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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2009-12-07 14:51:17 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-12-07 14:51:29 +0300 |
| commit | 5d6e6b6f6f3eac10a7f5a15e961bac3b36824d9d (patch) | |
| tree | b64af704c59b0820c0537bd0bed45caa0d5e26b7 /drivers/s390/cio/css.c | |
| parent | 60e4dac1abdf49ccdb7545ec406325f08423d848 (diff) | |
| download | linux-5d6e6b6f6f3eac10a7f5a15e961bac3b36824d9d.tar.xz | |
[S390] cio: introduce parent-initiated device move
Change the initiative to update subchannel-ccw device associations
to the subchannel: when there is an indication that the internal
association no longer reflects the current hardware state, mark
each affected subchannel as requiring attention. Once processing
reaches a subchannel, determine the correct association for that
subchannel at that time and perform the necessary device_move
operations.
This change fixes problems with the previous approach which would
leave devices in an inconsistent state when a new hardware change
occurred while a device_move was already scheduled.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/css.c')
| -rw-r--r-- | drivers/s390/cio/css.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 91c25706fa83..b4df5a56cfe2 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -376,8 +376,8 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) /* Unusable - ignore. */ return 0; } - CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, " - "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER); + CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid, + schid.sch_no); return css_probe_device(schid); } @@ -394,6 +394,10 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) "Got subchannel machine check but " "no sch_event handler provided.\n"); } + if (ret != 0 && ret != -EAGAIN) { + CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", + sch->schid.ssid, sch->schid.sch_no, ret); + } return ret; } @@ -684,6 +688,7 @@ static int __init setup_css(int nr) css->pseudo_subchannel->dev.parent = &css->device; css->pseudo_subchannel->dev.release = css_subchannel_release; dev_set_name(&css->pseudo_subchannel->dev, "defunct"); + mutex_init(&css->pseudo_subchannel->reg_mutex); ret = cio_create_sch_lock(css->pseudo_subchannel); if (ret) { kfree(css->pseudo_subchannel); |