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author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-02-09 22:54:09 (GMT) |
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committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-02-09 22:54:09 (GMT) |
commit | 3ed3c7b559f3cae7a5a92860a127ceb0cafd5a9c (patch) | |
tree | c8ab8e608222f07edf46a42e6ec3cb27ac4ceaa0 /kernel | |
parent | e470d06655e00749f6f9372e4fa4f20cea7ed7c5 (diff) | |
parent | d020283dc694c9ec31b410f522252f7a8397e67d (diff) | |
download | linux-fsl-qoriq-3ed3c7b559f3cae7a5a92860a127ceb0cafd5a9c.tar.xz |
Merge commit 'pm-fixes-for-3.3-rc3' into pm-sleep
New material in the pm-sleep branch depends on recent
power management fixes.
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/power/power.h | 24 | ||||
-rw-r--r-- | kernel/power/process.c | 7 | ||||
-rw-r--r-- | kernel/power/user.c | 6 |
3 files changed, 31 insertions, 6 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index 0c4defe..21724ee 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -231,8 +231,28 @@ extern int pm_test_level; #ifdef CONFIG_SUSPEND_FREEZER static inline int suspend_freeze_processes(void) { - int error = freeze_processes(); - return error ? : freeze_kernel_threads(); + int error; + + error = freeze_processes(); + + /* + * freeze_processes() automatically thaws every task if freezing + * fails. So we need not do anything extra upon error. + */ + if (error) + goto Finish; + + error = freeze_kernel_threads(); + + /* + * freeze_kernel_threads() thaws only kernel threads upon freezing + * failure. So we have to thaw the userspace tasks ourselves. + */ + if (error) + thaw_processes(); + + Finish: + return error; } static inline void suspend_thaw_processes(void) diff --git a/kernel/power/process.c b/kernel/power/process.c index eeca003..7e42645 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -143,7 +143,10 @@ int freeze_processes(void) /** * freeze_kernel_threads - Make freezable kernel threads go to the refrigerator. * - * On success, returns 0. On failure, -errno and system is fully thawed. + * On success, returns 0. On failure, -errno and only the kernel threads are + * thawed, so as to give a chance to the caller to do additional cleanups + * (if any) before thawing the userspace tasks. So, it is the responsibility + * of the caller to thaw the userspace tasks, when the time is right. */ int freeze_kernel_threads(void) { @@ -159,7 +162,7 @@ int freeze_kernel_threads(void) BUG_ON(in_atomic()); if (error) - thaw_processes(); + thaw_kernel_threads(); return error; } diff --git a/kernel/power/user.c b/kernel/power/user.c index e5a21a8..3e10007 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -249,13 +249,15 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, } pm_restore_gfp_mask(); error = hibernation_snapshot(data->platform_support); - if (!error) { + if (error) { + thaw_kernel_threads(); + } else { error = put_user(in_suspend, (int __user *)arg); if (!error && !freezer_test_done) data->ready = 1; if (freezer_test_done) { freezer_test_done = false; - thaw_processes(); + thaw_kernel_threads(); } } break; |