linux-kernel - [PATCH 08/17] Update the mmc driver to use idr helper functions.

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Date:	Tue, 15 Sep 2015 09:46:08 -0700
From:	Lee Duncan <lduncan@...e.com>
To:	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc:	Hannes Reinecke <hare@...e.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Lee Duncan <lduncan@...e.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 08/17] Update the mmc driver to use idr helper functions.

Signed-off-by: Lee Duncan <lduncan@...e.com>
---
 drivers/mmc/core/host.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 99a9c9011c50..5aa2330f074c 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -40,9 +40,8 @@ static DEFINE_SPINLOCK(mmc_host_lock);
 static void mmc_host_classdev_release(struct device *dev)
 {
 	struct mmc_host *host = cls_dev_to_mmc_host(dev);
-	spin_lock(&mmc_host_lock);
-	idr_remove(&mmc_host_idr, host->index);
-	spin_unlock(&mmc_host_lock);
+
+	idr_put_index(&mmc_host_idr, &mmc_host_lock, host->index);
 	kfree(host);
 }
 
@@ -559,17 +558,12 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 
 	/* scanning will be enabled when we're ready */
 	host->rescan_disable = 1;
-	idr_preload(GFP_KERNEL);
-	spin_lock(&mmc_host_lock);
-	err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
-	if (err >= 0)
-		host->index = err;
-	spin_unlock(&mmc_host_lock);
-	idr_preload_end();
+	err = idr_get_index(&mmc_host_idr, &mmc_host_lock, host);
 	if (err < 0) {
 		kfree(host);
 		return NULL;
 	}
+	host->index = err;
 
 	dev_set_name(&host->class_dev, "mmc%d", host->index);
 
-- 
2.1.4

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