diff options
| author | David Miller <davem@davemloft.net> | 2007-02-27 11:10:07 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-03-09 10:50:26 -0800 |
| commit | ede6d26177a046ab7f14840e10cb2bbda6bc91df (patch) | |
| tree | 9362f4b37dbfb58e51d474405d8b306acde00ff1 /drivers | |
| parent | 03670c6e904a3d9651233f08ead30f530a9a29a2 (diff) | |
Fix %100 cpu spinning on sparc64
[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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/sbus/char/bbc_i2c.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/sbus/char/bbc_i2c.c b/drivers/sbus/char/bbc_i2c.c index 22631f8b9b48..8410587348f1 100644 --- 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; } |