RDMA/umad: Use kernel API to allocate umad indexes

Replace custom code to allocate indexes to generic kernel API.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index 9961859da06a59dee7f4cd391814e054645603fd..f55f48f6b27206ad512065cc3bf047f41b61609f 100644 (file)
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -138,7 +138,7 @@ static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
 static dev_t dynamic_umad_dev;
 static dev_t dynamic_issm_dev;
 
-static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
+static DEFINE_IDA(umad_ida);
 
 static void ib_umad_add_one(struct ib_device *device);
 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
@@ -1159,11 +1159,10 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
        dev_t base_umad;
        dev_t base_issm;
 
-       devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
-       if (devnum >= IB_UMAD_MAX_PORTS)
+       devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
+       if (devnum < 0)
                return -1;
        port->dev_num = devnum;
-       set_bit(devnum, dev_map);
        if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
                base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
                base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
@@ -1227,7 +1226,7 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
 
 err_cdev:
        cdev_del(&port->cdev);
-       clear_bit(devnum, dev_map);
+       ida_free(&umad_ida, devnum);
 
        return -1;
 }
@@ -1261,7 +1260,7 @@ static void ib_umad_kill_port(struct ib_umad_port *port)
        }
 
        mutex_unlock(&port->file_mutex);
-       clear_bit(port->dev_num, dev_map);
+       ida_free(&umad_ida, port->dev_num);
 }
 
 static void ib_umad_add_one(struct ib_device *device)