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Commit d30dc9ab authored by Alexey Starikovskiy's avatar Alexey Starikovskiy Committed by Len Brown
Browse files

ACPICA: hw: remove use_lock flag from acpi_hw_register_{read, write} 



use_lock flag is used once for acpi_hw_register_read, and never for
acpi_hw_register_write. It will greatly simplify understanding of
locking if we just drop this use_lock altogether, and wrap the only call
to ..._read in lock/unlock.

Signed-off-by: default avatarAlexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent bbf25010

drivers/acpi/events/evevent.c

+2 −4
Original line number Diff line number Diff line
@@ -239,10 +239,8 @@ u32 acpi_ev_fixed_event_detect(void) 
	 * Read the fixed feature status and enable registers, as all the cases

	 * depend on their values.  Ignore errors here.

	 */

	(void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

				    ACPI_REGISTER_PM1_STATUS, &fixed_status);

	(void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

				    ACPI_REGISTER_PM1_ENABLE, &fixed_enable);

	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);

	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);



	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,

			  "Fixed Event Block: Enable %08X Status %08X\n",

drivers/acpi/hardware/hwregs.c

+35 −54
Original line number Diff line number Diff line
@@ -75,8 +75,7 @@ acpi_status acpi_hw_clear_acpi_status(void) 


	lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);



	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

					ACPI_REGISTER_PM1_STATUS,

	status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,

					ACPI_BITMASK_ALL_FIXED_STATUS);

	if (ACPI_FAILURE(status)) {

		goto unlock_and_exit;
@@ -259,7 +258,7 @@ struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id) 
 *

 ******************************************************************************/



acpi_status acpi_get_register(u32 register_id, u32 * return_value)

acpi_status acpi_get_register_unlocked(u32 register_id, u32 * return_value)

{

	u32 register_value = 0;

	struct acpi_bit_register_info *bit_reg_info;
@@ -276,8 +275,7 @@ acpi_status acpi_get_register(u32 register_id, u32 * return_value) 


	/* Read from the register */



	status = acpi_hw_register_read(ACPI_MTX_LOCK,

				       bit_reg_info->parent_register,

	status = acpi_hw_register_read(bit_reg_info->parent_register,

				       &register_value);



	if (ACPI_SUCCESS(status)) {
@@ -298,6 +296,16 @@ acpi_status acpi_get_register(u32 register_id, u32 * return_value) 
	return_ACPI_STATUS(status);

}



acpi_status acpi_get_register(u32 register_id, u32 * return_value)

{

	acpi_status status;

	acpi_cpu_flags flags;

	flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);

	status = acpi_get_register_unlocked(register_id, return_value);

	acpi_os_release_lock(acpi_gbl_hardware_lock, flags);

	return status;

}



ACPI_EXPORT_SYMBOL(acpi_get_register)



/*******************************************************************************
@@ -335,8 +343,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value) 


	/* Always do a register read first so we can insert the new bits  */



	status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

				       bit_reg_info->parent_register,

	status = acpi_hw_register_read(bit_reg_info->parent_register,

				       &register_value);

	if (ACPI_FAILURE(status)) {

		goto unlock_and_exit;
@@ -363,8 +370,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value) 
						   bit_reg_info->

						   access_bit_mask);

		if (value) {

			status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

							ACPI_REGISTER_PM1_STATUS,

			status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,

							(u16) value);

			register_value = 0;

		}
@@ -377,8 +383,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value) 
					   bit_reg_info->access_bit_mask,

					   value);



		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						ACPI_REGISTER_PM1_ENABLE,

		status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,

						(u16) register_value);

		break;
@@ -397,15 +402,13 @@ acpi_status acpi_set_register(u32 register_id, u32 value) 
					   bit_reg_info->access_bit_mask,

					   value);



		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						ACPI_REGISTER_PM1_CONTROL,

		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,

						(u16) register_value);

		break;



	case ACPI_REGISTER_PM2_CONTROL:



		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

					       ACPI_REGISTER_PM2_CONTROL,

		status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,

					       &register_value);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;
@@ -430,8 +433,7 @@ acpi_status acpi_set_register(u32 register_id, u32 value) 
						     xpm2_control_block.

						     address)));



		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						ACPI_REGISTER_PM2_CONTROL,

		status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,

						(u8) (register_value));

		break;
@@ -461,8 +463,7 @@ ACPI_EXPORT_SYMBOL(acpi_set_register) 
 *

 * FUNCTION:    acpi_hw_register_read

 *

 * PARAMETERS:  use_lock            - Lock hardware? True/False

 *              register_id         - ACPI Register ID

 * PARAMETERS:  register_id         - ACPI Register ID

 *              return_value        - Where the register value is returned

 *

 * RETURN:      Status and the value read.
@@ -471,19 +472,14 @@ ACPI_EXPORT_SYMBOL(acpi_set_register) 
 *

 ******************************************************************************/

acpi_status

acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)

acpi_hw_register_read(u32 register_id, u32 * return_value)

{

	u32 value1 = 0;

	u32 value2 = 0;

	acpi_status status;

	acpi_cpu_flags lock_flags = 0;



