[PATCH v6 2/5] powerpc/numa: Handle extra hcall_vphn error cases

[Srikar Dronamraju]

Currently code handles H_FUNCTION, H_SUCCESS, H_HARDWARE return codes.
However hcall_vphn can return other return codes. Now it also handles
H_PARAMETER return code.  Also the rest return codes are handled under the
default case.

Signed-off-by: Srikar Dronamraju <srikar at linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Nathan Lynch <nathanl at linux.ibm.com>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: Abdul Haleem <abdhalee at linux.vnet.ibm.com>
Cc: Satheesh Rajendran <sathnaga at linux.vnet.ibm.com>
Reported-by: Abdul Haleem <abdhalee at linux.vnet.ibm.com>
Reviewed-by: Nathan Lynch <nathanl at linux.ibm.com>
---
Changelog (v2->v1):
 Handled comments from Nathan:
  - Split patch from patch 1.
  - Corrected a problem where I missed calling stop_topology_update().
  - Using pr_err_ratelimited instead of printk.

 arch/powerpc/mm/numa.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 50d68d2..8fbe57c 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1191,23 +1191,30 @@ static long vphn_get_associativity(unsigned long cpu,
 				VPHN_FLAG_VCPU, associativity);
 
 	switch (rc) {
+	case H_SUCCESS:
+		dbg("VPHN hcall succeeded. Reset polling...\n");
+		timed_topology_update(0);
+		goto out;
+
 	case H_FUNCTION:
-		printk_once(KERN_INFO
-			"VPHN is not supported. Disabling polling...\n");
-		stop_topology_update();
+		pr_err_ratelimited("VPHN unsupported. Disabling polling...\n");
 		break;
 	case H_HARDWARE:
-		printk(KERN_ERR
-			"hcall_vphn() experienced a hardware fault "
+		pr_err_ratelimited("hcall_vphn() experienced a hardware fault "
 			"preventing VPHN. Disabling polling...\n");
-		stop_topology_update();
 		break;
-	case H_SUCCESS:
-		dbg("VPHN hcall succeeded. Reset polling...\n");
-		timed_topology_update(0);
+	case H_PARAMETER:
+		pr_err_ratelimited("hcall_vphn() was passed an invalid parameter. "
+			"Disabling polling...\n");
+		break;
+	default:
+		pr_err_ratelimited("hcall_vphn() returned %ld. Disabling polling...\n"
+			, rc);
 		break;
 	}
 
+	stop_topology_update();
+out:
 	return rc;
 }
 
-- 
1.8.3.1