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powerpc/powernv: Fix the hmi event version check. 

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.

Cc: stable@vger.kernel.org # 3.17+
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
[mpe: Reword changelog]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Mahesh Salgaonkar 2014-11-20 09:44:36 +05:30 committed by Michael Ellerman
parent d7ce437749
commit 6acbc5a1da
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/powernv/opal-hmi.c
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@ -57,7 +57,7 @@ static void print_hmi_event_info(struct OpalHMIEvent *hmi_evt)
};
/* 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;