diff options
author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2007-09-30 22:39:36 +0400 |
---|---|---|
committer | Len Brown <len.brown@intel.com> | 2007-10-10 01:00:26 -0400 |
commit | d30dc9abb4aacfd4df3f486f22bcbc0531b73283 (patch) | |
tree | cb2d69e1b5fc00ad7a6691f362e814ddd6af61fa /drivers/acpi/hardware/hwregs.c | |
parent | bbf25010f1a6b761914430f5fca081ec8c7accd1 (diff) |
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: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/hardware/hwregs.c')
-rw-r--r-- | drivers/acpi/hardware/hwregs.c | 89 |
1 files changed, 35 insertions, 54 deletions
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c index 1d371fa663f..73f9c5fb1ba 100644 --- a/drivers/acpi/hardware/hwregs.c +++ b/drivers/acpi/hardware/hwregs.c @@ -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, ®ister_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, ®ister_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, ®ister_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); } |