diff options
| author | Andy Green <andy@openmoko.com> | 2008-11-19 17:09:52 +0000 |
|---|---|---|
| committer | Andy Green <agreen@pads.home.warmcat.com> | 2008-11-19 17:09:52 +0000 |
| commit | 6d3fb8064a9336438137d7987bb1e58433528d59 (patch) | |
| tree | 122c31d6b17d6aec7881bd03cdaec59958b29da1 /kernel/power | |
| parent | 7e7270be85be64eeee2196bbc8cd877395870f40 (diff) | |
introduce-resume-exception-capture.patch
This patch introduces a new resume debugging concept: if we
get an OOPS inbetween starting suspend and finishing resume, it
uses a new "emergency spew" device similar to BUT NOT REQUIRING
CONFIG_DEBUG_LL to dump the syslog buffer and then the OOPS
on the debug device defined by the existing CONFIG_DEBUG_S3C_UART
index. But neither CONFIG_DEBUG_LL nor the S3C low level configs
are needed to use this feature.
Another difference between this feature and CONFIG_DEBUG_LL is that
it does not affect resume timing, ordering or UART traffic UNLESS
there is an OOPS during resume.
The patch adds three global exports, one to say if we are inside
suspend / resume, and two callbacks for printk() to use to init
and dump the emergency data. The callbacks are set in s3c serial
device init, but the whole structure is arch independent.
Signed-off-by: Andy Green <andy@openmoko.com>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index 19122cf6d82..3fdc1f42376 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -132,6 +132,9 @@ static inline int suspend_test(int level) { return 0; } #endif /* CONFIG_PM_SLEEP */ +int global_inside_suspend; +EXPORT_SYMBOL(global_inside_suspend); + #ifdef CONFIG_SUSPEND #ifdef CONFIG_PM_TEST_SUSPEND @@ -322,6 +325,8 @@ int suspend_devices_and_enter(suspend_state_t state) if (!suspend_ops) return -ENOSYS; + global_inside_suspend = 1; + if (suspend_ops->begin) { error = suspend_ops->begin(state); if (error) @@ -365,6 +370,8 @@ int suspend_devices_and_enter(suspend_state_t state) Close: if (suspend_ops->end) suspend_ops->end(); + global_inside_suspend = 0; + return error; Recover_platform: |