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

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Date:	Tue, 28 Apr 2015 13:00:30 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2] Revert
 "usb: host: ehci-msm: Use devm_ioremap_resource instead of devm_ioremap"

Hi,

--------------------------------------------------
From: "Alan Stern" <stern@...land.harvard.edu>
Sent: Monday, April 27, 2015 8:14 PM
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.

Ok,

Acked-by: Vivek Gautam <gautam.vivek@...sung.com>

>>
>>  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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