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Merge "ALSA: timer: Fix race among timer ioctls" into LA.BF.1.1.3_rb1.15

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2017-01-27 04:30:48 -08:00
committed by Gerrit - the friendly Code Review server
parent 276c6aa41b a9366e0bed
commit 4945378a30
1 changed files with 19 additions and 13 deletions
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sound/core/timer.c
+19 -13
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@@ -73,7 +73,7 @@ struct snd_timer_user {
struct timespec tstamp; /* trigger tstamp */
wait_queue_head_t qchange_sleep;
struct fasync_struct *fasync;
struct mutex tread_sem;
struct mutex ioctl_lock;
};
/* list of timers */
@@ -1266,7 +1266,7 @@ static int snd_timer_user_open(struct inode *inode, struct file *file)
return -ENOMEM;
spin_lock_init(&tu->qlock);
init_waitqueue_head(&tu->qchange_sleep);
mutex_init(&tu->tread_sem);
mutex_init(&tu->ioctl_lock);
tu->ticks = 1;
tu->queue_size = 128;
tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
@@ -1286,8 +1286,10 @@ static int snd_timer_user_release(struct inode *inode, struct file *file)
if (file->private_data) {
tu = file->private_data;
file->private_data = NULL;
mutex_lock(&tu->ioctl_lock);
if (tu->timeri)
snd_timer_close(tu->timeri);
mutex_unlock(&tu->ioctl_lock);
kfree(tu->queue);
kfree(tu->tqueue);
kfree(tu);
@@ -1525,7 +1527,6 @@ static int snd_timer_user_tselect(struct file *file,
int err = 0;
tu = file->private_data;
mutex_lock(&tu->tread_sem);
if (tu->timeri) {
snd_timer_close(tu->timeri);
tu->timeri = NULL;
@@ -1569,7 +1570,6 @@ static int snd_timer_user_tselect(struct file *file,
}
__err:
mutex_unlock(&tu->tread_sem);
return err;
}
@@ -1782,7 +1782,7 @@ enum {
SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
};
static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu;
@@ -1799,17 +1799,11 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
{
int xarg;
mutex_lock(&tu->tread_sem);
if (tu->timeri) { /* too late */
mutex_unlock(&tu->tread_sem);
if (tu->timeri) /* too late */
return -EBUSY;
}
if (get_user(xarg, p)) {
mutex_unlock(&tu->tread_sem);
if (get_user(xarg, p))
return -EFAULT;
}
tu->tread = xarg ? 1 : 0;
mutex_unlock(&tu->tread_sem);
return 0;
}
case SNDRV_TIMER_IOCTL_GINFO:
@@ -1842,6 +1836,18 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
return -ENOTTY;
}
static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu = file->private_data;
long ret;
mutex_lock(&tu->ioctl_lock);
ret = __snd_timer_user_ioctl(file, cmd, arg);
mutex_unlock(&tu->ioctl_lock);
return ret;
}
static int snd_timer_user_fasync(int fd, struct file * file, int on)
{
struct snd_timer_user *tu;