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| author | Li Zefan <lizefan@huawei.com> | 2014-02-12 12:44:56 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-04-30 16:23:21 +0100 |
| commit | 62a9eee371b54d6c56f9867b193f4a2410c50c05 (patch) | |
| tree | 411b2701fd235948f0c7ce291e7d80b4e12601b8 /fs/jffs2 | |
| parent | 22af2c501a2c1980e848ce138031ed1cab278f55 (diff) | |
| download | kernel_samsung_smdk4412-62a9eee371b54d6c56f9867b193f4a2410c50c05.zip kernel_samsung_smdk4412-62a9eee371b54d6c56f9867b193f4a2410c50c05.tar.gz kernel_samsung_smdk4412-62a9eee371b54d6c56f9867b193f4a2410c50c05.tar.bz2 | |
jffs2: avoid soft-lockup in jffs2_reserve_space_gc()
commit 13b546d96207c131eeae15dc7b26c6e7d0f1cad7 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs/jffs2')
| -rw-r--r-- | fs/jffs2/nodemgmt.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c index 7c93960..145ba39 100644 --- a/fs/jffs2/nodemgmt.c +++ b/fs/jffs2/nodemgmt.c @@ -159,19 +159,24 @@ int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, 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); D1(printk(KERN_DEBUG "jffs2_reserve_space_gc(): Requested 0x%x bytes\n", 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) { D1(printk(KERN_DEBUG "jffs2_reserve_space_gc: looping, ret is %d\n", 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); |