Merge remote-tracking branch 'lsk/v3.10/topic/gator' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / drivers / s390 / cio / chsc.c

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 8ea7d9b2c671a3555c7c5d2c57b505d9f338033c..815e290a1afb158efad74c81c2a2088d505c4f5d 100644 (file)
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -500,18 +500,27 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 
 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 {
-       do {
+       static int ntsm_unsupported;
+
+       while (true) {
                memset(sei, 0, sizeof(*sei));
                sei->request.length = 0x0010;
                sei->request.code = 0x000e;
-               sei->ntsm = ntsm;
+               if (!ntsm_unsupported)
+                       sei->ntsm = ntsm;
 
                if (chsc(sei))
                        break;
 
                if (sei->response.code != 0x0001) {
-                       CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
-                                     sei->response.code);
+                       CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
+                                     sei->response.code, sei->ntsm);
+
+                       if (sei->response.code == 3 && sei->ntsm) {
+                               /* Fallback for old firmware. */
+                               ntsm_unsupported = 1;
+                               continue;
+                       }
                        break;
                }
 
@@ -527,7 +536,10 @@ static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
                        CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
                        break;
                }
-       } while (sei->u.nt0_area.flags & 0x80);
+
+               if (!(sei->u.nt0_area.flags & 0x80))
+                       break;
+       }
 }
 
 /*