[PATCH v2] ARM: Add sanity check for dev->periphid in amba_probe()

[Russell King (Oracle)]

On Tue, Aug 30, 2022 at 10:47:31AM +0100, Russell King (Oracle) wrote:
> How can we get to amba_probe() if amba_match() has not returned a
> positive match for an ID? Surely if that happens, the driver model
> is failed - since a probe function should not be called unless the
> driver matches the device.
> 
> This patch, and 9229/1 both feel like they're working around some
> brokenness elsewhere in the kernel.
> 
> The description in 9229/1, specifically "But not all drivers have .match

Sorry, meant 9238/1.

> hook, such as pl031, the dev->bus->probe will be called directly in
> __driver_attach()." AMBA drivers do not have a .match hook - the bus
> does, which all AMBA drivers must be a member of. If amba_match fails,
> there is no way that amba_probe() should ever be called.

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