switch timerfd_[sg]ettime(2) to fget_light()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/timerfd.c b/fs/timerfd.c
index dffeb3795af1d4204f8554447dbb2d2c33992429..dd91e9420c9e09fa1de66892aa605eaa66d8f370 100644 (file)
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -234,15 +234,15 @@ static const struct file_operations timerfd_fops = {
        .llseek         = noop_llseek,
 };
 
-static struct file *timerfd_fget(int fd)
+static struct file *timerfd_fget(int fd, int *fput_needed)
 {
        struct file *file;
 
-       file = fget(fd);
+       file = fget_light(fd, fput_needed);
        if (!file)
                return ERR_PTR(-EBADF);
        if (file->f_op != &timerfd_fops) {
-               fput(file);
+               fput_light(file, *fput_needed);
                return ERR_PTR(-EINVAL);
        }
 
@@ -287,7 +287,7 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
        struct file *file;
        struct timerfd_ctx *ctx;
        struct itimerspec ktmr, kotmr;
-       int ret;
+       int ret, fput_needed;
 
        if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
                return -EFAULT;
@@ -297,7 +297,7 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
            !timespec_valid(&ktmr.it_interval))
                return -EINVAL;
 
-       file = timerfd_fget(ufd);
+       file = timerfd_fget(ufd, &fput_needed);
        if (IS_ERR(file))
                return PTR_ERR(file);
        ctx = file->private_data;
@@ -334,7 +334,7 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
        ret = timerfd_setup(ctx, flags, &ktmr);
 
        spin_unlock_irq(&ctx->wqh.lock);
-       fput(file);
+       fput_light(file, fput_needed);
        if (otmr && copy_to_user(otmr, &kotmr, sizeof(kotmr)))
                return -EFAULT;
 
@@ -346,8 +346,9 @@ SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
        struct file *file;
        struct timerfd_ctx *ctx;
        struct itimerspec kotmr;
+       int fput_needed;
 
-       file = timerfd_fget(ufd);
+       file = timerfd_fget(ufd, &fput_needed);
        if (IS_ERR(file))
                return PTR_ERR(file);
        ctx = file->private_data;
@@ -362,7 +363,7 @@ SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
        kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
        kotmr.it_interval = ktime_to_timespec(ctx->tintv);
        spin_unlock_irq(&ctx->wqh.lock);
-       fput(file);
+       fput_light(file, fput_needed);
 
        return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0;
 }