提交 b7e938d0 编写于 作者: N NeilBrown 提交者: Greg Kroah-Hartman

w1: omap_hdq: use wait_event_timeout to wait for read to complete.

There is no gain in having a loop - there is no risk of missing the
interrupt with wait_event_timeout.
Signed-off-by: NNeilBrown <neilb@suse.de>
Acked-by: NEvgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 7b5362a6
......@@ -354,7 +354,6 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
{
int ret = 0;
u8 status;
unsigned long timeout = jiffies + OMAP_HDQ_TIMEOUT;
ret = mutex_lock_interruptible(&hdq_data->hdq_mutex);
if (ret < 0) {
......@@ -372,15 +371,13 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO,
OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO);
/*
* The RX comes immediately after TX. It
* triggers another interrupt before we
* sleep. So we have to wait for RXCOMPLETE bit.
* The RX comes immediately after TX.
*/
while (!(hdq_data->hdq_irqstatus
& OMAP_HDQ_INT_STATUS_RXCOMPLETE)
&& time_before(jiffies, timeout)) {
schedule_timeout_uninterruptible(1);
}
wait_event_timeout(hdq_wait_queue,
(hdq_data->hdq_irqstatus
& OMAP_HDQ_INT_STATUS_RXCOMPLETE),
OMAP_HDQ_TIMEOUT);
hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, 0,
OMAP_HDQ_CTRL_STATUS_DIR);
status = hdq_data->hdq_irqstatus;
......
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