forked from mirrors/linux
5de815a7ee
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>
39 lines
1,012 B
C
39 lines
1,012 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BSG_H
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#define _LINUX_BSG_H
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#include <uapi/linux/bsg.h>
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struct request;
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#ifdef CONFIG_BLK_DEV_BSG
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struct bsg_ops {
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int (*check_proto)(struct sg_io_v4 *hdr);
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int (*fill_hdr)(struct request *rq, struct sg_io_v4 *hdr,
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fmode_t mode);
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int (*complete_rq)(struct request *rq, struct sg_io_v4 *hdr);
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void (*free_rq)(struct request *rq);
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};
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struct bsg_class_device {
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struct device *class_dev;
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int minor;
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struct request_queue *queue;
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const struct bsg_ops *ops;
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};
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int bsg_register_queue(struct request_queue *q, struct device *parent,
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const char *name, const struct bsg_ops *ops);
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int bsg_scsi_register_queue(struct request_queue *q, struct device *parent);
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void bsg_unregister_queue(struct request_queue *q);
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#else
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static inline int bsg_scsi_register_queue(struct request_queue *q,
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struct device *parent)
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{
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return 0;
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}
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static inline void bsg_unregister_queue(struct request_queue *q)
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{
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}
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#endif /* CONFIG_BLK_DEV_BSG */
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#endif /* _LINUX_BSG_H */
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