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| author | Linus Walleij <linus.walleij@linaro.org> | 2014-03-14 10:26:45 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-03-14 10:26:45 +0100 |
| commit | 9e294427f6e427dbaf46140303acded06365f53c (patch) | |
| tree | 0669100cbd79fe8612463900171c98873d8dc454 /mm/swapfile.c | |
| parent | gpio: clamp returned values to the boolean range (diff) | |
| parent | Linux 3.14-rc6 (diff) | |
| download | linux-9e294427f6e427dbaf46140303acded06365f53c.tar.xz linux-9e294427f6e427dbaf46140303acded06365f53c.zip | |
Merge tag 'v3.14-rc6' into devel
Linux 3.14-rc6
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index c6c13b050a58..4a7f7e6992b6 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1923,7 +1923,6 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) p->swap_map = NULL; cluster_info = p->cluster_info; p->cluster_info = NULL; - p->flags = 0; frontswap_map = frontswap_map_get(p); spin_unlock(&p->lock); spin_unlock(&swap_lock); @@ -1949,6 +1948,16 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) mutex_unlock(&inode->i_mutex); } filp_close(swap_file, NULL); + + /* + * Clear the SWP_USED flag after all resources are freed so that swapon + * can reuse this swap_info in alloc_swap_info() safely. It is ok to + * not hold p->lock after we cleared its SWP_WRITEOK. + */ + spin_lock(&swap_lock); + p->flags = 0; + spin_unlock(&swap_lock); + err = 0; atomic_inc(&proc_poll_event); wake_up_interruptible(&proc_poll_wait); |