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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2010-03-05 13:42:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:26 -0800 |
| commit | 452aa6999e6703ffbddd7f6ea124d3968915f3e3 (patch) | |
| tree | 48e375fdb60920675f68b444b462903ad8bb6940 /kernel/power/suspend.c | |
| parent | ad2bd7e0e9647cd48593a6b3a2be07dc2c2d28ed (diff) | |
| download | blackbird-op-linux-452aa6999e6703ffbddd7f6ea124d3968915f3e3.tar.gz blackbird-op-linux-452aa6999e6703ffbddd7f6ea124d3968915f3e3.zip | |
mm/pm: force GFP_NOIO during suspend/hibernation and resume
There are quite a few GFP_KERNEL memory allocations made during
suspend/hibernation and resume that may cause the system to hang, because
the I/O operations they depend on cannot be completed due to the
underlying devices being suspended.
Avoid this problem by clearing the __GFP_IO and __GFP_FS bits in
gfp_allowed_mask before suspend/hibernation and restoring the original
values of these bits in gfp_allowed_mask durig the subsequent resume.
[akpm@linux-foundation.org: fix CONFIG_PM=n linkage]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Sebastian Ott <sebott@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/suspend.c')
| -rw-r--r-- | kernel/power/suspend.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 6f10dfc2d3e9..44cce10b582d 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -189,6 +189,7 @@ static int suspend_enter(suspend_state_t state) int suspend_devices_and_enter(suspend_state_t state) { int error; + gfp_t saved_mask; if (!suspend_ops) return -ENOSYS; @@ -199,6 +200,7 @@ int suspend_devices_and_enter(suspend_state_t state) goto Close; } suspend_console(); + saved_mask = clear_gfp_allowed_mask(GFP_IOFS); suspend_test_start(); error = dpm_suspend_start(PMSG_SUSPEND); if (error) { @@ -215,6 +217,7 @@ int suspend_devices_and_enter(suspend_state_t state) suspend_test_start(); dpm_resume_end(PMSG_RESUME); suspend_test_finish("resume devices"); + set_gfp_allowed_mask(saved_mask); resume_console(); Close: if (suspend_ops->end) |
