jffs2: avoid soft-lockup in jffs2_reserve_space_gc()

We triggered soft-lockup under stress test on 2.6.34 kernel.

BUG: soft lockup - CPU#1 stuck for 60009ms! [lockf2.test:14488]
...
[<bf09a4d4>] (jffs2_do_reserve_space+0x420/0x440 [jffs2])
[<bf09a528>] (jffs2_reserve_space_gc+0x34/0x78 [jffs2])
[<bf0a1350>] (jffs2_garbage_collect_dnode.isra.3+0x264/0x478 [jffs2])
[<bf0a2078>] (jffs2_garbage_collect_pass+0x9c0/0xe4c [jffs2])
[<bf09a670>] (jffs2_reserve_space+0x104/0x2a8 [jffs2])
[<bf09dc48>] (jffs2_write_inode_range+0x5c/0x4d4 [jffs2])
[<bf097d8c>] (jffs2_write_end+0x198/0x2c0 [jffs2])
[<c00e00a4>] (generic_file_buffered_write+0x158/0x200)
[<c00e14f4>] (__generic_file_aio_write+0x3a4/0x414)
[<c00e15c0>] (generic_file_aio_write+0x5c/0xbc)
[<c012334c>] (do_sync_write+0x98/0xd4)
[<c0123a84>] (vfs_write+0xa8/0x150)
[<c0123d74>] (sys_write+0x3c/0xc0)]

Fix this by adding a cond_resched() in the while loop.

[akpm@linux-foundation.org: don't initialize `ret']
Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index bbae5b1a833a..b6bd4affd9ad 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -212,20 +212,25 @@ out:
 int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
                            uint32_t *len, uint32_t sumsize)
 {
-        int ret = -EAGAIN;
+        int ret;
         minsize = PAD(minsize);
 
         jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize);
 
-        spin_lock(&c->erase_completion_lock);
-        while(ret == -EAGAIN) {
+        while (true) {
+                spin_lock(&c->erase_completion_lock);
                 ret = jffs2_do_reserve_space(c, minsize, len, sumsize);
                 if (ret) {
                         jffs2_dbg(1, "%s(): looping, ret is %d\n",
                                   __func__, ret);
                 }
+                spin_unlock(&c->erase_completion_lock);
+
+                if (ret == -EAGAIN)
+                        cond_resched();
+                else
+                        break;
         }
-        spin_unlock(&c->erase_completion_lock);
         if (!ret)
                 ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);