Staging: hv: storvsc: Support hot add of scsi disks

Support hot add of scsi disks.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 9153641f7946dce371f357fcc7a3c81efb348974..7c82d148f32e5d3b9c607b16faba0bdee61ef8ed 100644 (file)
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -304,6 +304,30 @@ struct storvsc_cmd_request {
        struct hv_storvsc_request request;
 };
 
+struct storvsc_scan_work {
+       struct work_struct work;
+       struct Scsi_Host *host;
+       uint lun;
+};
+
+static void storvsc_bus_scan(struct work_struct *work)
+{
+       struct storvsc_scan_work *wrk;
+       int id, order_id;
+
+       wrk = container_of(work, struct storvsc_scan_work, work);
+       for (id = 0; id < wrk->host->max_id; ++id) {
+               if (wrk->host->reverse_ordering)
+                       order_id = wrk->host->max_id - id - 1;
+               else
+                       order_id = id;
+
+               scsi_scan_target(&wrk->host->shost_gendev, 0,
+                               order_id, SCAN_WILD_CARD, 1);
+       }
+       kfree(wrk);
+}
+
 static inline struct storvsc_device *get_out_stor_device(
                                        struct hv_device *device)
 {
@@ -551,11 +575,25 @@ static void storvsc_on_receive(struct hv_device *device,
                             struct vstor_packet *vstor_packet,
                             struct hv_storvsc_request *request)
 {
+       struct storvsc_scan_work *work;
+       struct storvsc_device *stor_device;
+
        switch (vstor_packet->operation) {
        case VSTOR_OPERATION_COMPLETE_IO:
                storvsc_on_io_completion(device, vstor_packet, request);
                break;
+
        case VSTOR_OPERATION_REMOVE_DEVICE:
+       case VSTOR_OPERATION_ENUMERATE_BUS:
+               stor_device = get_in_stor_device(device);
+               work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
+               if (!work)
+                       return;
+
+               INIT_WORK(&work->work, storvsc_bus_scan);
+               work->host = stor_device->host;
+               schedule_work(&work->work);
+               break;
 
        default:
                break;