This is a note to let you know that I've just added the patch titled
s390/chsc: fix SEI usage on old FW levels
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-chsc-fix-sei-usage-on-old-fw-levels.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 06cd7a874ec6e09d151aeb1fa8600e14f1ff89f6 Mon Sep 17 00:00:00 2001
From: Sebastian Ott <[email protected]>
Date: Tue, 15 Apr 2014 20:08:01 +0200
Subject: s390/chsc: fix SEI usage on old FW levels
From: Sebastian Ott <[email protected]>
commit 06cd7a874ec6e09d151aeb1fa8600e14f1ff89f6 upstream.
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).
Reported-and-tested-by: Stefan Haberland <[email protected]>
Reviewed-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/s390/cio/chsc.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -541,18 +541,27 @@ static void chsc_process_sei_nt0(struct
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_informati
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;
+ }
}
/*
Patches currently in stable-queue which might be from [email protected]
are
queue-3.14/s390-chsc-fix-sei-usage-on-old-fw-levels.patch
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