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| author |   Cornelia Huck <cornelia.huck@de.ibm.com> | 2006-07-12 16:39:50 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-07-12 16:39:50 +0200 |
| commit | 6ab4879a0d074c938fd17dba141dce042fc17bee (patch) | |
| tree | 62e413692d4c55ae322c3201c36ded4808806cb5 /drivers/s390/cio/cio.c | |
| parent | [S390] raw_local_save_flags/raw_local_irq_restore type check (diff) | |
| download | linux-dev-6ab4879a0d074c938fd17dba141dce042fc17bee.tar.xz linux-dev-6ab4879a0d074c938fd17dba141dce042fc17bee.zip | |
[S390] subchannel register/unregister mutex.
Add a reg_mutex to prevent unregistering a subchannel before it has been
registered. Since 2.6.17, we've seen oopses in kslowcrw when a device is
found to be not operational during sense id when doing initial device
recognition; it is not clear yet why that particular problem was not (yet)
observed with earlier kernels...
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 6fec90eab00e..f27b2b866f5a 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -519,6 +519,7 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid) memset(sch, 0, sizeof(struct subchannel)); spin_lock_init(&sch->lock); + mutex_init(&sch->reg_mutex); /* Set a name for the subchannel */ snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid, |