1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index 0f5122eb282b..4a02d2508bc8 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -511,10 +511,16 @@ SPI MASTER METHODS
         This sets up the device clock rate, SPI mode, and word sizes.
         Drivers may change the defaults provided by board_info, and then
         call spi_setup(spi) to invoke this routine.  It may sleep.
+
         Unless each SPI slave has its own configuration registers, don't
         change them right away ... otherwise drivers could corrupt I/O
         that's in progress for other SPI devices.
 
+                ** BUG ALERT:  for some reason the first version of
+                ** many spi_master drivers seems to get this wrong.
+                ** When you code setup(), ASSUME that the controller
+                ** is actively processing transfers for another device.
+
     master->transfer(struct spi_device *spi, struct spi_message *message)
         This must not sleep.  Its responsibility is arrange that the
         transfer happens and its complete() callback is issued.  The two