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blk-mq: Use proper cpumask iterator

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queue_for_each_ctx() iterates over per_cpu variables under the assumption that
the possible cpu mask cannot have holes. That's wrong as all cpumasks can have
holes. In case there are holes the iteration ends up accessing uninitialized
memory and crashing as a result.

Replace the macro by a proper for_each_possible_cpu() loop and drop the unused
macro blk_ctx_sum() which references queue_for_each_ctx().

Reported-by: Xiong Zhou <jencce.kernel@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Thomas Gleixner 2016-03-19 11:30:33 +01:00 committed by Jens Axboe
parent 5173cb814b
commit 897bb0c7f1
3 changed files with 6 additions and 17 deletions
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6
block/blk-mq-sysfs.c
View File

@ -416,12 +416,14 @@ void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
static void blk_mq_sysfs_init(struct request_queue *q)
{
struct blk_mq_ctx *ctx;
int i;
int cpu;
kobject_init(&q->mq_kobj, &blk_mq_ktype);
queue_for_each_ctx(q, ctx, i)
for_each_possible_cpu(cpu) {
ctx = per_cpu_ptr(q->queue_ctx, cpu);
kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
}
}
int blk_mq_register_disk(struct gendisk *disk)

3
block/blk-mq.c
View File

@ -1798,11 +1798,12 @@ static void blk_mq_map_swqueue(struct request_queue *q,
/*
* Map software to hardware queues
*/
queue_for_each_ctx(q, ctx, i) {
for_each_possible_cpu(i) {
/* If the cpu isn't online, the cpu is mapped to first hctx */
if (!cpumask_test_cpu(i, online_mask))
continue;
ctx = per_cpu_ptr(q->queue_ctx, i);
hctx = q->mq_ops->map_queue(q, i);
cpumask_set_cpu(i, hctx->cpumask);

14
include/linux/blk-mq.h
View File

@ -263,22 +263,8 @@ static inline void *blk_mq_rq_to_pdu(struct request *rq)
for ((i) = 0; (i) < (q)->nr_hw_queues && \
({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
#define queue_for_each_ctx(q, ctx, i) \
for ((i) = 0; (i) < (q)->nr_queues && \
({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
#define hctx_for_each_ctx(hctx, ctx, i) \
for ((i) = 0; (i) < (hctx)->nr_ctx && \
({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
#define blk_ctx_sum(q, sum) \
({ \
struct blk_mq_ctx *__x; \
unsigned int __ret = 0, __i; \
\
queue_for_each_ctx((q), __x, __i) \
__ret += sum; \
__ret; \
})
#endif