blockdev: Remove unused DriveInfo reference count

It's always one since commit fa510eb dropped the last drive_get_ref().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

blockdev.c

@@ -106,7 +106,7 @@ void blockdev_auto_del(BlockDriverState *bs)
     DriveInfo *dinfo = drive_get_by_blockdev(bs);
 
     if (dinfo && dinfo->auto_del) {
-        drive_put_ref(dinfo);
+        drive_del(dinfo);
     }
 }
 
@@ -213,7 +213,7 @@ static void bdrv_format_print(void *opaque, const char *name)
     error_printf(" %s", name);
 }
 
-static void drive_del(DriveInfo *dinfo)
+void drive_del(DriveInfo *dinfo)
 {
     if (dinfo->opts) {
         qemu_opts_del(dinfo->opts);
@@ -226,19 +226,6 @@ static void drive_del(DriveInfo *dinfo)
     g_free(dinfo);
 }
 
-void drive_put_ref(DriveInfo *dinfo)
-{
-    assert(dinfo->refcount);
-    if (--dinfo->refcount == 0) {
-        drive_del(dinfo);
-    }
-}
-
-void drive_get_ref(DriveInfo *dinfo)
-{
-    dinfo->refcount++;
-}
-
 typedef struct {
     QEMUBH *bh;
     BlockDriverState *bs;
@@ -497,7 +484,6 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
     dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
     dinfo->bdrv->read_only = ro;
     dinfo->bdrv->detect_zeroes = detect_zeroes;
-    dinfo->refcount = 1;
     QTAILQ_INSERT_TAIL(&drives, dinfo, next);
 
     bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);

device-hotplug.c

@@ -76,6 +76,6 @@ void drive_hot_add(Monitor *mon, const QDict *qdict)
 
 err:
     if (dinfo) {
-        drive_put_ref(dinfo);
+        drive_del(dinfo);
     }
 }

hw/ide/piix.c

@@ -184,7 +184,7 @@ int pci_piix3_xen_ide_unplug(DeviceState *dev)
             }
             bdrv_close(di->bdrv);
             pci_ide->bus[di->bus].ifs[di->unit].bs = NULL;
-            drive_put_ref(di);
+            drive_del(di);
         }
     }
     qdev_reset_all(DEVICE(dev));

include/sysemu/blockdev.h

@@ -43,21 +43,19 @@ struct DriveInfo {
     QemuOpts *opts;
     char *serial;
     QTAILQ_ENTRY(DriveInfo) next;
-    int refcount;
 };
 
 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index);
 int drive_get_max_bus(BlockInterfaceType type);
 DriveInfo *drive_get_next(BlockInterfaceType type);
-void drive_get_ref(DriveInfo *dinfo);
-void drive_put_ref(DriveInfo *dinfo);
 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs);
 
 QemuOpts *drive_def(const char *optstr);
 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
                     const char *optstr);
 DriveInfo *drive_new(QemuOpts *arg, BlockInterfaceType block_default_type);
+void drive_del(DriveInfo *dinfo);
 
 /* device-hotplug */