Resume fails if kernel swsusp method is not configured

Bug in script:

    debian/initramfs-tools/scripts/local-premount/uswsusp

(This script has stayed the same at least from lucid to precise.
I guess this will need to go upstream?)

Problem:

The uswsusp initramfs boot script (scripts/local-premount/uswsusp)
exits if the kernel swsusp's "resume=<dev>" is not set (i.e. it is set
neither in initramfs conf.d/resume nor as a grub boot parameter)
resulting in a failed resume from hibernation.

This should not happen since /sbin/resume has its own config file and
the script does not pass the "resume=<dev>" parameter to /sbin/resume
anyway, so /sbin/resume should be run independently of the
"resume=" parameter (unless the noresume boot parameter is present).

Fix:

The line

    [ -n ${resume}" ] || exit 0;

should have been

    [ -z "${noresume}" ] || exit 0;

Patch attached.

Comment: An alternative fix would be to modify the above boot script
to pass the "resume=<dev>" parameter as /sbin/resume -r ${resume},
which would let users specify the resume device in a more unified
way between kernel swsusp and userland uswsusp methods. But
it would also create more complications (/sbin/resume's config file
may not get used for resume anymore) and it will disturb the current
independence of the kernel and userland methods as well.
.