Commit cb31ef48 authored by Chen Yu's avatar Chen Yu Committed by Mike Snitzer

init: fix regression by supporting devices with major:minor:offset format

Commit 283e7ad0 ("init: stricter checking of major:minor root=
values") was so strict that it exposed the fact that a previously
unknown device format was being used.

Distributions like Ubuntu uses klibc (rather than uswsusp) to resume
system from hibernation.  klibc expressed the swap partition/file in
the form of major:minor:offset.  For example, 8:3:0 represents a swap
partition in klibc, and klibc's resume process in initrd will finally
echo 8:3:0 to /sys/power/resume for manually resuming.  However, due
to commit 283e7ad0's stricter checking, 8:3:0 will be treated as an
invalid device format, and manual resuming from hibernation will fail.

Fix this by adding support for devices with major:minor:offset format
when resuming from hibernation.
Reported-by: default avatarPrigent, Christophe <christophe.prigent@intel.com>
Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Acked-by: default avatarRafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent c0403ec0
......@@ -225,10 +225,11 @@ dev_t name_to_dev_t(const char *name)
#endif
if (strncmp(name, "/dev/", 5) != 0) {
unsigned maj, min;
unsigned maj, min, offset;
char dummy;
if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) {
if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) ||
(sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) {
res = MKDEV(maj, min);
if (maj != MAJOR(res) || min != MINOR(res))
goto fail;
......
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