[SPARC64] bbc_i2c: Fix kenvctrld eating %100 cpu.

Based almost entirely upon a patch by Joerg Friedrich

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/sbus/char/bbc_i2c.c b/drivers/sbus/char/bbc_i2c.c
index 22631f8..8410587 100644 (file)
--- a/drivers/sbus/char/bbc_i2c.c
+++ b/drivers/sbus/char/bbc_i2c.c
@@ -187,19 +187,20 @@ static int wait_for_pin(struct bbc_i2c_bus *bp, u8 *status)
        bp->waiting = 1;
        add_wait_queue(&bp->wq, &wait);
        while (limit-- > 0) {
-               u8 val;
-
-               set_current_state(TASK_INTERRUPTIBLE);
-               *status = val = readb(bp->i2c_control_regs + 0);
-               if ((val & I2C_PCF_PIN) == 0) {
+               unsigned long val;
+
+               val = wait_event_interruptible_timeout(
+                               bp->wq,
+                               (((*status = readb(bp->i2c_control_regs + 0))
+                                 & I2C_PCF_PIN) == 0),
+                               msecs_to_jiffies(250));
+               if (val > 0) {
                        ret = 0;
                        break;
                }
-               msleep_interruptible(250);
        }
        remove_wait_queue(&bp->wq, &wait);
        bp->waiting = 0;
-       current->state = TASK_RUNNING;
 
        return ret;
 }
@@ -340,7 +341,7 @@ static irqreturn_t bbc_i2c_interrupt(int irq, void *dev_id)
         */
        if (bp->waiting &&
            !(readb(bp->i2c_control_regs + 0x0) & I2C_PCF_PIN))
-               wake_up(&bp->wq);
+               wake_up_interruptible(&bp->wq);
 
        return IRQ_HANDLED;
 }