From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752962AbdLDQpF (ORCPT <rfc822;w@1wt.eu>);
        Mon, 4 Dec 2017 11:45:05 -0500
Received: from mail-pf0-f196.google.com ([209.85.192.196]:42484 "EHLO
        mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752865AbdLDQo6 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 4 Dec 2017 11:44:58 -0500
X-Google-Smtp-Source: AGs4zMbYZbKzDsRtSEQLsxVcKGPDq5p0KJESNTrdTxJFugHaKrKpweQqRcv4yg5lmt5sCd7DVzOwVA==
Subject: Re: [PATCH 03/10] net: ezchip: nps_enet: Fix platform_get_irq's error
 checking
To: Russell King - ARM Linux <linux@armlinux.org.uk>,
        David Miller <davem@davemloft.net>
References: <1512242782-7134-4-git-send-email-arvind.yadav.cs@gmail.com>
 <20171204.112049.2189145622743900344.davem@davemloft.net>
 <20171204162447.GT10595@n2100.armlinux.org.uk>
 <20171204.113448.651799079717687661.davem@davemloft.net>
 <20171204164224.GU10595@n2100.armlinux.org.uk>
Cc: f.fainelli@gmail.com, netdev@vger.kernel.org, michal.simek@xilinx.com,
        linux-kernel@vger.kernel.org, opendmb@gmail.com, mkl@pengutronix.de,
        linux-arm-kernel@lists.infradead.org, Vladislav.Zakharov@synopsys.com,
        wg@grandegger.com
From: arvindY <arvind.yadav.cs@gmail.com>
Message-ID: <5A257B83.7000803@gmail.com>
Date: Mon, 4 Dec 2017 22:14:51 +0530
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.6.0
MIME-Version: 1.0
In-Reply-To: <20171204164224.GU10595@n2100.armlinux.org.uk>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org



On Monday 04 December 2017 10:12 PM, Russell King - ARM Linux wrote:
> On Mon, Dec 04, 2017 at 11:34:48AM -0500, David Miller wrote:
>> From: Russell King - ARM Linux <linux@armlinux.org.uk>
>> Date: Mon, 4 Dec 2017 16:24:47 +0000
>>
>>> On Mon, Dec 04, 2017 at 11:20:49AM -0500, David Miller wrote:
>>>> From: Arvind Yadav <arvind.yadav.cs@gmail.com>
>>>> Date: Sun,  3 Dec 2017 00:56:15 +0530
>>>>
>>>>> The platform_get_irq() function returns negative if an error occurs.
>>>>> zero or positive number on success. platform_get_irq() error checking
>>>>> for zero is not correct. And remove unnecessary check for free_netdev().
>>>>>
>>>>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
>>>>> ---
>>>>>   drivers/net/ethernet/ezchip/nps_enet.c | 7 +++----
>>>>>   1 file changed, 3 insertions(+), 4 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
>>>>> index 659f1ad..82dc6d0 100644
>>>>> --- a/drivers/net/ethernet/ezchip/nps_enet.c
>>>>> +++ b/drivers/net/ethernet/ezchip/nps_enet.c
>>>>> @@ -623,9 +623,9 @@ static s32 nps_enet_probe(struct platform_device *pdev)
>>>>>   
>>>>>   	/* Get IRQ number */
>>>>>   	priv->irq = platform_get_irq(pdev, 0);
>>>>> -	if (!priv->irq) {
>>>>> +	if (priv->irq <= 0) {
>>>>>   		dev_err(dev, "failed to retrieve <irq Rx-Tx> value from device tree\n");
>>>>> -		err = -ENODEV;
>>>>> +		err = priv->irq ? priv->irq : -ENODEV;
>>>> If platform_get_irq() returns "zero or positive number on success" then this
>>>> test is wrong and should be "if (priv->irq < 0)"
>>>>
>>>> Also, this series is a mix of different kinds of changes.
>>>>
>>>> Please separate out the platform IRQ error checking and just submit exactly
>>>> those changes as a patch series.
>>>>
>>>> The other bug fixes should be submitted outside of those changes since they
>>>> are unrelated.
>>> The issue of whether IRQ 0 is valid or not has been covered several times
>>> by Linus, and the result is that it is deemed by Linus that IRQ 0 is not
>>> a valid interrupt.
>> Then either platform_get_irq() as defined or this commit message (or both)
>> are wrong.
> Indeed, the commit message is wrong, and that's already been pointed out
> in previous patch sets.
>
I will change commit message.  Commit message will be
  " The platform_get_irq() function returns negative if an
error occurs, Zero if No irq found and positive number
on get irq successful. platform_get_irq() error checking for
only zero is not correct."