On 04/25/2012 05:07 AM, Hiroshi DOYU wrote:
> Add extern func, "tegra_ahb_enable_smmu()" to inform AHB that SMMU is
> ready.
> +#ifdef CONFIG_ARCH_TEGRA_3x_SOC
> +static int __tegra_ahb_enable_smmu(struct device *dev, void *data)
...
> +int tegra_ahb_enable_smmu(void)
> +{
> + return driver_for_each_device(&tegra_ahb_driver.driver, NULL, NULL,
> + __tegra_ahb_enable_smmu);
> +}
> +EXPORT_SYMBOL(tegra_ahb_enable_smmu);
> +#endif
That looks like a neat solution to avoid having a global device object.
However, if that driver_for_each_device finds no devices, the function
still succeeds. That doesn't seem right, and doesn't allow e.g. the SMMU
to defer its probe until the AHB driver has completed.
Perhaps add a local int variable to tegra_ahb_enable_smmu(), pass the
address to __tegra_ahb_enable_smmu, and have it increment the int. Then,
after calling driver_for_each_device,:
if (!ahb_device_count)
return -EPROBE_DEFER
if (WARN_ON(ahb_device_count != 1))
return -EINVAL;
return 0;
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
