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[S390] cio: force console function

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If something goes wrong in a suspend / resume cycle a ccw based console
if very likely in the suspended state and cannot print anything.
Introduce ccw_device_force_console to force the wake up of the console
device to be able to print the oops message. The console device drivers
should use this function only if the system paniced.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2009-06-16 10:30:28 +02:00
parent 14532095df
commit 6664845cef
2 changed files with 10 additions and 0 deletions
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1
arch/s390/include/asm/ccwdev.h
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@ -192,6 +192,7 @@ extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver) #define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
extern struct ccw_device *ccw_device_probe_console(void); extern struct ccw_device *ccw_device_probe_console(void);
extern int ccw_device_force_console(void);
// FIXME: these have to go // FIXME: these have to go
extern int _ccw_device_get_subchannel_number(struct ccw_device *); extern int _ccw_device_get_subchannel_number(struct ccw_device *);

9
drivers/s390/cio/device.c
View File

@ -1789,6 +1789,15 @@ ccw_device_probe_console(void)
return &console_cdev; return &console_cdev;
} }
static int ccw_device_pm_restore(struct device *dev);
int ccw_device_force_console(void)
{
if (!console_cdev_in_use)
return -ENODEV;
return ccw_device_pm_restore(&console_cdev.dev);
}
EXPORT_SYMBOL_GPL(ccw_device_force_console);
const char *cio_get_console_cdev_name(struct subchannel *sch) const char *cio_get_console_cdev_name(struct subchannel *sch)
{ {