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| author | Christoph Hellwig <hch@lst.de> | 2018-05-29 08:40:23 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-05-29 13:00:25 -0600 |
| commit | 5de815a7eedfacf593817ef34634eaa9b75a1482 (patch) | |
| tree | 13cca552662936096f7b306dc5dbb7b64dfdd93e /block/bsg-lib.c | |
| parent | b7405176b58aa475354f3c0d2ca1c560e9354288 (diff) | |
| download | linux-0-day-5de815a7eedfacf593817ef34634eaa9b75a1482.tar.gz linux-0-day-5de815a7eedfacf593817ef34634eaa9b75a1482.tar.xz | |
block: remove parent device reference from struct bsg_class_device
Bsg holding a reference to the parent device may result in a crash if a
bsg file handle is closed after the parent device driver has unloaded.
Holding a reference is not really needed: the parent device must exist
between bsg_register_queue and bsg_unregister_queue. Before the device
goes away the caller does blk_cleanup_queue so that all in-flight
requests to the device are gone and all new requests cannot pass beyond
the queue. The queue itself is a refcounted object and it will stay
alive with a bsg file.
Based on analysis, previous patch and changelog from Anatoliy Glagolev.
Reported-by: Anatoliy Glagolev <glagolig@gmail.com>
Reviewed-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bsg-lib.c')
| -rw-r--r-- | block/bsg-lib.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/block/bsg-lib.c b/block/bsg-lib.c index fc2e5ff2c4b9e..9419def8c0175 100644 --- a/block/bsg-lib.c +++ b/block/bsg-lib.c @@ -303,11 +303,9 @@ static void bsg_exit_rq(struct request_queue *q, struct request *req) * @name: device to give bsg device * @job_fn: bsg job handler * @dd_job_size: size of LLD data needed for each job - * @release: @dev release function */ struct request_queue *bsg_setup_queue(struct device *dev, const char *name, - bsg_job_fn *job_fn, int dd_job_size, - void (*release)(struct device *)) + bsg_job_fn *job_fn, int dd_job_size) { struct request_queue *q; int ret; @@ -331,7 +329,7 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name, blk_queue_softirq_done(q, bsg_softirq_done); blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT); - ret = bsg_register_queue(q, dev, name, &bsg_transport_ops, release); + ret = bsg_register_queue(q, dev, name, &bsg_transport_ops); if (ret) { printk(KERN_ERR "%s: bsg interface failed to " "initialize - register queue\n", dev->kobj.name); |