From: santosh.shilimkar@oracle.com
To: Tony Lindgren <tony@atomide.com>
Cc: Dave Gerlach <d-gerlach@ti.com>,
Santosh Shilimkar <ssantosh@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
Suman Anna <s-anna@ti.com>
Subject: Re: [PATCH] soc: ti: wkup_m3_ipc: Fix race condition with rproc_boot
Date: Tue, 17 Dec 2019 10:32:14 -0800 [thread overview]
Message-ID: <05b9f0ff-bbc2-d8a7-3261-54c03a149db8@oracle.com> (raw)
In-Reply-To: <20191217182534.GD35479@atomide.com>
On 12/17/19 10:25 AM, Tony Lindgren wrote:
> Hi,
>
> * Dave Gerlach <d-gerlach@ti.com> [191211 20:02]:
>> Any user of wkup_m3_ipc calls wkup_m3_ipc_get to get a handle and this
>> checks the value of the static variable m3_ipc_state to see if the
>> wkup_m3 is ready. Currently this is populated during probe before
>> rproc_boot has been called, meaning there is a window of time that
>> wkup_m3_ipc_get can return a valid handle but the wkup_m3 itself is not
>> ready, leading to invalid IPC calls to the wkup_m3 and system
>> instability.
>>
>> To avoid this, move the population of the m3_ipc_state variable until
>> after rproc_boot has succeeded to guarantee a valid and usable handle
>> is always returned.
>
> Santosh, do you want me to pick this one into my fixes branch?
>
Sure, go ahead.
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
next prev parent reply other threads:[~2019-12-17 18:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-12 4:03 Dave Gerlach
2019-12-17 18:25 ` Tony Lindgren
2019-12-17 18:32 ` santosh.shilimkar [this message]
2019-12-17 18:35 ` Tony Lindgren
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