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PM: Fix potential issue with failing asynchronous suspend

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There is a potential issue with the asynchronous suspend code that
a device driver suspending asynchronously may not notice that it
should back off.  There are two failing scenarions, (1) when the
driver is waiting for a driver suspending synchronously to complete
and that second driver returns error code, in which case async_error
won't be set and the waiting driver will continue suspending and (2)
after the driver has called device_pm_wait_for_dev() and the waited
for driver returns error code, in which case the caller of
device_pm_wait_for_dev() will not know that there was an error and
will continue suspending.

To fix this issue make __device_suspend() set async_error, so
async_suspend() doesn't need to set it any more, and make
device_pm_wait_for_dev() return async_error, so that its callers
can check whether or not they should continue suspending.

No more changes are necessary, since device_pm_wait_for_dev() is
not used by any drivers' suspend routines.

Reported-by: Colin Cross <ccross@android.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki
2010-09-22 22:10:57 +02:00
parent 074037ec79
commit 098dff738a
2 changed files with 14 additions and 8 deletions
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7
include/linux/pm.h
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@@ -559,7 +559,7 @@ extern void __suspend_report_result(const char *function, void *fn, int ret);
__suspend_report_result(__func__, fn, ret); \
} while (0)
extern void device_pm_wait_for_dev(struct device *sub, struct device *dev);
extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
#else /* !CONFIG_PM_SLEEP */
#define device_pm_lock() do {} while (0)
@@ -572,7 +572,10 @@ static inline int dpm_suspend_start(pm_message_t state)
#define suspend_report_result(fn, ret) do {} while (0)
static inline void device_pm_wait_for_dev(struct device *a, struct device *b) {}
static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
{
return 0;
}
#endif /* !CONFIG_PM_SLEEP */
/* How to reorder dpm_list after device_move() */