greybus: es1: fix buffer-size limit
The maximum buffer size does not include the headroom, so subtract the
headroom size from the actual buffer size.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
diff --git a/drivers/staging/greybus/es1.c b/drivers/staging/greybus/es1.c
index f2c1cde..b9fd511 100644
--- a/drivers/staging/greybus/es1.c
+++ b/drivers/staging/greybus/es1.c
@@ -132,7 +132,7 @@
* that's better aligned for the user.
*/
hd->buffer_headroom = sizeof(u32); /* For cport id */
- hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX;
+ hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX - hd->buffer_headroom;
BUILD_BUG_ON(hd->buffer_headroom > GB_BUFFER_HEADROOM_MAX);
}