1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index d57566b8be0a..55310dbc10a6 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -107,6 +107,7 @@ static void scsi_disk_release(struct device *cdev);
 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 static void sd_print_result(struct scsi_disk *, int);
 
+static DEFINE_SPINLOCK(sd_index_lock);
 static DEFINE_IDA(sd_index_ida);
 
 /* This semaphore is used to mediate the 0->1 reference get in the
@@ -1914,7 +1915,9 @@ static int sd_probe(struct device *dev)
                 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);
 
         if (error)
@@ -1936,7 +1939,9 @@ 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);
  out_put:
         put_disk(gd);
  out_free:
@@ -1986,7 +1991,9 @@ 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);
 
         disk->private_data = NULL;
         put_disk(disk);