scsi: leapraid: Balance host references for firmware log VMAs

leapraid_fw_mmap() keeps the Scsi_Host reference obtained while looking up
the adapter for the lifetime of the initial VMA.  The VMA close callback
drops that reference.

The open callback is also invoked when a VMA is duplicated or split, but it
only increments mmap_refcnt.  Since every corresponding close callback
drops a host reference, cloning the mapping can release the host while
another VMA still refers to the adapter.

Take a host device reference for every VMA open and release the lookup
reference once the initial mapping has acquired its own reference.  Use
get_device() because a VMA can be cloned after the host enters SHOST_DEL;
an existing VMA still pins the host at that point and open cannot fail.

Fixes: 5597088c9e79 ("scsi: leapraid: Add new SCSI driver")
Signed-off-by: Linmao Li <lilinmao@kylinos.cn>
Reviewed-by: Dongdong Hao <doubled@leap-io-kernel.com>
Link: https://patch.msgid.link/20260814033845.2971706-2-lilinmao@kylinos.cn
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

0 files changed, 0 insertions, 0 deletions