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freezer,umh: Clean up freezer/initrd interaction

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handle_initrd() marks itself as PF_FREEZER_SKIP in order to ensure
that the UMH, which is going to freeze the system, doesn't
indefinitely wait for it's caller.

Rework things by adding UMH_FREEZABLE to indicate the completion is
freezable.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220822114648.791019324@infradead.org
This commit is contained in:
Peter Zijlstra
2022-08-22 13:18:18 +02:00
parent 5950e5d574
commit 1fbcaa923c
3 changed files with 14 additions and 13 deletions
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8
kernel/umh.c
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@@ -28,6 +28,7 @@
#include <linux/async.h>
#include <linux/uaccess.h>
#include <linux/initrd.h>
#include <linux/freezer.h>
#include <trace/events/module.h>
@@ -436,6 +437,9 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
if (wait == UMH_NO_WAIT) /* task has freed sub_info */
goto unlock;
if (wait & UMH_FREEZABLE)
freezer_do_not_count();
if (wait & UMH_KILLABLE) {
retval = wait_for_completion_killable(&done);
if (!retval)
@@ -448,6 +452,10 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
}
wait_for_completion(&done);
if (wait & UMH_FREEZABLE)
freezer_count();
wait_done:
retval = sub_info->retval;
out: