On Tuesday, June 17, 2014 03:07:55 PM Mikko Perttunen wrote:
> ahci_platform_get_resources handles resource management for
> platform AHCI drivers, including getting a possible PHY
> from the device tree. Since not all drivers need a PHY, it
> ignores -ENODEV and -ENOSYS from devm_get_phy. However, when
> the PHY subsystem is mistakenly disabled, -ENOSYS can be
> returned even when a PHY is needed.
>
> This patch modifies the -ENOSYS case to check if a "phys"
> device tree node exists. If it exists, then clearly the PHY
> subsystem is mistakenly disabled and the driver cannot work,
> ahci_platform_get_resources will fail and propagate the error.
>
> Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> ---
> drivers/ata/libahci_platform.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 3a5b4ed..b007758 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -250,8 +250,13 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
> if (IS_ERR(hpriv->phy)) {
> rc = PTR_ERR(hpriv->phy);
> switch (rc) {
> - case -ENODEV:
> case -ENOSYS:
> + /* No PHY support. Check if PHY is required. */
> + if (of_find_property(dev->of_node, "phys", NULL)) {
> + dev_err(dev, "couldn't get sata-phy: ENOSYS\n");
> + goto err_out;
> + }
> + case -ENODEV:
> /* continue normally */
> hpriv->phy = NULL;
> break;
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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