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authorAlexey Dobriyan <adobriyan@gmail.com>2012-05-31 16:26:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:29 -0700
commitf05ed3f1abefd37c08fbf08c766d2abd40607777 (patch)
treef938f73f6f3ee4bab88ada21212371cd023eca63 /fs/proc
parent2344bec788b097b2d1198758bd29c583812b864e (diff)
downloadop-kernel-dev-f05ed3f1abefd37c08fbf08c766d2abd40607777.zip
op-kernel-dev-f05ed3f1abefd37c08fbf08c766d2abd40607777.tar.gz
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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 155dee6..0f928cb 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -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:
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