On Thu, Aug 14, 2014 at 04:12:39PM +0200, Tomas Henzl wrote:
> When a second(kdump) kernel starts and the hard reset method is used
> the driver calls pci_disable_device without previously enabling it,
> so the kernel shows a warning -
> [ 16.876248] WARNING: at drivers/pci/pci.c:1431
> pci_disable_device+0x84/0x90()
> [ 16.882686] Device hpsa
> disabling already-disabled device
> ...
> This patch fixes it, in addition to this I tried to balance also some other
> pairs
> of enable/disable device in the driver.
> Unfortunately I wasn't able to verify the functionality for the case of a sw
> reset,
> because of a lack of proper hw.
>
> Changes in v2:
> - fixed a checkpatch issue
> - removed a no more valid comment
> - added pci_enable/disable pair when kdump kernel starts
> - fixed a typo in subject line
>
> Signed-off-by: Tomas Henzl <the...@redhat.com>
> ---
> drivers/scsi/hpsa.c | 42 ++++++++++++++++++++++++++++--------------
> 1 file changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 6b35d0d..cf793c3 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -5971,10 +5971,6 @@ static int hpsa_kdump_hard_reset_controller(struct
> pci_dev *pdev)
>
> /* Save the PCI command register */
> pci_read_config_word(pdev, 4, &command_register);
> - /* Turn the board off. This is so that later pci_restore_state()
> - * won't turn the board on before the rest of config space is ready.
> - */
> - pci_disable_device(pdev);
> pci_save_state(pdev);
>
> /* find the first memory BAR, so we can find the cfg table */
> @@ -6022,11 +6018,6 @@ static int hpsa_kdump_hard_reset_controller(struct
> pci_dev *pdev)
> goto unmap_cfgtable;
>
> pci_restore_state(pdev);
> - rc = pci_enable_device(pdev);
> - if (rc) {
> - dev_warn(&pdev->dev, "failed to enable device.\n");
> - goto unmap_cfgtable;
> - }
> pci_write_config_word(pdev, 4, command_register);
>
> /* Some devices (notably the HP Smart Array 5i Controller)
> @@ -6541,6 +6532,23 @@ static int hpsa_init_reset_devices(struct pci_dev
> *pdev)
> if (!reset_devices)
> return 0;
>
> + /* kdump kernel is loading, we don't know in which state is
> + * the pci interface. The dev->enable_cnt is equal zero
> + * so we call enable+disable, wait a while and switch it on.
> + */
> + rc = pci_enable_device(pdev);
> + if (rc) {
> + dev_warn(&pdev->dev, "Failed to enable PCI device\n");
> + return -ENODEV;
> + }
> + pci_disable_device(pdev);
> + msleep(260); /* a randomly chosen number */
> + rc = pci_enable_device(pdev);
> + if (rc) {
> + dev_warn(&pdev->dev, "failed to enable device.\n");
> + return -ENODEV;
> + }
> +
> /* Reset the controller with a PCI power-cycle or via doorbell */
> rc = hpsa_kdump_hard_reset_controller(pdev);
>
> @@ -6549,10 +6557,11 @@ static int hpsa_init_reset_devices(struct pci_dev
> *pdev)
> * "performant mode". Or, it might be 640x, which can't reset
> * due to concerns about shared bbwc between 6402/6404 pair.
> */
> - if (rc == -ENOTSUPP)
> - return rc; /* just try to do the kdump anyhow. */
> - if (rc)
> - return -ENODEV;
> + if (rc) {
> + if (rc != -ENOTSUPP) /* just try to do the kdump anyhow. */
> + rc = -ENODEV;
> + goto out_disable;
> + }
>
> /* Now try to get the controller to respond to a no-op */
> dev_warn(&pdev->dev, "Waiting for controller to respond to no-op\n");
> @@ -6563,7 +6572,11 @@ static int hpsa_init_reset_devices(struct pci_dev
> *pdev)
> dev_warn(&pdev->dev, "no-op failed%s\n",
> (i < 11 ? "; re-trying" : ""));
> }
> - return 0;
> +
> +out_disable:
> +
> + pci_disable_device(pdev);
> + return rc;
> }
>
> static int hpsa_allocate_cmd_pool(struct ctlr_info *h)
> @@ -6743,6 +6756,7 @@ static void
> hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
> iounmap(h->transtable);
> if (h->cfgtable)
> iounmap(h->cfgtable);
> + pci_disable_device(h->pdev);
> pci_release_regions(h->pdev);
> kfree(h);
> }
> --
> 1.8.3.1
Ack.
Reviewed-by: Stephen M. Cameron <scame...@beardog.cce.hp.com>
-- steve
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