linux-kernel - Re: [PATCH] i2c: bcm-iproc: Fix bcm_iproc_i2c

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Date:   Thu, 6 Jul 2023 21:36:14 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     YE Chengfeng <cyeaa@...nect.ust.hk>
Cc:     "andi.shyti@...nel.org" <andi.shyti@...nel.org>,
        "rjui@...adcom.com" <rjui@...adcom.com>,
        "sbranden@...adcom.com" <sbranden@...adcom.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bcm-kernel-feedback-list@...adcom.com" 
        <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH] i2c: bcm-iproc: Fix bcm_iproc_i2c_isr deadlock issue

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@...nect.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.


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