linux-kernel - Re: [PATCH] usb: host: iounmap before return

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Message-ID: <566551CE.10604@linux.intel.com>
Date:	Mon, 7 Dec 2015 17:30:54 +0800
From:	Lu Baolu <baolu.lu@...ux.intel.com>
To:	"Geyslan G. Bem" <geyslan@...il.com>, peter.senna@...il.com
Cc:	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: host: iounmap before return



On 12/06/2015 09:47 PM, Geyslan G. Bem wrote:
> This patch fixes a 'quirk_usb_handoff_xhci()' branch return that was not unmapping correctly.
>
> Coccinelle: scripts/coccinelle/free/iounmap.cocci
>
> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
> ---
>  drivers/usb/host/pci-quirks.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index f940056..64150dd 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -990,7 +990,7 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
>  			/* We're reading garbage from the controller */
>  			dev_warn(&pdev->dev,
>  				 "xHCI controller failing to respond");
> -			return;
> +			goto out;

If "out" is only used here, why not iounmap and return directly here?

>  		}
>  
>  		if (!ext_cap_offset)
> @@ -1062,6 +1062,7 @@ hc_init:
>  			 XHCI_MAX_HALT_USEC, val);
>  	}
>  
> +out:
>  	iounmap(base);
>  }
>  

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