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lguest: move process freezing before pending signals check

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run_guest tries to freeze the current process after it has handled
pending interrupts and before it calls lguest_arch_run_guest.
This doesn't work nicely if the task has been killed while being frozen
and when we want to handle that signal as soon as possible.
Let's move try_to_freeze before we check for pending signal so that we
can get out of the loop as soon as possible.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michal Hocko 2011-09-27 08:56:03 +02:00 committed by Rusty Russell
parent 89cfc99177
commit 0acf00014b
1 changed files with 7 additions and 7 deletions
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14
drivers/lguest/core.c
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@ -232,6 +232,13 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
}
}
/*
* All long-lived kernel loops need to check with this horrible
* thing called the freezer. If the Host is trying to suspend,
* it stops us.
*/
try_to_freeze();
/* Check for signals */
if (signal_pending(current))
return -ERESTARTSYS;
@ -245,13 +252,6 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
if (irq < LGUEST_IRQS)
try_deliver_interrupt(cpu, irq, more);
/*
* All long-lived kernel loops need to check with this horrible
* thing called the freezer. If the Host is trying to suspend,
* it stops us.
*/
try_to_freeze();
/*
* Just make absolutely sure the Guest is still alive. One of
* those hypercalls could have been fatal, for example.