> +++ linux/fs/fcntl.c
quoted text
> @@ -240,11 +240,15 @@ static int setfl(int fd, struct file * f
>  
>         lock_kernel();
>         if ((arg ^ filp->f_flags) & FASYNC) {
> -               if (filp->f_op && filp->f_op->fasync) {
> +               if (filp->f_op && filp->f_op->unlocked_fasync)
> +                       error = filp->f_op->unlocked_fasync(fd, filp,
> +                                       !!(arg & FASYNC));
> +               else if (filp->f_op && filp->f_op->fasync) {
>                         error = filp->f_op->fasync(fd, filp, (arg & FASYNC) !=
0);
quoted text
>                         if (error < 0)
>                                 goto out;

No goto if you use unlocked_fasync?

quoted text
>                 }
> +               /* AK: no else error = -EINVAL here? */
>         }
>  
>         filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
> --
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