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PM / hibernate: use name_to_dev_t to parse resume

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Use the name_to_dev_t call to parse the device name echo'd to
to /sys/power/resume.  This imitates the method used in hibernate.c
in software_resume, and allows the resume partition to be specified
using other equivalent device formats as well.  By allowing
/sys/debug/resume to accept the same syntax as the resume=device
parameter, we can parse the resume=device in the init script and
use the resume device directly from the kernel command line.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sebastian Capella 2014-02-14 14:52:56 -08:00 • committed by Rafael J. Wysocki
parent 6c5be29165
commit 421a5fa1a6
1 changed files with 12 additions and 10 deletions
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22
kernel/power/hibernate.c
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@ -973,16 +973,20 @@ static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n) const char *buf, size_t n)
{ {
unsigned int maj, min;
dev_t res; dev_t res;
int ret = -EINVAL; int len = n;
char *name;
if (sscanf(buf, "%u:%u", &maj, &min) != 2) if (len && buf[len-1] == '\n')
goto out; len--;
name = kstrndup(buf, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
res = MKDEV(maj,min); res = name_to_dev_t(name);
if (maj != MAJOR(res) || min != MINOR(res)) kfree(name);
goto out; if (!res)
return -EINVAL;
lock_system_sleep(); lock_system_sleep();
swsusp_resume_device = res; swsusp_resume_device = res;
@ -990,9 +994,7 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
printk(KERN_INFO "PM: Starting manual resume from disk\n"); printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0; noresume = 0;
software_resume(); software_resume();
ret = n; return n;
out:
return ret;
} }
power_attr(resume); power_attr(resume);