linux-kernel - Re: [PATCH] iommu/amd: Convert from atomic_t to refcount_t on device

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Message-ID: <bdb2f68a-fea9-ac69-d807-123e445b6465@amd.com>
Date:   Thu, 22 Jul 2021 14:33:11 -0500
From:   "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To:     Xiyu Yang <xiyuyang19@...an.edu.cn>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:     yuanxzhang@...an.edu.cn, Xin Tan <tanxin.ctf@...il.com>
Subject: Re: [PATCH] iommu/amd: Convert from atomic_t to refcount_t on
 device_state->count



On 7/19/2021 1:00 AM, Xiyu Yang wrote:
> refcount_t type and corresponding API can protect refcounters from
> accidental underflow and overflow and further use-after-free situations.
> 
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
> ---
>   drivers/iommu/amd/iommu_v2.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)

Thanks,

Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>