linux-kernel - [PATCH] x86: check function status in EDD boot code

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Date:	Fri, 18 Jul 2008 13:35:37 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: check function status in EDD boot code

Without checking the return value of get_edd_info() and adding the
entry only in the success case, 6 devices show up under
/sys/firmware/edd/, no matter how many devices are actually present.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/boot/edd.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- linux-2.6.26/arch/x86/boot/edd.c	2008-07-13 23:51:29.000000000 +0200
+++ 2.6.26-x86-edd/arch/x86/boot/edd.c	2008-07-15 19:20:52.000000000 +0200
@@ -167,9 +167,8 @@ void query_edd(void)
 		 * Scan the BIOS-supported hard disks and query EDD
 		 * information...
 		 */
-		get_edd_info(devno, &ei);
-
-		if (boot_params.eddbuf_entries < EDDMAXNR) {
+		if (!get_edd_info(devno, &ei)
+		    && boot_params.eddbuf_entries < EDDMAXNR) {
 			memcpy(edp, &ei, sizeof ei);
 			edp++;
 			boot_params.eddbuf_entries++;



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