ARM: 7476/1: vfp: only clear vfp state for current cpu in vfp_pm_suspend

colincross · Russell King · commit a84b895a2348 · 2012-07-31T10:30:42.000+01:00
vfp_pm_suspend runs on each cpu, only clear the hardware state
pointer for the current cpu.  Prevents a possible crash if one
cpu clears the hw state pointer when another cpu has already
checked if it is valid.

Cc: stable@vger.kernel.org
Signed-off-by: Colin Cross &lt;ccross@android.com&gt;
Signed-off-by: Russell King &lt;rmk+kernel@arm.linux.org.uk&gt;
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
@@ -460,7 +460,7 @@ static int vfp_pm_suspend(void)
 	}
 
 	/* clear any information we had about last context state */
-	memset(vfp_current_hw_state, 0, sizeof(vfp_current_hw_state));
+	vfp_current_hw_state[ti->cpu] = NULL;
 
 	return 0;
 }

Original file line number	Diff line number	Diff line change
`@@ -460,7 +460,7 @@ static int vfp_pm_suspend(void)`
`460`	`460`	`}`
`461`	`461`
`462`	`462`	`/* clear any information we had about last context state */`
`463`		`- memset(vfp_current_hw_state, 0, sizeof(vfp_current_hw_state));`
	`463`	`+ vfp_current_hw_state[ti->cpu] = NULL;`
`464`	`464`
`465`	`465`	`return 0;`
`466`	`466`	`}`