[PATCH] spi: add spi_set_drvdata() and spi_get_drvdata()

Add wrappers for getting and setting the driver data using spi_device
instead of using dev_{get|set}_drvdata with &spi->dev, to mirror the
platform_{get|set}_drvdata.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index 7279579..81b6230d 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -312,7 +312,7 @@
 		chip = kzalloc(sizeof *chip, GFP_KERNEL);
 		if (!chip)
 			return -ENOMEM;
-		dev_set_drvdata(&spi->dev, chip);
+		spi_set_drvdata(spi, chip);
 
 		... etc
 		return 0;