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Commit 1896b15e authored by Brian Norris's avatar Brian Norris Committed by Jeff Garzik
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ahci_platform: perform platform exit in host_stop() hook 



AHCI platform devices may provide an exit() routine, via
ahci_platform_data, that powers off the SATA core. Such a routine should
be executed from the ata_port_operations host_stop() hook. That way, the
ATA subsystem can perform any last-minute hardware cleanup (via devres,
for example), then trigger the power-off at the appropriate time.

This patch fixes bus errors triggered during module removal or device
unbinding, seen on an SoC SATA core.

Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 9a99e476

drivers/ata/ahci_platform.c

+23 −7
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#include <linux/ahci_platform.h>

#include "ahci.h"



static void ahci_host_stop(struct ata_host *host);



enum ahci_type {

	AHCI,		/* standard platform ahci */

	IMX53_AHCI,	/* ahci on i.mx53 */
@@ -47,6 +49,15 @@ static struct platform_device_id ahci_devtype[] = { 
};

MODULE_DEVICE_TABLE(platform, ahci_devtype);



struct ata_port_operations ahci_platform_ops = {

	.inherits	= &ahci_ops,

	.host_stop	= ahci_host_stop,

};



struct ata_port_operations ahci_platform_retry_srst_ops = {

	.inherits	= &ahci_pmp_retry_srst_ops,

	.host_stop	= ahci_host_stop,

};



static const struct ata_port_info ahci_port_info[] = {

	/* by features */
@@ -54,20 +65,20 @@ static const struct ata_port_info ahci_port_info[] = { 
		.flags		= AHCI_FLAG_COMMON,

		.pio_mask	= ATA_PIO4,

		.udma_mask	= ATA_UDMA6,

		.port_ops	= &ahci_ops,

		.port_ops	= &ahci_platform_ops,

	},

	[IMX53_AHCI] = {

		.flags		= AHCI_FLAG_COMMON,

		.pio_mask	= ATA_PIO4,

		.udma_mask	= ATA_UDMA6,

		.port_ops	= &ahci_pmp_retry_srst_ops,

		.port_ops	= &ahci_platform_retry_srst_ops,

	},

	[STRICT_AHCI] = {

		AHCI_HFLAGS	(AHCI_HFLAG_DELAY_ENGINE),

		.flags		= AHCI_FLAG_COMMON,

		.pio_mask	= ATA_PIO4,

		.udma_mask	= ATA_UDMA6,

		.port_ops	= &ahci_ops,

		.port_ops	= &ahci_platform_ops,

	},

};
@@ -221,12 +232,19 @@ static int __devinit ahci_probe(struct platform_device *pdev) 
static int __devexit ahci_remove(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct ahci_platform_data *pdata = dev_get_platdata(dev);

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;



	ata_host_detach(host);



	return 0;

}



static void ahci_host_stop(struct ata_host *host)

{

	struct device *dev = host->dev;

	struct ahci_platform_data *pdata = dev_get_platdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;



	if (pdata && pdata->exit)

		pdata->exit(dev);
@@ -234,8 +252,6 @@ static int __devexit ahci_remove(struct platform_device *pdev) 
		clk_disable_unprepare(hpriv->clk);

		clk_put(hpriv->clk);

	}



	return 0;

}



#ifdef CONFIG_PM_SLEEP