linux-kernel - Re: [PATCH net-next] net: ethernet: ti: am65-cpsw/cpts: Fix CPTS release action

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Date:   Fri, 13 Jan 2023 16:25:20 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Siddharth Vadapalli <s-vadapalli@...com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, linux@...linux.org.uk,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, vigneshr@...com, srk@...com
Subject: Re: [PATCH net-next] net: ethernet: ti: am65-cpsw/cpts: Fix CPTS
 release action



On 13/01/2023 12:48, Siddharth Vadapalli wrote:
> The am65_cpts_release() function is registered as a devm_action in the
> am65_cpts_create() function in am65-cpts driver. When the am65-cpsw driver
> invokes am65_cpts_create(), am65_cpts_release() is added in the set of devm
> actions associated with the am65-cpsw driver's device.
> 
> In the event of probe failure or probe deferral, the platform_drv_probe()
> function invokes dev_pm_domain_detach() which powers off the CPSW and the
> CPSW's CPTS hardware, both of which share the same power domain. Since the
> am65_cpts_disable() function invoked by the am65_cpts_release() function
> attempts to reset the CPTS hardware by writing to its registers, the CPTS
> hardware is assumed to be powered on at this point. However, the hardware
> is powered off before the devm actions are executed.
> 
> Fix this by getting rid of the devm action for am65_cpts_release() and
> invoking it directly on the cleanup and exit paths.
> 
> Fixes: f6bd59526ca5 ("net: ethernet: ti: introduce am654 common platform time sync driver")
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>

Reviewed-by: Roger Quadros <rogerq@...nel.org>

cheers,
-roger