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alistair23-linux
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[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>
hifive-unleashed-5.1
David S. Miller 2007-02-26 10:11:35 -08:00
parent abfd336cd7
commit 3b36fb8471
1 changed files with 8 additions and 7 deletions
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15
drivers/sbus/char/bbc_i2c.c
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@ -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;
unsigned long val;
set_current_state(TASK_INTERRUPTIBLE);
*status = val = readb(bp->i2c_control_regs + 0);
if ((val & I2C_PCF_PIN) == 0) {
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;
}