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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-21 21:32:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-21 21:32:38 -0800 |
| commit | a5d6e63323fe7799eb0e6fd0a41fbfad10fca258 (patch) | |
| tree | ca52285fc4ac7fa25a8e1621782a5a51130ac08b /fs | |
| parent | 78dc53c422172a317adb0776dfb687057ffa28b7 (diff) | |
| parent | 7aa555bf26763b86332c7a3689701c999834b87a (diff) | |
| download | linux-a5d6e63323fe7799eb0e6fd0a41fbfad10fca258.tar.gz | |
Merge branch 'akpm' (fixes from Andrew)
Merge patches from Andrew Morton: "13 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm: place page->pmd_huge_pte to right union MAINTAINERS: add keyboard driver to Hyper-V file list x86, mm: do not leak page->ptl for pmd page tables ipc,shm: correct error return value in shmctl (SHM_UNLOCK) mm, mempolicy: silence gcc warning block/partitions/efi.c: fix bound check ARM: drivers/rtc/rtc-at91rm9200.c: disable interrupts at shutdown mm: hugetlbfs: fix hugetlbfs optimization kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS cleanly ipc,shm: fix shm_file deletion races mm: thp: give transparent hugepage code a separate copy_page checkpatch: fix "Use of uninitialized value" warnings configfs: fix race between dentry put and lookup
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/configfs/dir.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 4522e0755773..e081acbac2e7 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -56,10 +56,19 @@ static void configfs_d_iput(struct dentry * dentry, struct configfs_dirent *sd = dentry->d_fsdata; if (sd) { - BUG_ON(sd->s_dentry != dentry); /* Coordinate with configfs_readdir */ spin_lock(&configfs_dirent_lock); - sd->s_dentry = NULL; + /* Coordinate with configfs_attach_attr where will increase + * sd->s_count and update sd->s_dentry to new allocated one. + * Only set sd->dentry to null when this dentry is the only + * sd owner. + * If not do so, configfs_d_iput may run just after + * configfs_attach_attr and set sd->s_dentry to null + * even it's still in use. + */ + if (atomic_read(&sd->s_count) <= 2) + sd->s_dentry = NULL; + spin_unlock(&configfs_dirent_lock); configfs_put(sd); } @@ -416,8 +425,11 @@ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * den struct configfs_attribute * attr = sd->s_element; int error; + spin_lock(&configfs_dirent_lock); dentry->d_fsdata = configfs_get(sd); sd->s_dentry = dentry; + spin_unlock(&configfs_dirent_lock); + error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG, configfs_init_file); if (error) { |