linux-kernel - Re: [PATCH] usb: gadget: udc: atmel: fix endpoint name

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Message-ID: <c90099af-2537-cc41-2775-dd2ca41dc070@atmel.com>
Date:   Fri, 16 Sep 2016 10:36:55 +0200
From:   Nicolas Ferre <nicolas.ferre@...el.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        Richard Genoud <richard.genoud@...il.com>
Subject: Re: [PATCH] usb: gadget: udc: atmel: fix endpoint name

Le 15/09/2016 à 17:07, Alexandre Belloni a écrit :
> Since commit c32b5bcfa3c4 ("ARM: dts: at91: Fix USB endpoint nodes"),
> atmel_usba_udc fails with:
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 0 at include/linux/usb/gadget.h:405
> ecm_do_notify+0x188/0x1a0
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper Not tainted 4.7.0+ #15
> Hardware name: Atmel SAMA5
> [<c010ccfc>] (unwind_backtrace) from [<c010a7ec>] (show_stack+0x10/0x14)
> [<c010a7ec>] (show_stack) from [<c0115c10>] (__warn+0xe4/0xfc)
> [<c0115c10>] (__warn) from [<c0115cd8>] (warn_slowpath_null+0x20/0x28)
> [<c0115cd8>] (warn_slowpath_null) from [<c04377ac>] (ecm_do_notify+0x188/0x1a0)
> [<c04377ac>] (ecm_do_notify) from [<c04379a4>] (ecm_set_alt+0x74/0x1ac)
> [<c04379a4>] (ecm_set_alt) from [<c042f74c>] (composite_setup+0xfc0/0x19f8)
> [<c042f74c>] (composite_setup) from [<c04356e8>] (usba_udc_irq+0x8f4/0xd9c)
> [<c04356e8>] (usba_udc_irq) from [<c013ec9c>] (handle_irq_event_percpu+0x9c/0x158)
> [<c013ec9c>] (handle_irq_event_percpu) from [<c013ed80>] (handle_irq_event+0x28/0x3c)
> [<c013ed80>] (handle_irq_event) from [<c01416d4>] (handle_fasteoi_irq+0xa0/0x168)
> [<c01416d4>] (handle_fasteoi_irq) from [<c013e3f8>] (generic_handle_irq+0x24/0x34)
> [<c013e3f8>] (generic_handle_irq) from [<c013e640>] (__handle_domain_irq+0x54/0xa8)
> [<c013e640>] (__handle_domain_irq) from [<c010b214>] (__irq_svc+0x54/0x70)
> [<c010b214>] (__irq_svc) from [<c0107eb0>] (arch_cpu_idle+0x38/0x3c)
> [<c0107eb0>] (arch_cpu_idle) from [<c0137300>] (cpu_startup_entry+0x9c/0xdc)
> [<c0137300>] (cpu_startup_entry) from [<c0900c40>] (start_kernel+0x354/0x360)
> [<c0900c40>] (start_kernel) from [<20008078>] (0x20008078)
> ---[ end trace e7cf9dcebf4815a6 ]---
> 
> Fixes: c32b5bcfa3c4 ("ARM: dts: at91: Fix USB endpoint nodes")
> Reported-by: Richard Genoud <richard.genoud@...il.com>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

Felipe, Greg,
It is clearly a regression and material for 4.8-fixes. But I do know
that we are very late in the process :-(
Please do what you can to make it progress before 4.8-final but I'm
truly aware of the challenge.

Thanks to Richard for finding this and Alexandre for the quick correction.

Bye,

> ---
>  drivers/usb/gadget/udc/atmel_usba_udc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
> index bb1f6c8f0f01..45bc997d0711 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
> @@ -1978,7 +1978,7 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>  			dev_err(&pdev->dev, "of_probe: name error(%d)\n", ret);
>  			goto err;
>  		}
> -		ep->ep.name = name;
> +		ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", ep->index);
>  
>  		ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
>  		ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
> 


-- 
Nicolas Ferre