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Message-ID: <20160106173454.2e1b5241@xhacker>
Date: Wed, 6 Jan 2016 17:34:54 +0800
From: Jisheng Zhang <jszhang@...vell.com>
To: Ludovic Desroches <ludovic.desroches@...el.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <ulf.hansson@...aro.org>,
<linux-kernel@...r.kernel.org>, <kernel@...inux.com>,
<arnd@...db.de>, <swarren@...dotorg.org>,
<srinivas.kandagatla@...il.com>, <lee@...nel.org>,
<linux-mmc@...r.kernel.org>, <michal.simek@...inx.com>,
<patrice.chotard@...com>, <eric@...olt.net>,
<thierry.reding@...il.com>, <linux-rpi-kernel@...ts.infradead.org>,
<linux-tegra@...r.kernel.org>, <sebastian.hesselbarth@...il.com>,
<soren.brinkmann@...inx.com>, <maxime.coquelin@...com>
Subject: Re: [PATCH v2 06/12] mmc: sdhci-of-at91: use sdhci_pltfm_init for
private allocation
Dear Ulf,
On Wed, 6 Jan 2016 17:22:48 +0800 Jisheng Zhang wrote:
> Dear Ludovic,
>
> On Wed, 6 Jan 2016 10:02:15 +0100 Ludovic Desroches wrote:
>
> > Hi Jisheng,
> >
> > Thanks for your patch but it needs to be updated since it breaks this
> > driver.
> >
> > - struct sdhci_at91_priv *priv = pltfm_host->priv;
> > + struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host);
> >
> > is missing in sdhci_at91_runtime_suspend and sdhci_at91_runtime_resume
> > causing a NULL pointer dereference.
>
> My code base is 4.4-rc8.
> I didn't see sdhci_at91_runtime_suspend and sdhci_at91_runtime_resume
> functions in the sdhci-of-at91.c. Seems the at91 runtime pm support
> is newly added and intends for 4.5.
>
> So the question is which code base should I use?
To smooth the patch progress,
I'll post v3 based on git://git.linaro.org/people/ulf.hansson/mmc next branch
Thanks,
Jisheng
>
> Hi Ulf,
>
> could you please give some suggestions?
>
> Thanks in advance,
> Jisheng
>
> >
> > On Wed, Jan 06, 2016 at 11:55:59AM +0800, Jisheng Zhang wrote:
> > > Commit 0e748234293f ("mmc: sdhci: Add size for caller in init+register")
> > > allows users of sdhci_pltfm to allocate private space in calls to
> > > sdhci_pltfm_init+sdhci_pltfm_register. This patch migrates the
> > > sdhci-of-at91 driver to this allocation.
> > >
> > > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> > > Acked-by: Arnd Bergmann <arnd@...db.de>
> > > ---
> > > drivers/mmc/host/sdhci-of-at91.c | 21 ++++++++-------------
> > > 1 file changed, 8 insertions(+), 13 deletions(-)
> > >
> > > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> > > index 06d0b50..765eb09 100644
> > > --- a/drivers/mmc/host/sdhci-of-at91.c
> > > +++ b/drivers/mmc/host/sdhci-of-at91.c
> > > @@ -68,11 +68,13 @@ static int sdhci_at91_probe(struct platform_device *pdev)
> > > return -EINVAL;
> > > soc_data = match->data;
> > >
> > > - priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> > > - if (!priv) {
> > > - dev_err(&pdev->dev, "unable to allocate private data\n");
> > > - return -ENOMEM;
> > > - }
> > > + host = sdhci_pltfm_init(pdev, soc_data,
> > > + sizeof(*priv));
> >
> > Can be on the same line.
>
> Great! will do in v3.
>
> >
> > Regards
> >
> > Ludovic
> >
> > > + if (IS_ERR(host))
> > > + return PTR_ERR(host);
> > > +
> > > + pltfm_host = sdhci_priv(host);
> > > + priv = sdhci_pltfm_priv(pltfm_host);
> > >
> > > priv->mainck = devm_clk_get(&pdev->dev, "baseclk");
> > > if (IS_ERR(priv->mainck)) {
> > > @@ -92,10 +94,6 @@ static int sdhci_at91_probe(struct platform_device *pdev)
> > > return PTR_ERR(priv->gck);
> > > }
> > >
> > > - host = sdhci_pltfm_init(pdev, soc_data, 0);
> > > - if (IS_ERR(host))
> > > - return PTR_ERR(host);
> > > -
> > > /*
> > > * The mult clock is provided by as a generated clock by the PMC
> > > * controller. In order to set the rate of gck, we have to get the
> > > @@ -135,9 +133,6 @@ static int sdhci_at91_probe(struct platform_device *pdev)
> > > clk_prepare_enable(priv->mainck);
> > > clk_prepare_enable(priv->gck);
> > >
> > > - pltfm_host = sdhci_priv(host);
> > > - pltfm_host->priv = priv;
> > > -
> > > ret = mmc_of_parse(host->mmc);
> > > if (ret)
> > > goto clocks_disable_unprepare;
> > > @@ -163,7 +158,7 @@ static int sdhci_at91_remove(struct platform_device *pdev)
> > > {
> > > struct sdhci_host *host = platform_get_drvdata(pdev);
> > > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > > - struct sdhci_at91_priv *priv = pltfm_host->priv;
> > > + struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > >
> > > sdhci_pltfm_unregister(pdev);
> > >
> > > --
> > > 2.7.0.rc3
> > >
>
>
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
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