	ACPI_FUNCTION_TRACE(hw_register_read);



	if (ACPI_MTX_LOCK == use_lock) {

		lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);

	}



	switch (register_id) {

	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */
@@ -491,7 +487,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
		    acpi_hw_low_level_read(16, &value1,

					   &acpi_gbl_FADT.xpm1a_event_block);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* PM1B is optional */
@@ -507,7 +503,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
		status =

		    acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* PM1B is optional */
@@ -523,7 +519,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
		    acpi_hw_low_level_read(16, &value1,

					   &acpi_gbl_FADT.xpm1a_control_block);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		status =
@@ -558,10 +554,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
		break;

	}



      unlock_and_exit:

	if (ACPI_MTX_LOCK == use_lock) {

		acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);

	}

      exit:



	if (ACPI_SUCCESS(status)) {

		*return_value = value1;
@@ -574,8 +567,7 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
 *

 * FUNCTION:    acpi_hw_register_write

 *

 * PARAMETERS:  use_lock            - Lock hardware? True/False

 *              register_id         - ACPI Register ID

 * PARAMETERS:  register_id         - ACPI Register ID

 *              Value               - The value to write

 *

 * RETURN:      Status
@@ -597,28 +589,22 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) 
 *

 ******************************************************************************/



acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)

acpi_status acpi_hw_register_write(u32 register_id, u32 value)

{

	acpi_status status;

	acpi_cpu_flags lock_flags = 0;

	u32 read_value;



	ACPI_FUNCTION_TRACE(hw_register_write);



	if (ACPI_MTX_LOCK == use_lock) {

		lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);

	}



	switch (register_id) {

	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */



		/* Perform a read first to preserve certain bits (per ACPI spec) */



		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

					       ACPI_REGISTER_PM1_STATUS,

		status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS,

					       &read_value);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* Insert the bits to be preserved */
@@ -632,7 +618,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) 
		    acpi_hw_low_level_write(16, value,

					    &acpi_gbl_FADT.xpm1a_event_block);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* PM1B is optional */
@@ -647,7 +633,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) 
		status =

		    acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* PM1B is optional */
@@ -661,11 +647,10 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) 
		/*

		 * Perform a read first to preserve certain bits (per ACPI spec)

		 */

		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

					       ACPI_REGISTER_PM1_CONTROL,

		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,

					       &read_value);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		/* Insert the bits to be preserved */
@@ -679,7 +664,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) 
		    acpi_hw_low_level_write(16, value,

					    &acpi_gbl_FADT.xpm1a_control_block);

		if (ACPI_FAILURE(status)) {

			goto unlock_and_exit;

			goto exit;

		}



		status =
@@ -728,11 +713,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) 
		break;

	}



      unlock_and_exit:

	if (ACPI_MTX_LOCK == use_lock) {

		acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);

	}



      exit:

	return_ACPI_STATUS(status);

}

drivers/acpi/hardware/hwsleep.c

+9 −18
Original line number Diff line number Diff line
@@ -313,8 +313,7 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 


	/* Get current value of PM1A control */



	status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

				       ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);

	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}
@@ -341,15 +340,13 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 


	/* Write #1: fill in SLP_TYP data */



	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

					ACPI_REGISTER_PM1A_CONTROL,

	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,

					PM1Acontrol);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

					ACPI_REGISTER_PM1B_CONTROL,

	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,

					PM1Bcontrol);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);
@@ -364,15 +361,13 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 


	ACPI_FLUSH_CPU_CACHE();



	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

					ACPI_REGISTER_PM1A_CONTROL,

	status = acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,

					PM1Acontrol);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

					ACPI_REGISTER_PM1B_CONTROL,

	status = acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,

					PM1Bcontrol);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);
@@ -392,8 +387,7 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 
		 */

		acpi_os_stall(10000000);



		status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						ACPI_REGISTER_PM1_CONTROL,

		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,

						sleep_enable_reg_info->

						access_bit_mask);

		if (ACPI_FAILURE(status)) {
@@ -520,8 +514,7 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state) 


		/* Get current value of PM1A control */



		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,

					       ACPI_REGISTER_PM1_CONTROL,

		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,

					       &PM1Acontrol);

		if (ACPI_SUCCESS(status)) {
@@ -543,11 +536,9 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state) 


			/* Just ignore any errors */



			(void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						     ACPI_REGISTER_PM1A_CONTROL,

			(void)acpi_hw_register_write(ACPI_REGISTER_PM1A_CONTROL,

						     PM1Acontrol);

			(void)acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,

						     ACPI_REGISTER_PM1B_CONTROL,

			(void)acpi_hw_register_write(ACPI_REGISTER_PM1B_CONTROL,

						     PM1Bcontrol);

		}

	}

include/acpi/achware.h

+2 −2
Original line number Diff line number Diff line
@@ -71,9 +71,9 @@ u32 acpi_hw_get_mode(void); 
struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id);



acpi_status

acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value);

acpi_hw_register_read(u32 register_id, u32 * return_value);



acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value);

acpi_status acpi_hw_register_write(u32 register_id, u32 value);



acpi_status

acpi_hw_low_level_read(u32 width,