of/spi: Supply proper "spi:" modalias prefixes.

[David Daney <ddaney.cavm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: David Daney <david.daney-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

To get modprobe to automatically load the proper modules, we need to
prefix things with "spi:".  Partially based on Grant Likely's suggestions.

Signed-off-by: David Daney <david.daney-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 drivers/of/of_spi.c |    6 +++++-
 drivers/spi/spi.c   |    2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/of/of_spi.c b/drivers/of/of_spi.c
index 6dbc074..3486d2d 100644
--- a/drivers/of/of_spi.c
+++ b/drivers/of/of_spi.c
@@ -25,6 +25,7 @@ void of_register_spi_devices(struct spi_master *master)
 	struct spi_device *spi;
 	struct device_node *nc;
 	const __be32 *prop;
+	char request_module_modalias[SPI_NAME_SIZE + 4];
 	int rc;
 	int len;
 
@@ -86,7 +87,10 @@ void of_register_spi_devices(struct spi_master *master)
 		spi->dev.of_node = nc;
 
 		/* Register the new device */
-		request_module(spi->modalias);
+		snprintf(request_module_modalias,
+			 sizeof(request_module_modalias),
+			 "%s%s", SPI_MODULE_PREFIX, spi->modalias);
+		request_module(request_module_modalias);
 		rc = spi_add_device(spi);
 		if (rc) {
 			dev_err(&master->dev, "spi_device register error %s\n",
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3d8f662..da8aac7 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -51,7 +51,7 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
 {
 	const struct spi_device	*spi = to_spi_device(dev);
 
-	return sprintf(buf, "%s\n", spi->modalias);
+	return sprintf(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias);
 }
 
 static struct device_attribute spi_dev_attrs[] = {

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