commit a9948b6194b46e489aa3b4d111d6dfd786c39c4b
author David Brownell <david-b@pacbell.net> Sun Apr 02 10:37:40 2006 -0800
committer Greg Kroah-Hartman <gregkh@suse.de> Tue May 16 14:33:57 2006 -0700
tree 28f4984be0547c773ad24ef6ed882f1ae9cbede8
parent 747d844ee9a183ff3067bb1181f2a25c50649538

[PATCH] SPI: spi bounce buffer has a minimum length

Make sure that spi_write_then_read() can always handle at least 32 bytes
of transfer (total, both directions), minimizing one portability issue.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/spi/spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 94f5e8e..1168ef0 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -522,7 +522,8 @@
 }
 EXPORT_SYMBOL_GPL(spi_sync);
 
-#define	SPI_BUFSIZ	(SMP_CACHE_BYTES)
+/* portable code must never pass more than 32 bytes */
+#define	SPI_BUFSIZ	max(32,SMP_CACHE_BYTES)
 
 static u8	*buf;