[PATCH v4 2/2] PM / Hibernate: use name_to_dev_t to parse resume
From: Sebastian Capella <hidden>
Date: 2014-01-29 23:49:00
Also in:
linux-pm, lkml
Subsystem:
hibernation (aka software suspend, aka swsusp), suspend to ram, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
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 <redacted> Cc: Pavel Machek <redacted> Cc: Len Brown <redacted> Cc: "Rafael J. Wysocki" <redacted> --- kernel/power/hibernate.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 37170d4..b4a3e0b 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c@@ -973,26 +973,27 @@ 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; + char *name = kstrimdup(buf, GFP_KERNEL); - if (sscanf(buf, "%u:%u", &maj, &min) != 2) - goto out; + if (name == NULL) + return -ENOMEM; - res = MKDEV(maj,min); - if (maj != MAJOR(res) || min != MINOR(res)) - goto out; + res = name_to_dev_t(name); - lock_system_sleep(); - swsusp_resume_device = res; - unlock_system_sleep(); - printk(KERN_INFO "PM: Starting manual resume from disk\n"); - noresume = 0; - software_resume(); - ret = n; - out: - return ret; + if (res != 0) { + lock_system_sleep(); + swsusp_resume_device = res; + unlock_system_sleep(); + printk(KERN_INFO "PM: Starting manual resume from disk\n"); + noresume = 0; + software_resume(); + } else { + n = -EINVAL; + } + + kfree(name); + return n; } power_attr(resume);
--
1.7.9.5
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