IB/ucm: Use stack variable 'devnum' in ib_ucm_add_one

This change is not useful by itself, but sets us up for a future
change that allows us to dynamically allocate device numbers in case
we have more than IB_UCM_MAX_DEVICES in the system.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index f504c9b..7ff3300 100644 (file)
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -1239,6 +1239,7 @@ static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 
 static void ib_ucm_add_one(struct ib_device *device)
 {
+       int devnum;
        struct ib_ucm_device *ucm_dev;
 
        if (!device->alloc_ucontext ||
@@ -1251,16 +1252,17 @@ static void ib_ucm_add_one(struct ib_device *device)
 
        ucm_dev->ib_dev = device;
 
-       ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
-       if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
+       devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
+       if (devnum >= IB_UCM_MAX_DEVICES)
                goto err;
 
-       set_bit(ucm_dev->devnum, dev_map);
+       ucm_dev->devnum = devnum;
+       set_bit(devnum, dev_map);
 
        cdev_init(&ucm_dev->cdev, &ucm_fops);
        ucm_dev->cdev.owner = THIS_MODULE;
        kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
-       if (cdev_add(&ucm_dev->cdev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
+       if (cdev_add(&ucm_dev->cdev, IB_UCM_BASE_DEV + devnum, 1))
                goto err;
 
        ucm_dev->dev.class = &cm_class;
@@ -1281,7 +1283,7 @@ err_dev:
        device_unregister(&ucm_dev->dev);
 err_cdev:
        cdev_del(&ucm_dev->cdev);
-       clear_bit(ucm_dev->devnum, dev_map);
+       clear_bit(devnum, dev_map);
 err:
        kfree(ucm_dev);
        return;