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Message-ID: <82362ecb-2049-14f4-f176-36bfcbbf84ad@broadcom.com>
Date:   Thu, 6 Jul 2023 13:08:38 -0700
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Subject: Re: [PATCH] i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue
To:     Wolfram Sang <wsa@kernel.org>, YE Chengfeng <cyeaa@connect.ust.hk>,
        "andi.shyti@kernel.org" <andi.shyti@kernel.org>,
        "rjui@broadcom.com" <rjui@broadcom.com>,
        "sbranden@broadcom.com" <sbranden@broadcom.com>,
        "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "bcm-kernel-feedback-list@broadcom.com" 
        <bcm-kernel-feedback-list@broadcom.com>
References: <TYCP286MB1188708B1CE64D95FBACF9E78A20A@TYCP286MB1188.JPNP286.PROD.OUTLOOK.COM>
 <ZKcXrt3vGzncO/0d@shikoro>
From:   Ray Jui <ray.jui@broadcom.com>
In-Reply-To: <ZKcXrt3vGzncO/0d@shikoro>
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Hi Wolfram,

On 7/6/2023 12:36 PM, Wolfram Sang wrote:
> On Sat, Jun 24, 2023 at 07:36:02PM +0000, YE Chengfeng wrote:
>> iproc_i2c_rd_reg and iproc_i2c_wr_reg are called from both
>> interrupt context (e.g. bcm_iproc_i2c_isr) and process context
>> (e.g. bcm_iproc_i2c_suspend). Therefore, interrupts should be
>> disabled to avoid potential deadlock. To prevent this deadlock,
>> use spin_lock_irqsave.
>>
>> Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk>
> 
> I can't apply it, what version is this against? Also, if someone could
> supply a proper Fixes-tag, this would be much appreciated.
> 

I'll let Chengfeng check the version.

For the fixes tag, it is:
Fixes: 9a1038728037 ("i2c: iproc: add NIC I2C support")

Thanks,

Ray

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