cxlflash: Fix host link up event handling

Following a link up event, the LUNs available to the host may
have changed. Without rescanning the host, the LUN topology is
unknown to the user. In such a state, the user would be unable
to locate provisioned resources.

To remedy, the host should be rescanned after a link up event.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

drivers/scsi/cxlflash/common.h

@@ -102,6 +102,7 @@ struct cxlflash_cfg {
 	enum cxlflash_init_state init_state;
 	enum cxlflash_lr_state lr_state;
 	int lr_port;
+	atomic_t scan_host_needed;
 
 	struct cxl_afu *cxl_afu;