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| author |   Julia Lawall <julia@diku.dk> | 2010-03-10 15:23:52 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-12 15:52:43 -0800 |
| commit | 0fbcae222b8aa3a47034a484e02e7fc14050c783 (patch) | |
| tree | bd1dc7bb8c912e7f29f490aebcf7270141072e26 /drivers/char/mmtimer.c | |
| parent | w1: mxc_w1: move probe() and remove() to the dev* text area (diff) | |
| download | linux-dev-0fbcae222b8aa3a47034a484e02e7fc14050c783.tar.xz linux-dev-0fbcae222b8aa3a47034a484e02e7fc14050c783.zip | |
drivers/char/mmtimer.c: eliminate useless code
The variable x is initialized twice to the same (side effect-free)
expression. Drop one initialization.
A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)
// <smpl>
@forall@
idexpression *x;
identifier f!=ERR_PTR;
@@
x = f(...)
... when != x
(
x = f(...,<+...x...+>,...)
|
* x = f(...)
)
// </smpl>
Stefan observed:
The next x = rb_entry(mn->next, struct mmtimer, list); is preceded by a
test whether mn->next is NULL.
Unless that test is redundant too, your patch fixes a potential NULL
pointer dereference, introduced by commit cbacdd95 "SGI Altix mmtimer:
allow larger number of timers per node" in 2.6.26.
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/mmtimer.c')
| -rw-r--r-- | drivers/char/mmtimer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c index 918711aa56f3..04fd0d843b3b 100644 --- a/drivers/char/mmtimer.c +++ b/drivers/char/mmtimer.c @@ -546,7 +546,7 @@ static void mmtimer_tasklet(unsigned long data) { int nodeid = data; struct mmtimer_node *mn = &timers[nodeid]; - struct mmtimer *x = rb_entry(mn->next, struct mmtimer, list); + struct mmtimer *x; struct k_itimer *t; unsigned long flags; |