1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index be55859042cd..34cea8291772 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -77,11 +77,16 @@ inline int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out)
 {
         unsigned int tag;
         void *bitmap = pm8001_ha->tags;
+        unsigned long flags;
 
+        spin_lock_irqsave(&pm8001_ha->bitmap_lock, flags);
         tag = find_first_zero_bit(bitmap, pm8001_ha->tags_num);
-        if (tag >= pm8001_ha->tags_num)
+        if (tag >= pm8001_ha->tags_num) {
+                spin_unlock_irqrestore(&pm8001_ha->bitmap_lock, flags);
                 return -SAS_QUEUE_FULL;
+        }
         set_bit(tag, bitmap);
+        spin_unlock_irqrestore(&pm8001_ha->bitmap_lock, flags);
         *tag_out = tag;
         return 0;
 }