linux-kernel - RE: [PATCH] usb: host: fsl-mph-dr-of: check return of dma_set

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Message-ID: <AM6PR04MB541398FE3D01D0759D9D98EBF1050@AM6PR04MB5413.eurprd04.prod.outlook.com>
Date:   Wed, 14 Oct 2020 07:49:17 +0000
From:   Ran Wang <ran.wang_1@....com>
To:     Peter Chen <peter.chen@....com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jun Li <jun.li@....com>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: host: fsl-mph-dr-of: check return of dma_set_mask()

Hi Peter,

On Sunday, October 11, 2020 7:41 AM Peter Chen wrote:
> 
> On 20-10-10 14:03:08, Ran Wang wrote:
> > fsl_usb2_device_register() should stop init if dma_set_mask() return
> > error.
> >
> > Fixes: cae058610465 ("drivers/usb/host: fsl: Set DMA_MASK of usb
> > platform device")
> > Signed-off-by: Ran Wang <ran.wang_1@....com>
> > ---
> >  drivers/usb/host/fsl-mph-dr-of.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/host/fsl-mph-dr-of.c
> > b/drivers/usb/host/fsl-mph-dr-of.c
> > index ae8f60f..44a7e58 100644
> > --- a/drivers/usb/host/fsl-mph-dr-of.c
> > +++ b/drivers/usb/host/fsl-mph-dr-of.c
> > @@ -94,10 +94,13 @@ static struct platform_device
> > *fsl_usb2_device_register(
> >
> >  	pdev->dev.coherent_dma_mask = ofdev->dev.coherent_dma_mask;
> >
> > -	if (!pdev->dev.dma_mask)
> > +	if (!pdev->dev.dma_mask) {
> >  		pdev->dev.dma_mask = &ofdev->dev.coherent_dma_mask;
> > -	else
> > -		dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
> > +	} else {
> > +		retval = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
> > +		if (retval)
> > +			goto error;
> > +	}
> >
> >  	retval = platform_device_add_data(pdev, pdata, sizeof(*pdata));
> >  	if (retval)
> > --
> > 2.7.4
> >
> 
> Reviewed-by: Peter Chen <peter.chen@....com>
> 
> One more place need to fix, if platform_device_alloc returns NULL,
> it should not call platform_device_put to release platform
> device memory.
> 
> 	pdev = platform_device_alloc(name, id);
> 	if (!pdev) {
> 		retval = -ENOMEM;
> 		goto error;
> 	}
> 	...
> error:
> 	platform_device_put(pdev);
> 	return ERR_PTR(retval);

Got it, let me check this later.

Thanks & Regards,
Ran