linux-kernel - RE: [PATCH V15 4/6] i2c: tegra: Add DMA support

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Message-ID: <BYAPR12MB339863A43F030013DCA7F548C2690@BYAPR12MB3398.namprd12.prod.outlook.com>
Date:   Fri, 8 Feb 2019 15:58:13 +0000
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mantravadi Karthik <mkarthik@...dia.com>,
        Shardar Mohammed <smohammed@...dia.com>,
        Timo Alho <talho@...dia.com>
CC:     "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: RE: [PATCH V15 4/6] i2c: tegra: Add DMA support



> > Please use "release_dma:" variant that I suggested in the comment to v14 because:
> > >
> > 1) It's just a good (and common-style in kernel) tone to unwind errors handling in the opposite order, it makes code more straight forward and helps to avoid silly mistakes.
> >
> > 2) It keeps the current code consistent in regards to probe error-handling.
> >
>
> Can move tegra_i2c_release_dma under the same disable_div_clk label before clk_disable
>
> Order in probe is
	clk_prepare
	i2c_runtime_resume
	clk_enable in case of multimaster mode
	i2c_init_dma
>
> unwinding should be order is
	release_dma
	disable_div_clk
	disable_rpm
	unprepared
>
> Probe failure from tegra_i2c_init_dma, tegra_i2c_init, devm_request_irq, i2c_add_numbered_adapter all of them perform goto disable_div_clk
>
> I can add tegra_i2c_release_dma before performing clock disable under same disable_div_clk so all existing disable_div_clk labels remain same.
> Otherwise adding new label release_dma causes all goto disable_div_clk statement also to be changed but its same as adding release_dma under disable_div_clk above the clk_disable.
>

OK, please ignore above. will add release_dma to show explicitly for readability.
With release_dma all error handlers performing disable_clk_div need to go thru release dma and disable_clk_div label is not needed.
So having release dma under disable_clk before clk_disable function is also same. 

Please confirm if this is ok to use same disable_div_clk or do you prefer release_dma label removing disable_div_clk


> > >  
> > >  disable_rpm:
> > >  	pm_runtime_disable(&pdev->dev);
> >
> >
> > [snip]
> >
> > Please also address my comment to the "fix maximum transfer size" patch. And please add Wolfram Sang to the CC list.
> >
> > Looks like v16 should be the final, so with everything being addressed:
> >
> > Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> > Tested-by: Dmitry Osipenko <digetx@...il.com>