Re: [PATCH] pinctrl: Initialize pinctrl_dev.node

[Jon Hunter <jonathanh@xxxxxxxxxx>]

On 12/01/17 16:03, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
> 
> The struct pinctrl_dev's node field is not properly set up, which means
> the .prev and .next fields will be NULL. That's not something that the
> linked list code can deal with, so extra care must be taken when using
> these fields. An example of this is introduced in commit 3429fb3cda34
> ("pinctrl: Fix panic when pinctrl devices with hogs are unregistered")
> where list_del() is made conditional on the pinctrl device being part
> of the pinctrl device list. This is to ensure that list_del() won't
> crash upon encountering a NULL pointer in .prev and/or .next.
> 
> After initializing the list head there's no need to jump through these
> extra hoops and list_del() will work unconditionally. This is because
> the initialized list head points to itself and therefore the .prev and
> .next fields can be properly dereferenced.
> 
> Cc: Jonathan Hunter <jonathanh@xxxxxxxxxx>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>

Thanks for catching this.

Acked-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>

Cheers
Jon

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