Showing error 627

User: Jiri Slaby
Error type: Double Unlock
Error type description: Some lock is unlocked twice unintentionally in a sequence
File location: fs/dcache.c
Line in file: 229
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2011-11-07 22:20:57 UTC

Source: 

 199 * on the compiler to always get this right (gcc generally doesn't).
 200 * Real recursion would eat up our stack space.
 201 */
 202
 203/*
 204 * dput - release a dentry
 205 * @dentry: dentry to release 
 206 *
 207 * Release a dentry. This will drop the usage count and if appropriate
 208 * call the dentry unlink method as well as removing it from the queues and
 209 * releasing its resources. If the parent dentries were scheduled for release
 210 * they too may now get deleted.
 211 *
 212 * no dcache lock, please.
 213 */
 214
 215void dput(struct dentry *dentry)
 216{
 217        if (!dentry)
 218                return;
 219
 220repeat:
 221        if (atomic_read(&dentry->d_count) == 1)
 222                might_sleep();
 223        if (!atomic_dec_and_lock(&dentry->d_count, &dcache_lock))
 224                return;
 225
 226        spin_lock(&dentry->d_lock);
 227        if (atomic_read(&dentry->d_count)) {
 228                spin_unlock(&dentry->d_lock);
 229                spin_unlock(&dcache_lock);
 230                return;
 231        }
 232
 233        /*
 234         * AV: ->d_delete() is _NOT_ allowed to block now.
 235         */
 236        if (dentry->d_op && dentry->d_op->d_delete) {
 237                if (dentry->d_op->d_delete(dentry))
 238                        goto unhash_it;
 239        }
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