[PATCH] proc: smaller readlock section in readdir("/proc")

[Alexey Dobriyan]

Readdir context is thread local, so ->pos is thread local,
move it out of readlock.

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 fs/proc/generic.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -286,9 +286,9 @@ int proc_readdir_de(struct file *file, struct dir_context 
*ctx,
        if (!dir_emit_dots(file, ctx))
                return 0;
 
+       i = ctx->pos - 2;
        read_lock(&proc_subdir_lock);
        de = pde_subdir_first(de);
-       i = ctx->pos - 2;
        for (;;) {
                if (!de) {
                        read_unlock(&proc_subdir_lock);
@@ -309,8 +309,8 @@ int proc_readdir_de(struct file *file, struct dir_context 
*ctx,
                        pde_put(de);
                        return 0;
                }
-               read_lock(&proc_subdir_lock);
                ctx->pos++;
+               read_lock(&proc_subdir_lock);
                next = pde_subdir_next(de);
                pde_put(de);
                de = next;