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author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2005-11-25 12:28:53 +0900 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-09 12:13:17 -0800 |
commit | bd62e271401c5ebf33a0dd24d89baf706f213251 (patch) | |
tree | 77b8e2cd249df83b0d256f8126047a037a1fc542 /drivers/pci/hotplug/shpchp_ctrl.c | |
parent | f467f6187fc60c954a9509b3a3e17ef89a4f6f22 (diff) | |
download | op-kernel-dev-bd62e271401c5ebf33a0dd24d89baf706f213251.zip op-kernel-dev-bd62e271401c5ebf33a0dd24d89baf706f213251.tar.gz |
[PATCH] shpchp: fix improper wait for command completion
Current SHPCHP driver uses msleep_interruptible() function to wait for
a command completion event. But I think this would cause an unnecessary
long wait until timeout, if command completion interrupt came before
task state was changed to TASK_INTERRUPTIBLE. This patch fixes this
issue. With this patch, command completion becomes faster as follows:
o Without this patch
# time echo 1 > power
real 0m4.708s
user 0m0.000s
sys 0m0.524s
o With this patch
# time echo 1 > power
real 0m2.221s
user 0m0.000s
sys 0m0.532s
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/hotplug/shpchp_ctrl.c')
-rw-r--r-- | drivers/pci/hotplug/shpchp_ctrl.c | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c index 5861935..25ccb0e 100644 --- a/drivers/pci/hotplug/shpchp_ctrl.c +++ b/drivers/pci/hotplug/shpchp_ctrl.c @@ -248,7 +248,6 @@ static int change_bus_speed(struct controller *ctrl, struct slot *p_slot, up(&ctrl->crit_sect); return WRONG_BUS_FREQUENCY; } - wait_for_ctrl_irq (ctrl); if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) { err("%s: Can't set bus speed/mode in the case of adapter & bus mismatch\n", @@ -330,9 +329,6 @@ static int board_added(struct slot *p_slot) up(&ctrl->crit_sect); return -1; } - - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); rc = p_slot->hpc_ops->check_cmd_status(ctrl); if (rc) { @@ -352,7 +348,6 @@ static int board_added(struct slot *p_slot) up(&ctrl->crit_sect); return WRONG_BUS_FREQUENCY; } - wait_for_ctrl_irq (ctrl); if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) { err("%s: Can't set bus speed/mode in the case of adapter & bus mismatch\n", @@ -367,7 +362,6 @@ static int board_added(struct slot *p_slot) up(&ctrl->crit_sect); return rc; } - wait_for_ctrl_irq (ctrl); if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) { err("%s: Failed to enable slot, error code(%d)\n", __FUNCTION__, rc); @@ -494,7 +488,6 @@ static int board_added(struct slot *p_slot) up(&ctrl->crit_sect); return rc; } - wait_for_ctrl_irq (ctrl); if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) { err("%s: Failed to enable slot, error code(%d)\n", __FUNCTION__, rc); @@ -532,9 +525,6 @@ static int board_added(struct slot *p_slot) p_slot->hpc_ops->green_led_on(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); - /* Done with exclusive hardware access */ up(&ctrl->crit_sect); @@ -552,8 +542,6 @@ err_exit: up(&ctrl->crit_sect); return rc; } - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); rc = p_slot->hpc_ops->check_cmd_status(ctrl); if (rc) { @@ -603,8 +591,6 @@ static int remove_board(struct slot *p_slot) up(&ctrl->crit_sect); return rc; } - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); rc = p_slot->hpc_ops->check_cmd_status(ctrl); if (rc) { @@ -621,8 +607,6 @@ static int remove_board(struct slot *p_slot) up(&ctrl->crit_sect); return rc; } - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); /* Done with exclusive hardware access */ up(&ctrl->crit_sect); @@ -676,9 +660,6 @@ static void shpchp_pushbutton_thread (unsigned long slot) p_slot->hpc_ops->green_led_off(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (p_slot->ctrl); - /* Done with exclusive hardware access */ up(&p_slot->ctrl->crit_sect); } @@ -790,14 +771,9 @@ static void interrupt_event_handler(struct controller *ctrl) down(&ctrl->crit_sect); p_slot->hpc_ops->green_led_on(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); p_slot->hpc_ops->set_attention_status(p_slot, 0); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); - /* Done with exclusive hardware access */ up(&ctrl->crit_sect); break; @@ -806,12 +782,8 @@ static void interrupt_event_handler(struct controller *ctrl) down(&ctrl->crit_sect); p_slot->hpc_ops->green_led_off(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); p_slot->hpc_ops->set_attention_status(p_slot, 0); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); /* Done with exclusive hardware access */ up(&ctrl->crit_sect); @@ -845,14 +817,9 @@ static void interrupt_event_handler(struct controller *ctrl) /* blink green LED and turn off amber */ p_slot->hpc_ops->green_led_blink(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); p_slot->hpc_ops->set_attention_status(p_slot, 0); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); - /* Done with exclusive hardware access */ up(&ctrl->crit_sect); @@ -870,12 +837,8 @@ static void interrupt_event_handler(struct controller *ctrl) down(&ctrl->crit_sect); p_slot->hpc_ops->set_attention_status(p_slot, 1); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); p_slot->hpc_ops->green_led_off(p_slot); - /* Wait for the command to complete */ - wait_for_ctrl_irq (ctrl); /* Done with exclusive hardware access */ up(&ctrl->crit_sect); |