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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/misc | |
parent | 582ef52a5d5650931f6d76c81d824bd98419ac8a (diff) | |
download | linux-0fbcae222b8aa3a47034a484e02e7fc14050c783.tar.bz2 |
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/misc')
0 files changed, 0 insertions, 0 deletions