linux-kernel - Re: [PATCH] iommu/omap: Fix missing put_device() call in omap_iommu_probe

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Date:   Mon, 10 Jan 2022 12:43:57 -0600
From:   Suman Anna <s-anna@...com>
To:     Miaoqian Lin <linmq006@...il.com>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        "Nagalla, Hari" <hnagalla@...com>
Subject: Re: [PATCH] iommu/omap: Fix missing put_device() call in
 omap_iommu_probe_device

Hi Miaoqian,

On 1/9/22 8:43 PM, Miaoqian Lin wrote:
> Hi Suman Anna,
> On Fri, Jan 07, 2022 at 08:42:16AM -0600, Suman Anna wrote:
>> Hi Miaoqian,
>>
>>
>>> Add the corresponding 'put_device()' in the error handling paths.
>>
>> Also, need it in the regular path, not just in error handling path.
> I think after calling platform_get_drvdata() normally, the
> reference will be released in other functions, so don't need it in the
> regular path.
> 

No, it's a local reference and is acquired within omap_iommu_probe_device() and
needs to be released within this function. What other function are you referring
to here?

regards
Suman