linux-kernel - [PATCH 13/17] Update the SCSI disk driver to use ida helper functions.

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Date:	Wed, 16 Sep 2015 10:50:31 -0700
From:	Lee Duncan <lduncan@...e.com>
To:	linux-scsi@...r.kernel.org, James.Bottomley@...senPartnership.com
Cc:	linux-kernel@...r.kernel.org, hare@...e.com, jthumshirn@...e.de,
	hch@...radead.org, Lee Duncan <lduncan@...e.com>
Subject: [PATCH 13/17] Update the SCSI disk driver to use ida helper functions.

Signed-off-by: Lee Duncan <lduncan@...e.com>
---
 drivers/scsi/sd.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3b2fcb4fada0..60b2ad918208 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2948,15 +2948,7 @@ static int sd_probe(struct device *dev)
 	if (!gd)
 		goto out_free;
 
-	do {
-		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
-			goto out_put;
-
-		spin_lock(&sd_index_lock);
-		error = ida_get_new(&sd_index_ida, &index);
-		spin_unlock(&sd_index_lock);
-	} while (error == -EAGAIN);
-
+	error = ida_get_index(&sd_index_ida, &sd_index_lock, &index);
 	if (error) {
 		sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
 		goto out_put;
@@ -3001,9 +2993,7 @@ static int sd_probe(struct device *dev)
 	return 0;
 
  out_free_index:
-	spin_lock(&sd_index_lock);
-	ida_remove(&sd_index_ida, index);
-	spin_unlock(&sd_index_lock);
+	ida_put_index(&sd_index_ida, &sd_index_lock, index);
  out_put:
 	put_disk(gd);
  out_free:
@@ -3063,10 +3053,8 @@ static void scsi_disk_release(struct device *dev)
 {
 	struct scsi_disk *sdkp = to_scsi_disk(dev);
 	struct gendisk *disk = sdkp->disk;
-	
-	spin_lock(&sd_index_lock);
-	ida_remove(&sd_index_ida, sdkp->index);
-	spin_unlock(&sd_index_lock);
+
+	ida_put_index(&sd_index_ida, &sd_index_lock, sdkp->index);
 
 	blk_integrity_unregister(disk);
 	disk->private_data = NULL;
-- 
2.1.4

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