}
-- 
1.9.1

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