firewire: convert to idr_alloc()

Convert to the much saner new idr interface.

v2: Stefan pointed out that add_client_resource() may be called from
    non-process context.  Preload iff @gfp_mask contains __GFP_WAIT.
    Also updated to include minor upper limit check.

[tim.gardner@canonical.com: fix accidentally orphaned 'minor'[
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index af3e8aa5eedc..03ce7d980c6a 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -1017,16 +1017,11 @@ static void fw_device_init(struct work_struct *work)
 
         fw_device_get(device);
         down_write(&fw_device_rwsem);
-        ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
-              idr_get_new(&fw_device_idr, device, &minor) :
-              -ENOMEM;
-        if (minor >= 1 << MINORBITS) {
-                idr_remove(&fw_device_idr, minor);
-                minor = -ENOSPC;
-        }
+        minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,
+                        GFP_KERNEL);
         up_write(&fw_device_rwsem);
 
-        if (ret < 0)
+        if (minor < 0)
                 goto error;
 
         device->device.bus = &fw_bus_type;