diff options
| 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 /drivers/scsi/scsi_transport_fc.c | |
| parent | b7405176b58aa475354f3c0d2ca1c560e9354288 (diff) | |
| download | lwn-5de815a7eedfacf593817ef34634eaa9b75a1482.tar.gz lwn-5de815a7eedfacf593817ef34634eaa9b75a1482.zip | |
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 'drivers/scsi/scsi_transport_fc.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_fc.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 7a9a65588a1b..1da3d71e9f61 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -3780,8 +3780,7 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host) snprintf(bsg_name, sizeof(bsg_name), "fc_host%d", shost->host_no); - q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, i->f->dd_bsg_size, - NULL); + q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, i->f->dd_bsg_size); if (IS_ERR(q)) { dev_err(dev, "fc_host%d: bsg interface failed to initialize - setup queue\n", @@ -3826,8 +3825,8 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport) if (!i->f->bsg_request) return -ENOTSUPP; - q = bsg_setup_queue(dev, NULL, fc_bsg_dispatch, i->f->dd_bsg_size, - NULL); + q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch, + i->f->dd_bsg_size); if (IS_ERR(q)) { dev_err(dev, "failed to setup bsg queue\n"); return PTR_ERR(q); |