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proc: don't do dummy rcu_read_lock/rcu_read_unlock on error path 

rcu_read_lock()/rcu_read_unlock() is nop for TINY_RCU, but is not a nop
for, say, PREEMPT_RCU.

proc_fill_cache() is called without RCU lock, there is no need to
lock/unlock on error path, simply jump out of the loop.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2012-05-31 16:26:18 -07:00 committed by Linus Torvalds
parent 2344bec788
commit f05ed3f1ab
1 changed files with 7 additions and 6 deletions
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13
fs/proc/base.c
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@ -1928,21 +1928,22 @@ static int proc_readfd_common(struct file * filp, void * dirent,
fd++, filp->f_pos++) {
char name[PROC_NUMBUF];
int len;
int rv;
if (!fcheck_files(files, fd))
continue;
rcu_read_unlock();
len = snprintf(name, sizeof(name), "%d", fd);
if (proc_fill_cache(filp, dirent, filldir,
name, len, instantiate,
p, &fd) < 0) {
rcu_read_lock();
break;
}
rv = proc_fill_cache(filp, dirent, filldir,
name, len, instantiate, p,
&fd);
if (rv < 0)
goto out_fd_loop;
rcu_read_lock();
}
rcu_read_unlock();
out_fd_loop:
put_files_struct(files);
}
out: