[PATCH 4/6] scsi: hpsa: Ignore HBA flag from NVRAM if logical devices exist

[Ivan Mironov]

Simultaneous use of physical devices and logical RAID devices may be
dangerous.

Signed-off-by: Ivan Mironov <mironov.i...@gmail.com>
---
 drivers/scsi/hpsa.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 60f1f7949d8d..0b5b3a651b70 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4364,10 +4364,11 @@ static int hpsa_nvram_hba_flag_enabled(struct ctlr_info 
*h, bool *flag_enabled)
        return rc;
 }
 
-static int hpsa_update_nvram_hba_mode(struct ctlr_info *h)
+static int hpsa_update_nvram_hba_mode(struct ctlr_info *h, u32 nlogicals)
 {
        int rc;
        bool flag_enabled;
+       bool ignore;
 
        if (!hpsa_use_nvram_hba_flag)
                return 0;
@@ -4378,10 +4379,13 @@ static int hpsa_update_nvram_hba_mode(struct ctlr_info 
*h)
        if (rc)
                return rc;
 
-       dev_info(&h->pdev->dev, "NVRAM HBA flag: %s\n",
-               flag_enabled ? "enabled" : "disabled");
+       ignore = flag_enabled && nlogicals;
 
-       h->nvram_hba_mode_enabled = flag_enabled;
+       dev_info(&h->pdev->dev, "NVRAM HBA flag: %s%s\n",
+               flag_enabled ? "enabled" : "disabled",
+               ignore ? " (ignored because of existing logical devices)" : "");
+
+       h->nvram_hba_mode_enabled = flag_enabled && !ignore;
 
        return 0;
 }
@@ -4442,7 +4446,7 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h)
                        __func__);
        }
 
-       if (hpsa_update_nvram_hba_mode(h)) {
+       if (hpsa_update_nvram_hba_mode(h, nlogicals)) {
                h->drv_req_rescan = 1;
                goto out;
        }
-- 
2.19.2