linux-kernel - Re: [PATCH v1 1/1] usb: dwc3: gadget: Revert "set gadgets parent to the right controller"

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Date:   Tue, 5 Oct 2021 10:51:00 +0200
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     Ferry Toth <fntoth@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>
Subject: Re: [PATCH v1 1/1] usb: dwc3: gadget: Revert "set gadgets parent to
 the right controller"

On Mon, Oct 04, 2021 at 10:35:57PM +0200, Ferry Toth wrote:
>Hi,
>
>Op 04-10-2021 om 16:18 schreef Andy Shevchenko:
>>The commit c6e23b89a95d ("usb: dwc3: gadget: set gadgets parent to the right
>>controller") changed the device for the UDC and broke the user space scripts
>>that instantiate the USB gadget(s) via ConfigFS.
>
>I confirm this regression on Intel Edison since at least 5.15-rc2 
>while in 5.14.0 it was working fine.
>
>This patch resolves the issue as tested on 5.15-rc4.
>
>Tested-by: Ferry Toth<fntoth@...il.com>

NACK! Why should we resolv an issue by reverting it to solve not working
userspace. We already have this patch as a solution for solving a deeper
Problem, regarding the allocator addressing the right device.

>>Revert it for now until the better solution will be proposed.

So, I think fixing the userspace would be the right fix, not changing
the kernel. Otherwise we should find a proper solution.

>>
>>Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>---
>>  drivers/usb/dwc3/gadget.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>>diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>>index 8e66a70adae6..13664609ed3c 100644
>>--- a/drivers/usb/dwc3/gadget.c
>>+++ b/drivers/usb/dwc3/gadget.c
>>@@ -4253,7 +4253,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>>  	}
>>-	usb_initialize_gadget(dwc->sysdev, dwc->gadget, dwc_gadget_release);
>>+	usb_initialize_gadget(dwc->dev, dwc->gadget, dwc_gadget_release);
>>  	dev				= &dwc->gadget->dev;
>>  	dev->platform_data		= dwc;
>>  	dwc->gadget->ops		= &dwc3_gadget_ops;
>

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