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authorSebastian Ott <sebott@linux.vnet.ibm.com>2014-04-15 20:08:01 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-04-17 12:46:28 +0200
commit06cd7a874ec6e09d151aeb1fa8600e14f1ff89f6 (patch)
treee2f21d343565c0b9445b0d139a1b016d048921d7 /drivers/s390/cio
parent6ca2a88ad820af56535ed1e6936e0490cb6ec6dc (diff)
s390/chsc: fix SEI usage on old FW levels
Using a notification type mask for the store event information chsc is unsupported on some firmware levels. Retry SEI with that mask set to zero (which is the old way of requesting only channel subsystem related events). Cc: <stable@vger.kernel.org> Reported-and-tested-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
-rw-r--r--drivers/s390/cio/chsc.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 9f0ea6cb6922..e3bf885f4a6c 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -541,18 +541,27 @@ 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;
}
@@ -568,7 +577,10 @@ 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;
+ }
}
/*