diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-05-29 09:40:23 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-05-29 22:00:25 +0300 |
| commit | 5de815a7eedfacf593817ef34634eaa9b75a1482 (patch) | |
| tree | 13cca552662936096f7b306dc5dbb7b64dfdd93e /include/linux/bsg.h | |
| parent | b7405176b58aa475354f3c0d2ca1c560e9354288 (diff) | |
| download | linux-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 'include/linux/bsg.h')
| -rw-r--r-- | include/linux/bsg.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/include/linux/bsg.h b/include/linux/bsg.h index 0c7dd9ceb139..dac37b6e00ec 100644 --- a/include/linux/bsg.h +++ b/include/linux/bsg.h @@ -17,17 +17,13 @@ struct bsg_ops { struct bsg_class_device { struct device *class_dev; - struct device *parent; int minor; struct request_queue *queue; - struct kref ref; const struct bsg_ops *ops; - void (*release)(struct device *); }; int bsg_register_queue(struct request_queue *q, struct device *parent, - const char *name, const struct bsg_ops *ops, - void (*release)(struct device *)); + const char *name, const struct bsg_ops *ops); int bsg_scsi_register_queue(struct request_queue *q, struct device *parent); void bsg_unregister_queue(struct request_queue *q); #else |