Merge remote-tracking branch 'spi/fix/core' into spi-linus

1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 349ebba..965dd8a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -370,6 +370,17 @@ static void spi_dev_set_name(struct spi_device *spi)
 		     spi->chip_select);
 }
 
+static int spi_dev_check(struct device *dev, void *data)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct spi_device *new_spi = data;
+
+	if (spi->master == new_spi->master &&
+	    spi->chip_select == new_spi->chip_select)
+		return -EBUSY;
+	return 0;
+}
+
 /**
  * spi_add_device - Add spi_device allocated with spi_alloc_device
  * @spi: spi_device to register
@@ -384,7 +395,6 @@ int spi_add_device(struct spi_device *spi)
 	static DEFINE_MUTEX(spi_add_lock);
 	struct spi_master *master = spi->master;
 	struct device *dev = master->dev.parent;
-	struct device *d;
 	int status;
 
 	/* Chipselects are numbered 0..max; validate. */
@@ -404,12 +414,10 @@ int spi_add_device(struct spi_device *spi)
 	 */
 	mutex_lock(&spi_add_lock);
 
-	d = bus_find_device_by_name(&spi_bus_type, NULL, dev_name(&spi->dev));
-	if (d != NULL) {
+	status = bus_for_each_dev(&spi_bus_type, NULL, spi, spi_dev_check);
+	if (status) {
 		dev_err(dev, "chipselect %d already in use\n",
 				spi->chip_select);
-		put_device(d);
-		status = -EBUSY;
 		goto done;
 	}
 
@@ -591,8 +599,10 @@ static int spi_transfer_one_message(struct spi_master *master,
 			goto out;
 		}
 
-		if (ret > 0)
+		if (ret > 0) {
+			ret = 0;
 			wait_for_completion(&master->xfer_completion);
+		}
 
 		trace_spi_transfer_stop(msg, xfer);
 
@@ -632,7 +642,7 @@ out:
  *
  * Called by SPI drivers using the core transfer_one_message()
  * implementation to notify it that the current interrupt driven
- * transfer has finised and the next one may be scheduled.
+ * transfer has finished and the next one may be scheduled.
  */
 void spi_finalize_current_transfer(struct spi_master *master)
 {
@@ -735,7 +745,9 @@ static void spi_pump_messages(struct kthread_work *work)
 	ret = master->transfer_one_message(master, master->cur_msg);
 	if (ret) {
 		dev_err(&master->dev,
-			"failed to transfer one message from queue\n");
+			"failed to transfer one message from queue: %d\n", ret);
+		master->cur_msg->status = ret;
+		spi_finalize_current_message(master);
 		return;
 	}
 }