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| author | Tom Zanussi <zanussi@comcast.net> | 2008-12-09 13:14:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-10 08:01:52 -0800 |
| commit | fbb5b7ae4b442f1923513dc6165a66c7a7f29073 (patch) | |
| tree | e49f1c838a58912a36d03e12d1dab44d2df439d6 /kernel/relay.c | |
| parent | 361371201b60ffd686a694c848c1d5ad6061725f (diff) | |
| download | lwn-fbb5b7ae4b442f1923513dc6165a66c7a7f29073.tar.gz lwn-fbb5b7ae4b442f1923513dc6165a66c7a7f29073.zip | |
relayfs: fix infinite loop with splice()
Running kmemtraced, which uses splice() on relayfs, causes a hard lock on
x86-64 SMP. As described by Tom Zanussi:
It looks like you hit the same problem as described here:
commit 8191ecd1d14c6914c660dfa007154860a7908857
splice: fix infinite loop in generic_file_splice_read()
relay uses the same loop but it never got noticed or fixed.
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Tested-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/relay.c')
| -rw-r--r-- | kernel/relay.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index 32b0befdcb6a..09ac2008f77b 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -1317,12 +1317,9 @@ static ssize_t relay_file_splice_read(struct file *in, if (ret < 0) break; else if (!ret) { - if (spliced) - break; - if (flags & SPLICE_F_NONBLOCK) { + if (flags & SPLICE_F_NONBLOCK) ret = -EAGAIN; - break; - } + break; } *ppos += ret; |