linux-kernel - Re: [PATCH v2] Revert "usb: host: ehci-msm: Use devm_ioremap_resource instead of devm

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Message-ID: <Pine.LNX.4.44L0.1504271044210.1362-100000@iolanthe.rowland.org>
Date:	Mon, 27 Apr 2015 10:44:43 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>,
	Vivek Gautam <gautam.vivek@...sung.com>
Subject: Re: [PATCH v2] Revert "usb: host: ehci-msm: Use devm_ioremap_resource
 instead of devm_ioremap"

On Mon, 27 Apr 2015, Ivan T. Ivanov wrote:

> This reverts commit 70843f623b58 ("usb: host: ehci-msm: Use
> devm_ioremap_resource instead of devm_ioremap") and commit
> e507bf577e5a ("host: ehci-msm: remove duplicate check on resource"),
> because msm_otg and this driver are using same address space to
> access AHB mode and USB command registers.
> 
> Cc: Vivek Gautam <gautam.vivek@...sung.com>
> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> ---
> 
> Changes since v0:
> 
> * Add note to patch description that also commit e507bf577e5a is reverted.
> 
>  drivers/usb/host/ehci-msm.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
> index 9db74ca..275c92e 100644
> --- a/drivers/usb/host/ehci-msm.c
> +++ b/drivers/usb/host/ehci-msm.c
> @@ -88,13 +88,20 @@ static int ehci_msm_probe(struct platform_device *pdev)
>  	}
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
> -	if (IS_ERR(hcd->regs)) {
> -		ret = PTR_ERR(hcd->regs);
> +	if (!res) {
> +		dev_err(&pdev->dev, "Unable to get memory resource\n");
> +		ret = -ENODEV;
>  		goto put_hcd;
>  	}
> +
>  	hcd->rsrc_start = res->start;
>  	hcd->rsrc_len = resource_size(res);
> +	hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
> +	if (!hcd->regs) {
> +		dev_err(&pdev->dev, "ioremap failed\n");
> +		ret = -ENOMEM;
> +		goto put_hcd;
> +	}
> 
>  	/*
>  	 * OTG driver takes care of PHY initialization, clock management,
> --
> 1.9.1

Acked-by: Alan Stern <stern@...land.harvard.edu>

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