linux-kernel - Re: [PATCH v1 1/6] usb: gadget: pch_udc: Drop unneeded cpu_to

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Date:   Tue, 23 Mar 2021 12:58:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v1 1/6] usb: gadget: pch_udc: Drop unneeded cpu_to_le32()
 call

On Mon, Mar 22, 2021 at 11:11:44PM +0200, Andy Shevchenko wrote:
> Either way ~0 will be in the correct byte order,
> hence drop unneeded cpu_to_le32() call. Moreover,
> it makes sparse happy, otherwise it complains:
> 
> pch_udc.c:1813:27: warning: incorrect type in assignment (different base types)
> pch_udc.c:1813:27:    expected unsigned int [usertype] dataptr
> pch_udc.c:1813:27:    got restricted __le32 [usertype]
> 
> Fixes: f646cf94520e ("USB device driver of Topcliff PCH")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/usb/gadget/udc/pch_udc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
> index a3c1fc924268..2e2dca391007 100644
> --- a/drivers/usb/gadget/udc/pch_udc.c
> +++ b/drivers/usb/gadget/udc/pch_udc.c
> @@ -1756,7 +1756,7 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
>  	}
>  	/* prevent from using desc. - set HOST BUSY */
>  	dma_desc->status |= PCH_UDC_BS_HST_BSY;
> -	dma_desc->dataptr = cpu_to_le32(DMA_ADDR_INVALID);
> +	dma_desc->dataptr = DMA_ADDR_INVALID;
>  	req->td_data = dma_desc;
>  	req->td_data_last = dma_desc;
>  	req->chain_len = 1;

With this series applied, I get the following build warning:

drivers/usb/gadget/udc/pch_udc.c: In function ‘pch_udc_alloc_request’:
drivers/usb/gadget/udc/pch_udc.c:208:26: warning: conversion from ‘long long unsigned int’ to ‘u32’ {aka ‘unsigned int’} changes value from ‘18446744073709551615’ to ‘4294967295’ [-Woverflow]
  208 | #define DMA_ADDR_INVALID (~(dma_addr_t)0)
      |                          ^
drivers/usb/gadget/udc/pch_udc.c:1813:22: note: in expansion of macro ‘DMA_ADDR_INVALID’
 1813 |  dma_desc->dataptr = DMA_ADDR_INVALID;
      |                      ^~~~~~~~~~~~~~~~


Please fix up and resend a new version of this series.

thanks,

greg k-h