• FUJITA Tomonori's avatar
    [SCSI] bsg: add release callback support · 97f46ae4
    FUJITA Tomonori authored
    This patch adds release callback support, which is called when a bsg
    device goes away. bsg_register_queue() takes a pointer to a callback
    function. This feature is useful for stuff like sas_host that can't
    use the release callback in struct device.
    
    If a caller doesn't need bsg's release callback, it can call
    bsg_register_queue() with NULL pointer (e.g. scsi devices can use
    release callback in struct device so they don't need bsg's callback).
    
    With this patch, bsg uses kref for refcounts on bsg devices instead of
    get/put_device in fops->open/release. bsg calls put_device and the
    caller's release callback (if it was registered) in kref_put's
    release.
    Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
    97f46ae4
bsg.h 2.7 KB