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Commit e0e2674b authored by Peter Griffin's avatar Peter Griffin Committed by Tejun Heo
Browse files

ata: ahci_st: fixup layering violations / drvdata errors 



Brian noticed while working on another SATA driver that uses libahci_platform,
an error in this driver; it tries to the the driver data for its
device, while libata also thinks it can set the driver data. See:

  ahci_platform_init_host()
  -> ata_host_alloc_pinfo()
     -> ata_host_alloc()
        -> dev_set_drvdata()

So instead of sticking the IP-specific platform data into drvdata, let's
use the plat_data variable that is reserved for this use.

Addtionally plat_data isn't set until ahci_platform_init_host() has been
called further down in probe(). So re-work the st_ahci_probe_resets and
st_ahci_deassert_resets functions to take ahci_host_priv *hpriv as a
parameter.

Signed-off-by: default avatarPeter Griffin <peter.griffin@linaro.org>
Suggested-by: default avatarBrian Norris <computersforpeace@gmail.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 5df07b74

drivers/ata/ahci_st.c

+24 −25
Original line number Diff line number Diff line
@@ -37,7 +37,6 @@ struct st_ahci_drv_data { 
	struct reset_control *pwr;

	struct reset_control *sw_rst;

	struct reset_control *pwr_rst;

	struct ahci_host_priv *hpriv;

};



static void st_ahci_configure_oob(void __iomem *mmio)
@@ -55,9 +54,10 @@ static void st_ahci_configure_oob(void __iomem *mmio) 
	writel(new_val, mmio + ST_AHCI_OOBR);

}



static int st_ahci_deassert_resets(struct device *dev)

static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,

				struct device *dev)

{

	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);

	struct st_ahci_drv_data *drv_data = hpriv->plat_data;

	int err;



	if (drv_data->pwr) {
@@ -90,8 +90,8 @@ static int st_ahci_deassert_resets(struct device *dev) 
static void st_ahci_host_stop(struct ata_host *host)

{

	struct ahci_host_priv *hpriv = host->private_data;

	struct st_ahci_drv_data *drv_data = hpriv->plat_data;

	struct device *dev = host->dev;

	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);

	int err;



	if (drv_data->pwr) {
@@ -103,29 +103,30 @@ static void st_ahci_host_stop(struct ata_host *host) 
	ahci_platform_disable_resources(hpriv);

}



static int st_ahci_probe_resets(struct platform_device *pdev)

static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,

				struct device *dev)

{

	struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);

	struct st_ahci_drv_data *drv_data = hpriv->plat_data;



	drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");

	drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");

	if (IS_ERR(drv_data->pwr)) {

		dev_info(&pdev->dev, "power reset control not defined\n");

		dev_info(dev, "power reset control not defined\n");

		drv_data->pwr = NULL;

	}



	drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");

	drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");

	if (IS_ERR(drv_data->sw_rst)) {

		dev_info(&pdev->dev, "soft reset control not defined\n");

		dev_info(dev, "soft reset control not defined\n");

		drv_data->sw_rst = NULL;

	}



	drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");

	drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");

	if (IS_ERR(drv_data->pwr_rst)) {

		dev_dbg(&pdev->dev, "power soft reset control not defined\n");

		dev_dbg(dev, "power soft reset control not defined\n");

		drv_data->pwr_rst = NULL;

	}



	return st_ahci_deassert_resets(&pdev->dev);

	return st_ahci_deassert_resets(hpriv, dev);

}



static struct ata_port_operations st_ahci_port_ops = {
@@ -154,15 +155,12 @@ static int st_ahci_probe(struct platform_device *pdev) 
	if (!drv_data)

		return -ENOMEM;



	platform_set_drvdata(pdev, drv_data);



	hpriv = ahci_platform_get_resources(pdev);

	if (IS_ERR(hpriv))

		return PTR_ERR(hpriv);

	hpriv->plat_data = drv_data;



	drv_data->hpriv = hpriv;



	err = st_ahci_probe_resets(pdev);

	err = st_ahci_probe_resets(hpriv, &pdev->dev);

	if (err)

		return err;
@@ -170,7 +168,7 @@ static int st_ahci_probe(struct platform_device *pdev) 
	if (err)

		return err;



	st_ahci_configure_oob(drv_data->hpriv->mmio);

	st_ahci_configure_oob(hpriv->mmio);



	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,

				      &ahci_platform_sht);
@@ -185,8 +183,9 @@ static int st_ahci_probe(struct platform_device *pdev) 
#ifdef CONFIG_PM_SLEEP

static int st_ahci_suspend(struct device *dev)

{

	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = drv_data->hpriv;

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;

	struct st_ahci_drv_data *drv_data = hpriv->plat_data;

	int err;



	err = ahci_platform_suspend_host(dev);
@@ -208,21 +207,21 @@ static int st_ahci_suspend(struct device *dev) 


static int st_ahci_resume(struct device *dev)

{

	struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = drv_data->hpriv;

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;

	int err;



	err = ahci_platform_enable_resources(hpriv);

	if (err)

		return err;



	err = st_ahci_deassert_resets(dev);

	err = st_ahci_deassert_resets(hpriv, dev);

	if (err) {

		ahci_platform_disable_resources(hpriv);

		return err;

	}



	st_ahci_configure_oob(drv_data->hpriv->mmio);

	st_ahci_configure_oob(hpriv->mmio);



	return ahci_platform_resume_host(dev);

}