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| author | Cornelia Huck | 2006-12-08 15:54:28 +0100 |
|---|---|---|
| committer | Martin Schwidefsky | 2006-12-08 15:54:28 +0100 |
| commit | d7b5a4c94f49131811112526f7d404a50f0b5ca7 (patch) | |
| tree | 159cb6717e16339b821315c0bc6b17b6f5df5119 /drivers/s390/cio/cio.c | |
| parent | [S390] subchannel lock conversion. (diff) | |
| download | kernel-qcow2-linux-d7b5a4c94f49131811112526f7d404a50f0b5ca7.tar.gz kernel-qcow2-linux-d7b5a4c94f49131811112526f7d404a50f0b5ca7.tar.xz kernel-qcow2-linux-d7b5a4c94f49131811112526f7d404a50f0b5ca7.zip | |
[S390] Support for disconnected devices reappearing on another subchannel.
- create a 'pseudo_subchannel' per channel subsystem (the 'orphanage')
- use the orphanage as a shelter for ccw_devices that can't remain on the same
subchannel
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/cio.c')
| -rw-r--r-- | drivers/s390/cio/cio.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index e8d331493fd8..7835a714a405 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -415,6 +415,8 @@ cio_enable_subchannel (struct subchannel *sch, unsigned int isc) CIO_TRACE_EVENT (2, "ensch"); CIO_TRACE_EVENT (2, sch->dev.bus_id); + if (sch_is_pseudo_sch(sch)) + return -EINVAL; ccode = stsch (sch->schid, &sch->schib); if (ccode) return -ENODEV; @@ -462,6 +464,8 @@ cio_disable_subchannel (struct subchannel *sch) CIO_TRACE_EVENT (2, "dissch"); CIO_TRACE_EVENT (2, sch->dev.bus_id); + if (sch_is_pseudo_sch(sch)) + return 0; ccode = stsch (sch->schid, &sch->schib); if (ccode == 3) /* Not operational. */ return -ENODEV; @@ -496,7 +500,7 @@ cio_disable_subchannel (struct subchannel *sch) return ret; } -static int cio_create_sch_lock(struct subchannel *sch) +int cio_create_sch_lock(struct subchannel *sch) { sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); if (!sch->lock) |