[PATCH 03/12] pm80xx : Free the tag when mpi_set_phy_profile_resp is received.

[Deepak Ukey <deepak.ukey@microchip.com>]

From: yuuzheng <yuuzheng@google.com>

In pm80xx driver, the command mpi_set_phy_profile_req is sent by host
during boot to configure the phy profile such as analog setting page,
rate control page. However, the tag is not freed when its response is
received. As a result, 16 tags are missing for each HBA after boot.
When NCQ is enabled with queue depth 16, it needs at least, 15 * 16 =
240 tags for each HBA to achieve the best performance. In current
pm80xx driver with setting CCB_MAX = 256, the total number of tags in
each HBA is 255 for data IO. Hence, without returning those tags to the
pool after boot, some device will finally be forced to non-ncq mode by
ATA layer due to excessive errors (i.e. LLDD cannot allocate tag for
queued task).

Signed-off-by: yuuzheng <yuuzheng@google.com>
Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Vishakha Channapattan <vishakhavc@google.com>
Signed-off-by: Bhavesh Jashnani <bjashnani@google.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Signed-off-by: Akshat Jain <akshatzen@google.com>
---
 drivers/scsi/pm8001/pm80xx_hwi.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index d805fd036ddf..37b82d7aa3d7 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -3715,28 +3715,32 @@ static int mpi_flash_op_ext_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
 static int mpi_set_phy_profile_resp(struct pm8001_hba_info *pm8001_ha,
 			void *piomb)
 {
+	u32 tag;
 	u8 page_code;
+	int rc = 0;
 	struct set_phy_profile_resp *pPayload =
 		(struct set_phy_profile_resp *)(piomb + 4);
 	u32 ppc_phyid = le32_to_cpu(pPayload->ppc_phyid);
 	u32 status = le32_to_cpu(pPayload->status);
 
+	tag = le32_to_cpu(pPayload->tag);
 	page_code = (u8)((ppc_phyid & 0xFF00) >> 8);
 	if (status) {
 		/* status is FAILED */
 		PM8001_FAIL_DBG(pm8001_ha,
 			pm8001_printk("PhyProfile command failed  with status "
 			"0x%08X \n", status));
-		return -1;
+		rc = -1;
 	} else {
 		if (page_code != SAS_PHY_ANALOG_SETTINGS_PAGE) {
 			PM8001_FAIL_DBG(pm8001_ha,
 				pm8001_printk("Invalid page code 0x%X\n",
 					page_code));
-			return -1;
+			rc = -1;
 		}
 	}
-	return 0;
+	pm8001_tag_free(pm8001_ha, tag);
+	return rc;
 }
 
 /**
-- 
2.16.3