tree f620055da979b1af58bfdac16f35f90cd67e6f13
parent 0e4ff797d7f2f2bb860b8f31dc5d1f2273b2f05a
author FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> 1206925418 +0900
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1208537239 -0500

[SCSI] bsg: takes a ref to struct device in fops->open

bsg_register_queue() takes a ref to struct device that a caller
passes. For example, bsg takes a ref to the sdev_gendev for scsi
devices. However, bsg doesn't inrease the refcount in fops->open. So
while an application opens a bsg device, the scsi device that the bsg
device holds can go away (bsg also takes a ref to a queue, but it
doesn't prevent the device from going away).

With this patch, bsg increases the refcount of struct device in
fops->open and decreases it in fops->release.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>