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PM: hibernate: Freeze kernel threads in software_resume()
commit 2351f8d295
upstream.
Currently the kernel threads are not frozen in software_resume(), so
between dpm_suspend_start(PMSG_QUIESCE) and resume_target_kernel(),
system_freezable_power_efficient_wq can still try to submit SCSI
commands and this can cause a panic since the low level SCSI driver
(e.g. hv_storvsc) has quiesced the SCSI adapter and can not accept
any SCSI commands: https://lkml.org/lkml/2020/4/10/47
At first I posted a fix (https://lkml.org/lkml/2020/4/21/1318) trying
to resolve the issue from hv_storvsc, but with the help of
Bart Van Assche, I realized it's better to fix software_resume(),
since this looks like a generic issue, not only pertaining to SCSI.
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 7 additions and 0 deletions
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@ -898,6 +898,13 @@ static int software_resume(void)
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error = freeze_processes();
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if (error)
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goto Close_Finish;
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error = freeze_kernel_threads();
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if (error) {
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thaw_processes();
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goto Close_Finish;
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}
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error = load_image_and_restore();
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thaw_processes();
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Finish:
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