cgroup simplify space stripping

Simplify the space stripping code in cgroup file write.

[akpm@linux-foundation.org: s/BUG_ON/BUILD_BUG_ON/]
Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 54760d5..7d20741 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1326,6 +1326,7 @@ static ssize_t cgroup_common_file_write(struct cgroup *cgrp,
                goto out1;
        }
        buffer[nbytes] = 0;     /* nul-terminate */
+       strstrip(buffer);       /* strip -just- trailing whitespace */
 
        mutex_lock(&cgroup_mutex);
 
@@ -1346,21 +1347,9 @@ static ssize_t cgroup_common_file_write(struct cgroup *cgrp,
                        clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
                break;
        case FILE_RELEASE_AGENT:
-       {
-               struct cgroupfs_root *root = cgrp->root;
-               /* Strip trailing newline */
-               if (nbytes && (buffer[nbytes-1] == '\n'))
-                       buffer[nbytes-1] = 0;
-
-               /* We never write anything other than '\0'
-                * into the last char of release_agent_path,
-                * so it always remains a NUL-terminated
-                * string */
-               strncpy(root->release_agent_path, buffer, nbytes);
-               root->release_agent_path[nbytes] = 0;
-
+               BUILD_BUG_ON(sizeof(cgrp->root->release_agent_path) < PATH_MAX);
+               strcpy(cgrp->root->release_agent_path, buffer);
                break;
-       }
        default:
                retval = -EINVAL;
                goto out2;