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| author | Ingo Molnar <mingo@elte.hu> | 2008-12-02 20:09:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-02 20:09:50 +0100 |
| commit | a64d31baed104be25305e9c71585d3ea4ee9a418 (patch) | |
| tree | 470e3c59ef39f38bcd69f8fef7dba8f76afbec53 /lib | |
| parent | 1c39194878c09bd88ffc9c9d4c2f01c3397c7aed (diff) | |
| parent | 061e41fdb5047b1fb161e89664057835935ca1d2 (diff) | |
| download | linux-a64d31baed104be25305e9c71585d3ea4ee9a418.tar.bz2 | |
Merge branch 'linus' into cpus4096
Conflicts:
kernel/trace/ring_buffer.c
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/idr.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/idr.c b/lib/idr.c index e728c7fccc4d..7a785a0c2ea0 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -185,6 +185,7 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa) new = get_from_free_list(idp); if (!new) return -1; + new->layer = l-1; rcu_assign_pointer(p->ary[m], new); p->count++; } @@ -210,6 +211,7 @@ build_up: if (unlikely(!p)) { if (!(p = get_from_free_list(idp))) return -1; + p->layer = 0; layers = 1; } /* @@ -237,6 +239,7 @@ build_up: } new->ary[0] = p; new->count = 1; + new->layer = layers-1; if (p->bitmap == IDR_FULL) __set_bit(0, &new->bitmap); p = new; @@ -493,17 +496,21 @@ void *idr_find(struct idr *idp, int id) int n; struct idr_layer *p; - n = idp->layers * IDR_BITS; p = rcu_dereference(idp->top); + if (!p) + return NULL; + n = (p->layer+1) * IDR_BITS; /* Mask off upper bits we don't use for the search. */ id &= MAX_ID_MASK; if (id >= (1 << n)) return NULL; + BUG_ON(n == 0); while (n > 0 && p) { n -= IDR_BITS; + BUG_ON(n != p->layer*IDR_BITS); p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]); } return((void *)p); @@ -582,8 +589,11 @@ void *idr_replace(struct idr *idp, void *ptr, int id) int n; struct idr_layer *p, *old_p; - n = idp->layers * IDR_BITS; p = idp->top; + if (!p) + return ERR_PTR(-EINVAL); + + n = (p->layer+1) * IDR_BITS; id &= MAX_ID_MASK; |