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>

diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 68c31381cd0382159ca361959bea54002ce44dd8..27ac423ab25e26e3a78defb81fcdad21b1050f9d 100644 (file)
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -487,27 +487,28 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
 static int add_client_resource(struct client *client,
                               struct client_resource *resource, gfp_t gfp_mask)
 {
+       bool preload = gfp_mask & __GFP_WAIT;
        unsigned long flags;
        int ret;
 
- retry:
-       if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
-               return -ENOMEM;
-
+       if (preload)
+               idr_preload(gfp_mask);
        spin_lock_irqsave(&client->lock, flags);
+
        if (client->in_shutdown)
                ret = -ECANCELED;
        else
-               ret = idr_get_new(&client->resource_idr, resource,
-                                 &resource->handle);
+               ret = idr_alloc(&client->resource_idr, resource, 0, 0,
+                               GFP_NOWAIT);
        if (ret >= 0) {
+               resource->handle = ret;
                client_get(client);
                schedule_if_iso_resource(resource);
        }
-       spin_unlock_irqrestore(&client->lock, flags);
 
-       if (ret == -EAGAIN)
-               goto retry;
+       spin_unlock_irqrestore(&client->lock, flags);
+       if (preload)
+               idr_preload_end();
 
        return ret < 0 ? ret : 0;
 }

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index af3e8aa5eedc90b90bf572a222536100987c77cc..03ce7d980c6ac4d83015e83731d032d778d482aa 100644 (file)
--- 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;