[PATCH 17/43] hpsa: clean up error handling

Don Brace
2015-02-21T22:20:22Z

From: Robert Elliott <elliott@hp.com>

refactor error cleanup and shutdown
disable interrupts and pci_disable_device on critical failures
add hpsa_free_cfgtables function

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Reviewed-by: Kevin Barnett <kevin.barnett@pmcs.com>
Signed-off-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
---
drivers/scsi/hpsa.c | 92 ++++++++++++++++++++++++++++++++-------------------
1 file changed, 58 insertions(+), 34 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 94146c6..21e3610 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6560,6 +6560,17 @@ static int hpsa_find_cfg_addrs(struct pci_dev *pdev, void __iomem *vaddr,
return 0;
}

+static void hpsa_free_cfgtables(struct ctlr_info *h)
+{
+ if (h->transtable)
+ iounmap(h->transtable);
+ if (h->cfgtable)
+ iounmap(h->cfgtable);
+}
+
+/* Find and map CISS config table and transfer table
++ * several items must be unmapped (freed) later
++ * */
static int hpsa_find_cfgtables(struct ctlr_info *h)
{
u64 cfg_offset;
@@ -6586,8 +6597,11 @@ static int hpsa_find_cfgtables(struct ctlr_info *h)
h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
cfg_base_addr_index)+cfg_offset+trans_offset,
sizeof(*h->transtable));
- if (!h->transtable)
+ if (!h->transtable) {
+ dev_err(&h->pdev->dev, "Failed mapping transfer table\n");
+ hpsa_free_cfgtables(h);
return -ENOMEM;
+ }
return 0;
}

@@ -6763,6 +6777,17 @@ error:
return -ENODEV;
}

+/* free items allocated or mapped by hpsa_pci_init */
+static void hpsa_free_pci_init(struct ctlr_info *h)
+{
+ hpsa_free_cfgtables(h); /* pci_init 4 */
+ iounmap(h->vaddr); /* pci_init 3 */
+ hpsa_disable_interrupt_mode(h); /* pci_init 2 */
+ pci_release_regions(h->pdev); /* pci_init 2 */
+ pci_disable_device(h->pdev); /* pci_init 1 */
+}
+
+/* several items must be freed later */
static int hpsa_pci_init(struct ctlr_info *h)
{
int prod_index, err;
@@ -6781,15 +6806,15 @@ static int hpsa_pci_init(struct ctlr_info *h)

err = pci_enable_device(h->pdev);
if (err) {
- dev_warn(&h->pdev->dev, "unable to enable PCI device\n");
+ dev_err(&h->pdev->dev, "failed to enable PCI device\n");
return err;
}

err = pci_request_regions(h->pdev, HPSA);
if (err) {
dev_err(&h->pdev->dev,
- "cannot obtain PCI resources, aborting\n");
- return err;
+ "failed to obtain PCI resources\n");
+ goto clean1; /* pci */
}

pci_set_master(h->pdev);
@@ -6797,40 +6822,41 @@ static int hpsa_pci_init(struct ctlr_info *h)
hpsa_interrupt_mode(h);
err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr);
if (err)
- goto err_out_free_res;
+ goto clean2; /* intmode+region, pci */
h->vaddr = remap_pci_mem(h->paddr, 0x250);
if (!h->vaddr) {
+ dev_err(&h->pdev->dev, "failed to remap PCI mem\n");
err = -ENOMEM;
- goto err_out_free_res;
+ goto clean2; /* intmode+region, pci */
}
err = hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY);
if (err)
- goto err_out_free_res;
+ goto clean3; /* vaddr, intmode+region, pci */
err = hpsa_find_cfgtables(h);
if (err)
- goto err_out_free_res;
+ goto clean3; /* vaddr, intmode+region, pci */
hpsa_find_board_params(h);

if (!hpsa_CISS_signature_present(h)) {
err = -ENODEV;
- goto err_out_free_res;
+ goto clean4; /* cfgtables, vaddr, intmode+region, pci */
}
hpsa_set_driver_support_bits(h);
hpsa_p600_dma_prefetch_quirk(h);
err = hpsa_enter_simple_mode(h);
if (err)
- goto err_out_free_res;
+ goto clean4; /* cfgtables, vaddr, intmode+region, pci */
return 0;

