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locking: memory locking ONLY with suspending reason

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It's important to lock memory beforo running SUSPEND ioctl - but whole
lvm preload runs in memory unlocked environment - as in this phase
memory allocation is allowed and is meant to happen.

Once all targets are preload and ready (confirmed from all targets)
we start suspending tree - and here the memory allocation (or i.e.
opening files) is no longer allowed - as it may cause kernel deadlock.
This commit is contained in:
Zdenek Kabelac 2018-06-30 10:35:08 +02:00
parent b55d30956d
commit 0bae9a1bff
1 changed files with 1 additions and 2 deletions
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3
lib/mm/memlock.c
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@ -604,8 +604,7 @@ static void _unlock_mem_if_possible(struct cmd_context *cmd)
void critical_section_inc(struct cmd_context *cmd, const char *reason)
{
if (!_critical_section &&
((strcmp(reason, "suspending") == 0) ||
(strcmp(reason, "locking for suspend") == 0))) {
(strcmp(reason, "suspending") == 0)) {
/*
* Profiles are loaded on-demand so make sure that before
* entering the critical section all needed profiles are