mfd: convert to idr_alloc()

Convert to the much saner new idr interface.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mfd/rtsx_pcr.c

@@ -1091,15 +1091,14 @@ static int rtsx_pci_probe(struct pci_dev *pcidev,
 	}
 	handle->pcr = pcr;
 
-	if (!idr_pre_get(&rtsx_pci_idr, GFP_KERNEL)) {
+	idr_preload(GFP_KERNEL);
-		ret = -ENOMEM;
-		goto free_handle;
-	}
-
 	spin_lock(&rtsx_pci_lock);
-	ret = idr_get_new(&rtsx_pci_idr, pcr, &pcr->id);
+	ret = idr_alloc(&rtsx_pci_idr, pcr, 0, 0, GFP_NOWAIT);
+	if (ret >= 0)
+		pcr->id = ret;
 	spin_unlock(&rtsx_pci_lock);
-	if (ret)
+	idr_preload_end();
+	if (ret < 0)
 		goto free_handle;
 
 	pcr->pci = pcidev;