-err_out_free_res:
- if (h->transtable)
- iounmap(h->transtable);
- if (h->cfgtable)
- iounmap(h->cfgtable);
- if (h->vaddr)
- iounmap(h->vaddr);
- pci_disable_device(h->pdev);
+clean4: /* cfgtables, vaddr, intmode+region, pci */
+ hpsa_free_cfgtables(h);
+clean3: /* vaddr, intmode+region, pci */
+ iounmap(h->vaddr);
+clean2: /* intmode+region, pci */
+ hpsa_disable_interrupt_mode(h);
pci_release_regions(h->pdev);
+clean1: /* pci */
+ pci_disable_device(h->pdev);
return err;
}

@@ -7039,8 +7065,9 @@ static int hpsa_request_irqs(struct ctlr_info *h,
}
}
if (rc) {
- dev_err(&h->pdev->dev, "unable to get irq %d for %s\n",
+ dev_err(&h->pdev->dev, "failed to get irq %d for %s\n",
h->intr[h->intr_mode], h->devname);
+ hpsa_free_irqs(h);
return -ENODEV;
}
return 0;
@@ -7092,15 +7119,11 @@ static void hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
kfree(h->ioaccel1_blockFetchTable);
kfree(h->blockFetchTable);
hpsa_free_reply_queues(h);
- if (h->vaddr)
- iounmap(h->vaddr);
- if (h->transtable)
- iounmap(h->transtable);
- if (h->cfgtable)
- iounmap(h->cfgtable);
- hpsa_disable_interrupt_mode(h);
+ hpsa_free_cfgtables(h); /* pci_init 4 */
+ iounmap(h->vaddr); /* pci_init 3 */
+ hpsa_disable_interrupt_mode(h); /* pci_init 2 */
pci_disable_device(h->pdev);
- pci_release_regions(h->pdev);
+ pci_release_regions(h->pdev); /* pci_init 2 */
kfree(h);
}

@@ -7418,7 +7441,7 @@ reinit_after_soft_reset:
dac = 0;
} else {
dev_err(&pdev->dev, "no suitable DMA available\n");
- goto clean1;
+ goto clean2;
}
}

@@ -7528,6 +7551,7 @@ clean4:
clean2_and_free_irqs:
hpsa_free_irqs(h);
clean2:
+ hpsa_free_pci_init(h);
clean1:
if (h->resubmit_wq)
destroy_workqueue(h->resubmit_wq);
@@ -7619,12 +7643,10 @@ static void hpsa_remove_one(struct pci_dev *pdev)
destroy_workqueue(h->resubmit_wq);
hpsa_unregister_scsi(h); /* unhook from SCSI subsystem */

- /* includes hpsa_free_irqs and hpsa_disable_interrupt_mode */
+ /* includes hpsa_free_irqs */
+ /* includes hpsa_disable_interrupt_mode - pci_init 2 */
hpsa_shutdown(pdev);

- iounmap(h->vaddr);
- iounmap(h->transtable);
- iounmap(h->cfgtable);
hpsa_free_device_info(h);
hpsa_free_sg_chain_blocks(h);
pci_free_consistent(h->pdev,
@@ -7639,8 +7661,10 @@ static void hpsa_remove_one(struct pci_dev *pdev)
kfree(h->ioaccel1_blockFetchTable);
kfree(h->ioaccel2_blockFetchTable);
kfree(h->hba_inquiry_data);
- pci_disable_device(pdev);
- pci_release_regions(pdev);
+
+ /* includes hpsa_disable_interrupt_mode - pci_init 2 */
+ hpsa_free_pci_init(h);
+
free_percpu(h->lockup_detected);
kfree(h);
}