atm/nicstar: convert to idr_alloc()

Convert to the much saner new idr interface.  The existing code looks
buggy to me - ID 0 is treated as no-ID but allocation specifies 0 as
lower limit and there's no error handling after partial success.  This
conversion keeps the bugs unchanged.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Chas Williams <chas@cmf.nrl.navy.mil>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 18 deletions

diff --git a/drivers/atm/nicstar.c b/drivers/atm/nicstar.c
index 628787ed999c..6587dc295eb0 100644
--- a/drivers/atm/nicstar.c
+++ b/drivers/atm/nicstar.c
@@ -949,11 +949,10 @@ static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 {
         struct sk_buff *handle1, *handle2;
-        u32 id1 = 0, id2 = 0;
+        int id1, id2;
         u32 addr1, addr2;
         u32 stat;
         unsigned long flags;
-        int err;
 
         /* *BARF* */
         handle2 = NULL;
@@ -1026,23 +1025,12 @@ static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
                                 card->lbfqc += 2;
                 }
 
-                do {
-                        if (!idr_pre_get(&card->idr, GFP_ATOMIC)) {
-                                printk(KERN_ERR
-                                       "nicstar%d: no free memory for idr\n",
-                                       card->index);
-                                goto out;
-                        }
-
-                        if (!id1)
-                                err = idr_get_new_above(&card->idr, handle1, 0, &id1);
-
-                        if (!id2 && err == 0)
-                                err = idr_get_new_above(&card->idr, handle2, 0, &id2);
-
-                } while (err == -EAGAIN);
+                id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
+                if (id1 < 0)
+                        goto out;
 
-                if (err)
+                id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
+                if (id2 < 0)
                         goto out;
 
                 spin_lock_irqsave(&card->res_lock, flags);