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| author | Chuansheng Liu <chuansheng.liu@intel.com> | 2012-09-18 01:43:44 +0800 |
|---|---|---|
| committer | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-09-20 17:04:50 -0700 |
| commit | 80c9d03c22f13a17df67b4b99a83ed5e9acf6093 (patch) | |
| tree | f12fb83065cf66ca699173a3520d5a37b7860054 /fs/pstore | |
| parent | 65f8c95e46a1827ae8bbc52a817ea308dd7d65ae (diff) | |
| download | linux-80c9d03c22f13a17df67b4b99a83ed5e9acf6093.tar.gz linux-80c9d03c22f13a17df67b4b99a83ed5e9acf6093.tar.bz2 linux-80c9d03c22f13a17df67b4b99a83ed5e9acf6093.zip | |
pstore: Avoid recursive spinlocks in the oops_in_progress case
Like 8250 driver, when pstore is registered as a console,
to avoid recursive spinlocks when panic happening, change the
spin_lock_irqsave to spin_trylock_irqsave when oops_in_progress
is true.
Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'fs/pstore')
| -rw-r--r-- | fs/pstore/platform.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 6c23eab7f76c..a40da07e93d6 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -164,7 +164,13 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) if (c > psinfo->bufsize) c = psinfo->bufsize; - spin_lock_irqsave(&psinfo->buf_lock, flags); + + if (oops_in_progress) { + if (!spin_trylock_irqsave(&psinfo->buf_lock, flags)) + break; + } else { + spin_lock_irqsave(&psinfo->buf_lock, flags); + } memcpy(psinfo->buf, s, c); psinfo->write(PSTORE_TYPE_CONSOLE, 0, NULL, 0, c, psinfo); spin_unlock_irqrestore(&psinfo->buf_lock, flags); |