linux-kernel - [PATCH 3.17 049/122] powerpc/powernv: Fix the hmi event version check.

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Date:	Fri,  5 Dec 2014 14:43:43 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 3.17 049/122] powerpc/powernv: Fix the hmi event version check.

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>

commit 6acbc5a1dab30aa8f7be7bf3852f343f89147ac5 upstream.

The current HMI event structure is an ABI and carries a version field to
accommodate future changes without affecting/rearranging current structure
members that are valid for previous versions.

The current version check "if (hmi_evt->version != OpalHMIEvt_V1)"
doesn't accomodate the fact that the version number may change in
future.

If firmware starts returning an HMI event with version > 1, this check
will fail and no HMI information will be printed on older kernels.

This patch fixes this issue.

Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
[mpe: Reword changelog]
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/powernv/opal-hmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/powernv/opal-hmi.c
+++ b/arch/powerpc/platforms/powernv/opal-hmi.c
@@ -57,7 +57,7 @@ static void print_hmi_event_info(struct
 	};
 
 	/* Print things out */
-	if (hmi_evt->version != OpalHMIEvt_V1) {
+	if (hmi_evt->version < OpalHMIEvt_V1) {
 		pr_err("HMI Interrupt, Unknown event version %d !\n",
 			hmi_evt->version);
 		return;


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