mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

greybus: enforce a buffer headroom maximum size 

Define a maximum size that a host device can use for its private
area ahead of the payload space used by Greybus in a message buffer.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
This commit is contained in:
Alex Elder 2014-12-02 08:30:34 -06:00 committed by Greg Kroah-Hartman
parent dc779229b5
commit 835fb5e498
2 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/staging/greybus/es1-ap-usb.c
View File

@ -127,6 +127,7 @@ static void hd_buffer_constraints(struct greybus_host_device *hd)
*/
hd->buffer_headroom = sizeof(u32); /* For cport id */
hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX;
BUILD_BUG_ON(hd->buffer_headroom > GB_BUFFER_HEADROOM_MAX);
}
#define ES1_TIMEOUT 500 /* 500 ms for the SVC to do something */

8
drivers/staging/greybus/greybus.h
View File

@ -69,6 +69,14 @@
struct greybus_host_device;
struct svc_msg;
/*
* When the Greybus code allocates a buffer it sets aside bytes
* prior to the beginning of the payload area for the host device's
* exclusive use. The size is specified by hd->buffer_headroom, and
* which can't be greater than GB_BUFFER_HEADROOM_MAX.
*/
#define GB_BUFFER_HEADROOM_MAX sizeof(u64)
/* Buffers allocated from the host driver will be aligned to this multiple */
#define GB_BUFFER_ALIGN sizeof(u32)