diff options
Diffstat (limited to 'usr/src/uts/common/io/blkdev/blkdev.c')
| -rw-r--r-- | usr/src/uts/common/io/blkdev/blkdev.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/usr/src/uts/common/io/blkdev/blkdev.c b/usr/src/uts/common/io/blkdev/blkdev.c index 0c80d15cfe..d3b96c9f8a 100644 --- a/usr/src/uts/common/io/blkdev/blkdev.c +++ b/usr/src/uts/common/io/blkdev/blkdev.c @@ -1819,6 +1819,16 @@ bd_attach_handle(dev_info_t *dip, bd_handle_t hdl) dev_info_t *child; bd_drive_t drive = { 0 }; + /* + * It's not an error if bd_attach_handle() is called on a handle that + * already is attached. We just ignore the request to attach and return. + * This way drivers using blkdev don't have to keep track about blkdev + * state, they can just call this function to make sure it attached. + */ + if (hdl->h_child != NULL) { + return (DDI_SUCCESS); + } + /* if drivers don't override this, make it assume none */ drive.d_lun = -1; hdl->h_ops.o_drive_info(hdl->h_private, &drive); @@ -1882,6 +1892,12 @@ bd_detach_handle(bd_handle_t hdl) int rv; char *devnm; + /* + * It's not an error if bd_detach_handle() is called on a handle that + * already is detached. We just ignore the request to detach and return. + * This way drivers using blkdev don't have to keep track about blkdev + * state, they can just call this function to make sure it detached. + */ if (hdl->h_child == NULL) { return (DDI_SUCCESS); } |