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Commit 2bf427b2 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by David S. Miller
Browse files

ide: fix resume for CONFIG_BLK_DEV_IDEACPI=y 



commit 2f0d0fd2 ("ide-acpi: cleanup
do_drive_get_GTF()") didn't account for the lack of hwif->acpidata
check in generic_ide_suspend() [ indirect user of do_drive_get_GTF()
through ide_acpi_exec_tfs() ] resulting in broken resume when ACPI
support is enabled but ACPI data is unavailable.

Fix it by adding ide_port_acpi() helper for checking if port needs
ACPI handling and cleaning generic_ide_{suspend,resume}() to use it
instead of hiding hwif->acpidata and ide_noacpi checks in IDE ACPI
helpers (this should help in preventing similar bugs in the future).

While at it:
- kill superfluous debugging printks in ide_acpi_{get,push}_timing()

Reported-and-tested-by: default avatarEtienne Basset <etienne.basset@numericable.fr>
Also-reported-and-tested-by: default avatarJeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9c72ebef

drivers/ide/ide-acpi.c

+7 −30
Original line number Diff line number Diff line
@@ -92,6 +92,11 @@ int ide_acpi_init(void) 
	return 0;

}



bool ide_port_acpi(ide_hwif_t *hwif)

{

	return ide_noacpi == 0 && hwif->acpidata;

}



/**

 * ide_get_dev_handle - finds acpi_handle and PCI device.function

 * @dev: device to locate
@@ -352,9 +357,6 @@ int ide_acpi_exec_tfs(ide_drive_t *drive) 
	unsigned long	gtf_address;

	unsigned long	obj_loc;



	if (ide_noacpi)

		return 0;



	DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);



	ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
@@ -389,16 +391,6 @@ void ide_acpi_get_timing(ide_hwif_t *hwif) 
	struct acpi_buffer	output;

	union acpi_object 	*out_obj;



	if (ide_noacpi)

		return;



	DEBPRINT("ENTER:\n");



	if (!hwif->acpidata) {

		DEBPRINT("no ACPI data for %s\n", hwif->name);

		return;

	}



	/* Setting up output buffer for _GTM */

	output.length = ACPI_ALLOCATE_BUFFER;

	output.pointer = NULL;	/* ACPI-CA sets this; save/free it later */
@@ -479,16 +471,6 @@ void ide_acpi_push_timing(ide_hwif_t *hwif) 
	struct ide_acpi_drive_link	*master = &hwif->acpidata->master;

	struct ide_acpi_drive_link	*slave = &hwif->acpidata->slave;



	if (ide_noacpi)

		return;



	DEBPRINT("ENTER:\n");



	if (!hwif->acpidata) {

		DEBPRINT("no ACPI data for %s\n", hwif->name);

		return;

	}



	/* Give the GTM buffer + drive Identify data to the channel via the

	 * _STM method: */

	/* setup input parameters buffer for _STM */
@@ -527,16 +509,11 @@ void ide_acpi_set_state(ide_hwif_t *hwif, int on) 
	ide_drive_t *drive;

	int i;



	if (ide_noacpi || ide_noacpi_psx)

	if (ide_noacpi_psx)

		return;



	DEBPRINT("ENTER:\n");



	if (!hwif->acpidata) {

		DEBPRINT("no ACPI data for %s\n", hwif->name);

		return;

	}



	/* channel first and then drives for power on and verse versa for power off */

	if (on)

		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
@@ -616,7 +593,7 @@ void ide_acpi_port_init_devices(ide_hwif_t *hwif) 
				 drive->name, err);

	}



	if (!ide_acpionboot) {

	if (ide_noacpi || ide_acpionboot == 0) {

		DEBPRINT("ACPI methods disabled on boot\n");

		return;

	}

drivers/ide/ide-pm.c

+18 −12
Original line number Diff line number Diff line
@@ -10,9 +10,11 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg) 
	struct request_pm_state rqpm;

	int ret;



	if (ide_port_acpi(hwif)) {

		/* call ACPI _GTM only once */

		if ((drive->dn & 1) == 0 || pair == NULL)

			ide_acpi_get_timing(hwif);

	}



	memset(&rqpm, 0, sizeof(rqpm));

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
@@ -26,9 +28,11 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg) 
	ret = blk_execute_rq(drive->queue, NULL, rq, 0);

	blk_put_request(rq);



	if (ret == 0 && ide_port_acpi(hwif)) {

		/* call ACPI _PS3 only after both devices are suspended */

	if (ret == 0 && ((drive->dn & 1) || pair == NULL))

		if ((drive->dn & 1) || pair == NULL)

			ide_acpi_set_state(hwif, 0);

	}



	return ret;

}
@@ -42,6 +46,7 @@ int generic_ide_resume(struct device *dev) 
	struct request_pm_state rqpm;

	int err;



	if (ide_port_acpi(hwif)) {

		/* call ACPI _PS0 / _STM only once */

		if ((drive->dn & 1) == 0 || pair == NULL) {

			ide_acpi_set_state(hwif, 1);
@@ -49,6 +54,7 @@ int generic_ide_resume(struct device *dev) 
		}



		ide_acpi_exec_tfs(drive);

	}



	memset(&rqpm, 0, sizeof(rqpm));

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);

include/linux/ide.h

+2 −0
Original line number Diff line number Diff line
@@ -1419,6 +1419,7 @@ static inline void ide_dma_unmap_sg(ide_drive_t *drive, 


#ifdef CONFIG_BLK_DEV_IDEACPI

int ide_acpi_init(void);

bool ide_port_acpi(ide_hwif_t *hwif);

extern int ide_acpi_exec_tfs(ide_drive_t *drive);

extern void ide_acpi_get_timing(ide_hwif_t *hwif);

extern void ide_acpi_push_timing(ide_hwif_t *hwif);
@@ -1427,6 +1428,7 @@ void ide_acpi_port_init_devices(ide_hwif_t *); 
extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);

#else

static inline int ide_acpi_init(void) { return 0; }

static inline bool ide_port_acpi(ide_hwif_t *hwif) { return 0; }

static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }

static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }

static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }