[PATCH V2 04/13] pm80xx : Cleanup initialization loading fail path.

Deepak Ukey
2020-01-17T07:10:37Z

From: Peter Chang <dpf@google.com>

1)Move the instance tracking down after we think the instance is
good to go. avoids having a use-after free.
2)There are goto targets for trying to cleanup if the hw fails to
initialize, but there's some overlap depending on who thinks they
own the sub-structures.

Signed-off-by: Peter Chang <dpf@google.com>
Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
drivers/scsi/pm8001/pm8001_init.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index a002eb5a3fe4..775517f9b39d 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -1016,6 +1016,7 @@ static int pm8001_pci_probe(struct pci_dev *pdev,
struct pm8001_hba_info *pm8001_ha;
struct Scsi_Host *shost = NULL;
const struct pm8001_chip_info *chip;
+ struct sas_ha_struct *sha;

dev_printk(KERN_INFO, &pdev->dev,
"pm80xx: driver version %s\n", DRV_VERSION);
@@ -1044,12 +1045,12 @@ static int pm8001_pci_probe(struct pci_dev *pdev,
goto err_out_regions;
}
chip = &pm8001_chips[ent->driver_data];
- SHOST_TO_SAS_HA(shost) =
- kzalloc(sizeof(struct sas_ha_struct), GFP_KERNEL);
- if (!SHOST_TO_SAS_HA(shost)) {
+ sha = kzalloc(sizeof(struct sas_ha_struct), GFP_KERNEL);
+ if (!sha) {
rc = -ENOMEM;
goto err_out_free_host;
}
+ SHOST_TO_SAS_HA(shost) = sha;

rc = pm8001_prep_sas_ha_init(shost, chip);
if (rc) {
@@ -1070,7 +1071,7 @@ static int pm8001_pci_probe(struct pci_dev *pdev,
"pm8001_setup_irq failed [ret: %d]\n", rc));
goto err_out_shost;
}
- list_add_tail(&pm8001_ha->list, &hba_list);
+
PM8001_CHIP_DISP->chip_soft_rst(pm8001_ha);
rc = PM8001_CHIP_DISP->chip_init(pm8001_ha);
if (rc) {
@@ -1105,8 +1106,12 @@ static int pm8001_pci_probe(struct pci_dev *pdev,

pm8001_post_sas_ha_init(shost, chip);
rc = sas_register_ha(SHOST_TO_SAS_HA(shost));
- if (rc)
+ if (rc) {
+ PM8001_FAIL_DBG(pm8001_ha, pm8001_printk(
+ "sas_register_ha failed [ret: %d]\n", rc));
goto err_out_shost;
+ }
+ list_add_tail(&pm8001_ha->list, &hba_list);
scsi_scan_host(pm8001_ha->shost);
pm8001_ha->flags = PM8001F_RUN_TIME;
return 0;
@@ -1116,7 +1121,7 @@ static int pm8001_pci_probe(struct pci_dev *pdev,
err_out_ha_free:
pm8001_free(pm8001_ha);
err_out_free:
- kfree(SHOST_TO_SAS_HA(shost));
+ kfree(sha);
err_out_free_host:
scsi_host_put(shost);
err_out_regions:
--
2.16.3