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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-06-20 22:52:55 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-06-20 23:11:56 +0200
commit604f45167824e18ad5766e51ecf1d4d65f15118d (patch)
tree40deeca88e1788e98d54d82f429a45ce276c4135 /drivers/firewire
parentfirewire: cdev: count references of cards during inbound transactions (diff)
downloadlinux-604f45167824e18ad5766e51ecf1d4d65f15118d.tar.xz
linux-604f45167824e18ad5766e51ecf1d4d65f15118d.zip
firewire: cdev: freeze FW_CDEV_VERSION due to libraw1394 bug
libraw1394 v2.0.0...v2.0.5 takes FW_CDEV_VERSION from an externally installed header file and uses it to declare its own implementation level in FW_CDEV_IOC_GET_INFO. This is wrong; it should set the real version for which it was actually written. If we add features to the kernel ABI that require the kernel to check a client's implementation level, we can not trust the client version if it was set from FW_CDEV_VERSION. Hence freeze FW_CDEV_VERSION at the current value (no damage has been done yet), clearly document FW_CDEV_VERSION as a dummy version and what clients are expected to do with fw_cdev_get_info.version, and use a new defined constant (which is not placed into the exported header file) as kernel implementation level. Note, in order to check in client program source code which features are present in an externally installed linux/firewire-cdev.h, use preprocessor directives like #ifdef FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE or #ifdef FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED instead of a check of FW_CDEV_VERSION. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/core-cdev.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 8f8c8eeaf046..0cf86bcbeea2 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -46,6 +46,11 @@
#include "core.h"
+/*
+ * ABI version history is documented in linux/firewire-cdev.h.
+ */
+#define FW_CDEV_KERNEL_VERSION 3
+
struct client {
u32 version;
struct fw_device *device;
@@ -395,7 +400,7 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
unsigned long ret = 0;
client->version = a->version;
- a->version = FW_CDEV_VERSION;
+ a->version = FW_CDEV_KERNEL_VERSION;
a->card = client->device->card->index;
down_read(&fw_device_rwsem);