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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-05-02 20:25:32 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-05-02 20:25:32 +0400 |
| commit | b28e4f08d43beca4ac8ba2f768f4aaa8b056c4cf (patch) | |
| tree | a80ab6bd7587948a028cc9c689339c4bfb57b7f2 /drivers | |
| parent | b7270cce7db770602510043b212992d839fd25a6 (diff) | |
| parent | 6e0de817594c61f3b392a9245deeb09609ec707d (diff) | |
| download | linux-b28e4f08d43beca4ac8ba2f768f4aaa8b056c4cf.tar.xz | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Martin Schwidefsky:
"Two bug fixes, one to fix a potential information leak in the BPF jit
and common-io-layer fix for old firmware levels"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH
s390/chsc: fix SEI usage on old FW levels
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/cio/chsc.c | 22 |
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; + } } /* |