diff options
Diffstat (limited to 'lib/idr.c')
-rw-r--r-- | lib/idr.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/lib/idr.c b/lib/idr.c index 66a374892482..da36054c3ca0 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -100,7 +100,7 @@ EXPORT_SYMBOL_GPL(idr_alloc); * @end: The maximum ID (exclusive). * @gfp: Memory allocation flags. * - * Allocates an unused ID in the range specified by @nextid and @end. If + * Allocates an unused ID in the range specified by @start and @end. If * @end is <= 0, it is treated as one larger than %INT_MAX. This allows * callers to use @start + N as @end as long as N is within integer range. * The search for an unused ID will start at the last ID allocated and will @@ -215,7 +215,7 @@ int idr_for_each(const struct idr *idr, EXPORT_SYMBOL(idr_for_each); /** - * idr_get_next() - Find next populated entry. + * idr_get_next_ul() - Find next populated entry. * @idr: IDR handle. * @nextid: Pointer to an ID. * @@ -224,7 +224,7 @@ EXPORT_SYMBOL(idr_for_each); * to the ID of the found value. To use in a loop, the value pointed to by * nextid must be incremented by the user. */ -void *idr_get_next(struct idr *idr, int *nextid) +void *idr_get_next_ul(struct idr *idr, unsigned long *nextid) { struct radix_tree_iter iter; void __rcu **slot; @@ -245,18 +245,14 @@ void *idr_get_next(struct idr *idr, int *nextid) } if (!slot) return NULL; - id = iter.index + base; - - if (WARN_ON_ONCE(id > INT_MAX)) - return NULL; - *nextid = id; + *nextid = iter.index + base; return entry; } -EXPORT_SYMBOL(idr_get_next); +EXPORT_SYMBOL(idr_get_next_ul); /** - * idr_get_next_ul() - Find next populated entry. + * idr_get_next() - Find next populated entry. * @idr: IDR handle. * @nextid: Pointer to an ID. * @@ -265,22 +261,17 @@ EXPORT_SYMBOL(idr_get_next); * to the ID of the found value. To use in a loop, the value pointed to by * nextid must be incremented by the user. */ -void *idr_get_next_ul(struct idr *idr, unsigned long *nextid) +void *idr_get_next(struct idr *idr, int *nextid) { - struct radix_tree_iter iter; - void __rcu **slot; - unsigned long base = idr->idr_base; unsigned long id = *nextid; + void *entry = idr_get_next_ul(idr, &id); - id = (id < base) ? 0 : id - base; - slot = radix_tree_iter_find(&idr->idr_rt, &iter, id); - if (!slot) + if (WARN_ON_ONCE(id > INT_MAX)) return NULL; - - *nextid = iter.index + base; - return rcu_dereference_raw(*slot); + *nextid = id; + return entry; } -EXPORT_SYMBOL(idr_get_next_ul); +EXPORT_SYMBOL(idr_get_next); /** * idr_replace() - replace pointer for given ID. @@ -381,7 +372,8 @@ EXPORT_SYMBOL(idr_replace); * Allocate an ID between @min and @max, inclusive. The allocated ID will * not exceed %INT_MAX, even if @max is larger. * - * Context: Any context. + * Context: Any context. It is safe to call this function without + * locking in your code. * Return: The allocated ID, or %-ENOMEM if memory could not be allocated, * or %-ENOSPC if there are no free IDs. */ @@ -479,6 +471,7 @@ alloc: goto retry; nospc: xas_unlock_irqrestore(&xas, flags); + kfree(alloc); return -ENOSPC; } EXPORT_SYMBOL(ida_alloc_range); @@ -488,7 +481,8 @@ EXPORT_SYMBOL(ida_alloc_range); * @ida: IDA handle. * @id: Previously allocated ID. * - * Context: Any context. + * Context: Any context. It is safe to call this function without + * locking in your code. */ void ida_free(struct ida *ida, unsigned int id) { @@ -497,7 +491,8 @@ void ida_free(struct ida *ida, unsigned int id) struct ida_bitmap *bitmap; unsigned long flags; - BUG_ON((int)id < 0); + if ((int)id < 0) + return; xas_lock_irqsave(&xas, flags); bitmap = xas_load(&xas); @@ -513,7 +508,7 @@ void ida_free(struct ida *ida, unsigned int id) goto delete; xas_store(&xas, xa_mk_value(v)); } else { - if (!test_bit(bit, bitmap->bitmap)) + if (!bitmap || !test_bit(bit, bitmap->bitmap)) goto err; __clear_bit(bit, bitmap->bitmap); xas_set_mark(&xas, XA_FREE_MARK); @@ -540,7 +535,8 @@ EXPORT_SYMBOL(ida_free); * or freed. If the IDA is already empty, there is no need to call this * function. * - * Context: Any context. + * Context: Any context. It is safe to call this function without + * locking in your code. */ void ida_destroy(struct ida *ida) { |