diff options
Diffstat (limited to 'kernel/power/user.c')
| -rw-r--r-- | kernel/power/user.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index ad241b4ff64c..3a4e70366f35 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -26,6 +26,7 @@ #include "power.h" +static bool need_wait; static struct snapshot_data { struct snapshot_handle handle; @@ -46,12 +47,13 @@ int is_hibernate_resume_dev(dev_t dev) static int snapshot_open(struct inode *inode, struct file *filp) { struct snapshot_data *data; + unsigned int sleep_flags; int error; if (!hibernation_available()) return -EPERM; - lock_system_sleep(); + sleep_flags = lock_system_sleep(); if (!hibernate_acquire()) { error = -EBUSY; @@ -78,7 +80,7 @@ static int snapshot_open(struct inode *inode, struct file *filp) * Resuming. We may need to wait for the image device to * appear. */ - wait_for_device_probe(); + need_wait = true; data->swap = -1; data->mode = O_WRONLY; @@ -97,7 +99,7 @@ static int snapshot_open(struct inode *inode, struct file *filp) data->dev = 0; Unlock: - unlock_system_sleep(); + unlock_system_sleep(sleep_flags); return error; } @@ -105,8 +107,9 @@ static int snapshot_open(struct inode *inode, struct file *filp) static int snapshot_release(struct inode *inode, struct file *filp) { struct snapshot_data *data; + unsigned int sleep_flags; - lock_system_sleep(); + sleep_flags = lock_system_sleep(); swsusp_free(); data = filp->private_data; @@ -123,7 +126,7 @@ static int snapshot_release(struct inode *inode, struct file *filp) PM_POST_HIBERNATION : PM_POST_RESTORE); hibernate_release(); - unlock_system_sleep(); + unlock_system_sleep(sleep_flags); return 0; } @@ -131,11 +134,12 @@ static int snapshot_release(struct inode *inode, struct file *filp) static ssize_t snapshot_read(struct file *filp, char __user *buf, size_t count, loff_t *offp) { + loff_t pg_offp = *offp & ~PAGE_MASK; struct snapshot_data *data; + unsigned int sleep_flags; ssize_t res; - loff_t pg_offp = *offp & ~PAGE_MASK; - lock_system_sleep(); + sleep_flags = lock_system_sleep(); data = filp->private_data; if (!data->ready) { @@ -156,7 +160,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf, *offp += res; Unlock: - unlock_system_sleep(); + unlock_system_sleep(sleep_flags); return res; } @@ -164,11 +168,17 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf, static ssize_t snapshot_write(struct file *filp, const char __user *buf, size_t count, loff_t *offp) { + loff_t pg_offp = *offp & ~PAGE_MASK; struct snapshot_data *data; + unsigned long sleep_flags; ssize_t res; - loff_t pg_offp = *offp & ~PAGE_MASK; - lock_system_sleep(); + if (need_wait) { + wait_for_device_probe(); + need_wait = false; + } + + sleep_flags = lock_system_sleep(); data = filp->private_data; @@ -190,7 +200,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf, if (res > 0) *offp += res; unlock: - unlock_system_sleep(); + unlock_system_sleep(sleep_flags); return res; } @@ -244,6 +254,11 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, loff_t size; sector_t offset; + if (need_wait) { + wait_for_device_probe(); + need_wait = false; + } + if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC) return -ENOTTY; if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR) |