[PATCH 09/11] phy: renesas: phy-rcar-gen3-usb2: Fix devm action registration for disabled VBUS regulator

[Claudiu Beznea]

Hi, Biju,

On 6/15/26 15:42, Biju Das wrote:
> Hi Claudiu,
> 
> + stable <stable at kernel.org>
> 
>> -----Original Message-----
>> From: Claudiu Beznea <claudiu.beznea at tuxon.dev>
>> Sent: 15 June 2026 10:37
>> Subject: Re: [PATCH 09/11] phy: renesas: phy-rcar-gen3-usb2: Fix devm action registration for disabled
>> VBUS regulator
>>
>> Hi, Biju,
>>
>> On 6/12/26 17:30, Biju wrote:
>>> From: Biju Das <biju.das.jz at bp.renesas.com>
>>>
>>> devm_regulator_get_exclusive() initialises the regulator with
>>> enable_count = 1, requiring the consumer to disable it before release.
>>>
>>> Previously, the devm disable action was only registered when the
>>> regulator was explicitly enabled, causing the cleanup path to skip
>>> decrementing enable_count on device removal when the regulator was
>>> left disabled.
>>>
>>> Fix this by always registering the devm disable action when the
>>> regulator is enabled (checked via regulator_is_enabled()), covering
>>> both the explicitly-enabled case and the initial state set by
>>> devm_regulator_get_exclusive().
>>>
>>> This fixes WARN_ON enable count during regulator release.
>>>
>>> Fixes: 24843404efe4 ("phy: renesas: phy-rcar-gen3-usb2: Control VBUS
>>> for RZ/G2L SoCs")
>>> Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
>>
>> The approach in this patch don't solve the problem, at least on RZ/G3S. See [1] for logs.
>>
>> I applied this patch on next-20260610:
>>
>> git log --oneline -2
>> afe09f11d549 (HEAD) phy: renesas: phy-rcar-gen3-usb2: Fix devm action registration for disabled VBUS
>> regulator
>> abe651837cb3 (tag: next-20260610, linux-next/master) Add linux-next specific files for 20260610
>>
>> [1]
>> https://github.com/claudiubeznea/logs/blob/2f1bab20407dfe6031385819ffeabfc4eac772bd/logs
> 
> This issue is introduced by the commit
> 
> eb9ac779830b223584 ("usb: renesas_usbhs: Fix synchronous external abort on unbind")

Indeed, nice catch. I reverted this commit (just for checking the patch you 
proposed) and and now it looks good on RZ/G2L. Code from commit eb9ac779830b 
("usb: renesas_usbhs: Fix synchronous external abort on unbind") will have to be 
adjusted.

Thank you for investigation,
Claudiu