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 f2c1cde9622136a8d8c6c6cf1d0e38a6c0b53971..b9fd5111d3f92e4a447484690134978f8caa5b6b 100644 (file)
--- a/drivers/staging/greybus/es1.c
+++ b/drivers/staging/greybus/es1.c
@@ -132,7 +132,7 @@ static void hd_buffer_constraints(struct greybus_host_device *hd)
         * 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);
 }