[PATCH] scsi: hisi_sas: Fix spin lock management in slot_index_alloc_quirk_v2_hw()

[John Garry]

Currently a spin_unlock_irqrestore() call is missing on the error path, so
add it.

Reported-by: Julia Lawall <julia.law...@lip6.fr>
Signed-off-by: John Garry <john.ga...@huawei.com>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c 
b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 70d6b28..cc36b64 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -806,8 +806,10 @@ static u32 hisi_sas_phy_read32(struct hisi_hba *hisi_hba,
        while (1) {
                start = find_next_zero_bit(bitmap,
                                        hisi_hba->slot_index_count, start);
-               if (start >= end)
+               if (start >= end) {
+                       spin_unlock_irqrestore(&hisi_hba->lock, flags);
                        return -SAS_QUEUE_FULL;
+               }
                /*
                  * SAS IPTT bit0 should be 1, and SATA IPTT bit0 should be 0.
                  */
-- 
1.9.1