xiaomi-sm8450/android_kernel_xiaomi_sm8450
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[S390] subchannel register/unregister mutex.

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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>
This commit is contained in:
Cornelia Huck
2006-07-12 16:39:50 +02:00
committed by Martin Schwidefsky
parent 63f4f9e128
commit 6ab4879a0d
5 changed files with 29 additions and 7 deletions
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drivers/s390/cio/css.h
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@@ -136,6 +136,8 @@ extern struct bus_type css_bus_type;
extern struct css_driver io_subchannel_driver;
extern int css_probe_device(struct subchannel_id);
extern int css_sch_device_register(struct subchannel *);
extern void css_sch_device_unregister(struct subchannel *);
extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);