From 421a5fa1a6cfc037a21220b638d4def6da7cbabe Mon Sep 17 00:00:00 2001 From: Sebastian Capella Date: Fri, 14 Feb 2014 14:52:56 -0800 Subject: PM / hibernate: use name_to_dev_t to parse resume 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 Acked-by: Pavel Machek Signed-off-by: Rafael J. Wysocki --- kernel/power/hibernate.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) (limited to 'kernel/power') diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 37170d4dd9a6..f4f2073711d3 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -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, const char *buf, size_t n) { - unsigned int maj, min; dev_t res; - int ret = -EINVAL; + int len = n; + char *name; - if (sscanf(buf, "%u:%u", &maj, &min) != 2) - goto out; + if (len && buf[len-1] == '\n') + len--; + name = kstrndup(buf, len, GFP_KERNEL); + if (!name) + return -ENOMEM; - res = MKDEV(maj,min); - if (maj != MAJOR(res) || min != MINOR(res)) - goto out; + res = name_to_dev_t(name); + kfree(name); + if (!res) + return -EINVAL; lock_system_sleep(); 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"); noresume = 0; software_resume(); - ret = n; - out: - return ret; + return n; } power_attr(resume); -- cgit v1.2.3