* [PATCH 1/2] omap_hdq: Fix some error/debug handling.
2012-05-21 23:43 [PATCH] Two fixes for omap_hdq NeilBrown
@ 2012-05-21 23:43 ` NeilBrown
2012-05-21 23:43 ` [PATCH 2/2] omap_hdq: use wait_event_timeout to wait for read to complete NeilBrown
2012-05-22 0:30 ` [PATCH] Two fixes for omap_hdq Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: NeilBrown @ 2012-05-21 23:43 UTC (permalink / raw)
To: Greg KH; +Cc: Evgeniy Polyakov, linux-kernel
- some debug messages missed spaces
- sometimes no error was returned when it should have been
- sometimes a message is printed when there is no error, rather
than when there is one.
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/w1/masters/omap_hdq.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 5ef385b..3036b61 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -180,6 +180,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT);
if (ret == 0) {
dev_dbg(hdq_data->dev, "TX wait elapsed\n");
+ ret = -ETIMEDOUT;
goto out;
}
@@ -187,7 +188,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
/* check irqstatus */
if (!(*status & OMAP_HDQ_INT_STATUS_TXCOMPLETE)) {
dev_dbg(hdq_data->dev, "timeout waiting for"
- "TXCOMPLETE/RXCOMPLETE, %x", *status);
+ " TXCOMPLETE/RXCOMPLETE, %x", *status);
ret = -ETIMEDOUT;
goto out;
}
@@ -198,7 +199,7 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
OMAP_HDQ_FLAG_CLEAR, &tmp_status);
if (ret) {
dev_dbg(hdq_data->dev, "timeout waiting GO bit"
- "return to zero, %x", tmp_status);
+ " return to zero, %x", tmp_status);
}
out:
@@ -341,7 +342,7 @@ static int omap_hdq_break(struct hdq_data *hdq_data)
&tmp_status);
if (ret)
dev_dbg(hdq_data->dev, "timeout waiting INIT&GO bits"
- "return to zero, %x", tmp_status);
+ " return to zero, %x", tmp_status);
out:
mutex_unlock(&hdq_data->hdq_mutex);
@@ -386,7 +387,7 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
/* check irqstatus */
if (!(status & OMAP_HDQ_INT_STATUS_RXCOMPLETE)) {
dev_dbg(hdq_data->dev, "timeout waiting for"
- "RXCOMPLETE, %x", status);
+ " RXCOMPLETE, %x", status);
ret = -ETIMEDOUT;
goto out;
}
@@ -396,7 +397,7 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
out:
mutex_unlock(&hdq_data->hdq_mutex);
rtn:
- return 0;
+ return ret;
}
@@ -470,7 +471,7 @@ static int omap_hdq_put(struct hdq_data *hdq_data)
if (0 == hdq_data->hdq_usecount) {
dev_dbg(hdq_data->dev, "attempt to decrement use count"
- "when it is zero");
+ " when it is zero");
ret = -EINVAL;
} else {
hdq_data->hdq_usecount--;
@@ -540,7 +541,7 @@ static void omap_w1_write_byte(void *_hdq, u8 byte)
mutex_unlock(&hdq_data->hdq_mutex);
ret = hdq_write_byte(hdq_data, byte, &status);
- if (ret == 0) {
+ if (ret < 0) {
dev_dbg(hdq_data->dev, "TX failure:Ctrl status %x\n", status);
return;
}
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/2] omap_hdq: use wait_event_timeout to wait for read to complete.
2012-05-21 23:43 [PATCH] Two fixes for omap_hdq NeilBrown
2012-05-21 23:43 ` [PATCH 1/2] omap_hdq: Fix some error/debug handling NeilBrown
@ 2012-05-21 23:43 ` NeilBrown
2012-05-22 0:30 ` [PATCH] Two fixes for omap_hdq Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: NeilBrown @ 2012-05-21 23:43 UTC (permalink / raw)
To: Greg KH; +Cc: Evgeniy Polyakov, linux-kernel
There is no gain in having a loop - there is no risk of missing the
interrupt with wait_event_timeout.
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
---
drivers/w1/masters/omap_hdq.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 3036b61..848399b 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -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;
^ permalink raw reply related [flat|nested] 4+ messages in thread