netdev - Re: [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw/cpts: Fix CPTS release action

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Message-ID: <Y8fYNTXpkRkoLmnM@unreal>
Date:   Wed, 18 Jan 2023 13:29:57 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Siddharth Vadapalli <s-vadapalli@...com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        linux@...linux.org.uk, pabeni@...hat.com, rogerq@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, vigneshr@...com, srk@...com
Subject: Re: [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw/cpts: Fix
 CPTS release action

On Wed, Jan 18, 2023 at 03:24:39PM +0530, 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>
> ---
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c |  2 ++
>  drivers/net/ethernet/ti/am65-cpts.c      | 15 +++++----------
>  drivers/net/ethernet/ti/am65-cpts.h      |  5 +++++
>  3 files changed, 12 insertions(+), 10 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>