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authorAlexey Dobriyan <adobriyan@gmail.com>2008-10-27 22:48:36 +0300
committerAlexey Dobriyan <adobriyan@gmail.com>2009-01-05 12:27:44 +0300
commitb4df2b92d8461444fac429c75ba6e125c63056bc (patch)
tree15149c192776b817eeb6124978f74411490aa1ce /fs/proc/inode.c
parentfe0bdec68b77020281dc814805edfe594ae89e0f (diff)
downloadlinux-b4df2b92d8461444fac429c75ba6e125c63056bc.tar.xz
proc: stop using BKL
There are four BKL users in proc: de_put(), proc_lookup_de(), proc_readdir_de(), proc_root_readdir(), 1) de_put() ----------- de_put() is classic atomic_dec_and_test() refcount wrapper -- no BKL needed. BKL doesn't matter to possible refcount leak as well. 2) proc_lookup_de() ------------------- Walking PDE list is protected by proc_subdir_lock(), proc_get_inode() is potentially blocking, all callers of proc_lookup_de() eventually end up from ->lookup hooks which is protected by directory's ->i_mutex -- BKL doesn't protect anything. 3) proc_readdir_de() -------------------- "." and ".." part doesn't need BKL, walking PDE list is under proc_subdir_lock, calling filldir callback is potentially blocking because it writes to luserspace. All proc_readdir_de() callers eventually come from ->readdir hook which is under directory's ->i_mutex -- BKL doesn't protect anything. 4) proc_root_readdir_de() ------------------------- proc_root_readdir_de is ->readdir hook, see (3). Since readdir hooks doesn't use BKL anymore, switch to generic_file_llseek, since it also takes directory's i_mutex. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Diffstat (limited to 'fs/proc/inode.c')
-rw-r--r--fs/proc/inode.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 2543fd00c658..3e76bb9b3ad6 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -35,16 +35,13 @@ struct proc_dir_entry *de_get(struct proc_dir_entry *de)
*/
void de_put(struct proc_dir_entry *de)
{
- lock_kernel();
if (!atomic_read(&de->count)) {
printk("de_put: entry %s already free!\n", de->name);
- unlock_kernel();
return;
}
if (atomic_dec_and_test(&de->count))
free_proc_entry(de);
- unlock_kernel();
}
/*