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pciehp: fix wait command completion

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This patch fixes this problem that pciehp driver will sleep
unnecessarily long when waiting for command completion. With this
patch, modprobe pciehp driver becomes very faster as follows for
instance.

  o Without this patch
    # time /sbin/modprobe pciehp

    real    0m4.976s
    user    0m0.000s
    sys     0m0.004s

  o With this patch
    # time /sbin/modprobe pciehp

    real    0m0.640s
    user    0m0.000s
    sys     0m0.004s

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kenji Kaneshige 2006-12-21 17:01:10 -08:00 committed by Greg Kroah-Hartman
parent 44ef4cefb0
commit 262303fe32
2 changed files with 16 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/pci/hotplug/pciehp.h
View File

@ -100,6 +100,7 @@ struct controller {
u16 vendor_id;
u8 cap_base;
struct timer_list poll_timer;
volatile int cmd_busy;
};
#define INT_BUTTON_IGNORE 0

27
drivers/pci/hotplug/pciehp_hpc.c
View File

@ -251,20 +251,21 @@ static void start_int_poll_timer(struct controller *ctrl, int sec)
static inline int pcie_wait_cmd(struct controller *ctrl)
{
DECLARE_WAITQUEUE(wait, current);
int retval = 0;
unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
unsigned long timeout = msecs_to_jiffies(msecs);
int rc;
add_wait_queue(&ctrl->queue, &wait);
if (!pciehp_poll_mode)
/* Sleep for up to 1 second */
msleep_interruptible(1000);
else
msleep_interruptible(2500);
rc = wait_event_interruptible_timeout(ctrl->queue,
!ctrl->cmd_busy, timeout);
if (!rc)
dbg("Command not completed in 1000 msec\n");
else if (rc < 0) {
retval = -EINTR;
info("Command was interrupted by a signal\n");
}
remove_wait_queue(&ctrl->queue, &wait);
if (signal_pending(current))
return -EINTR;
return 0;
return retval;
}
static int pcie_write_cmd(struct slot *slot, u16 cmd)
@ -291,6 +292,7 @@ static int pcie_write_cmd(struct slot *slot, u16 cmd)
__FUNCTION__);
}
ctrl->cmd_busy = 1;
retval = pciehp_writew(ctrl, SLOTCTRL, (cmd | CMD_CMPL_INTR_ENABLE));
if (retval) {
err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
@ -773,6 +775,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
/*
* Command Complete Interrupt Pending
*/
ctrl->cmd_busy = 0;
wake_up_interruptible(&ctrl->queue);
}