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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2006-07-12 18:39:50 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-07-12 18:39:50 +0400 |
| commit | 6ab4879a0d074c938fd17dba141dce042fc17bee (patch) | |
| tree | 62e413692d4c55ae322c3201c36ded4808806cb5 /drivers/s390/cio/cio.h | |
| parent | 63f4f9e1281ea9b9a2304bd13d657ba9d401c9a7 (diff) | |
| download | linux-6ab4879a0d074c938fd17dba141dce042fc17bee.tar.xz | |
[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.h')
| -rw-r--r-- | drivers/s390/cio/cio.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h index 0ca987344e07..4541c1af4b66 100644 --- a/drivers/s390/cio/cio.h +++ b/drivers/s390/cio/cio.h @@ -2,6 +2,7 @@ #define S390_CIO_H #include "schid.h" +#include <linux/mutex.h> /* * where we put the ssd info @@ -87,7 +88,7 @@ struct orb { struct subchannel { struct subchannel_id schid; spinlock_t lock; /* subchannel lock */ - + struct mutex reg_mutex; enum { SUBCHANNEL_TYPE_IO = 0, SUBCHANNEL_TYPE_CHSC = 1, |