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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-07-07 14:13:14 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-07-13 09:47:47 +0200 |
| commit | eb5b35a560510efc6bb62f05c3c82e9596cdfafe (patch) | |
| tree | 59d610352e8e0e60de0ce958149fb08dddf6ce82 /drivers/firewire/core-cdev.c | |
| parent | 656b7afd40a9f2b0d6cf8ef1972681961b428558 (diff) | |
| download | lwn-eb5b35a560510efc6bb62f05c3c82e9596cdfafe.tar.gz lwn-eb5b35a560510efc6bb62f05c3c82e9596cdfafe.zip | |
firewire: core: ensure some userspace API constants match corresponding kernel API constants
The FW_ISO_ constants of the in-kernel API of firewire-core and
FW_CDEV_ISO_ constants of the userspace API of firewire-core have
nothing to do with each other --- except that the core-cdev.c
implementation relies on them having the same values.
Hence put some compile-time assertions into core-cdev.c. It's lame but
I prefer it over including the userspace API header into the kernelspace
API header and defining kernelspace API constants from userspace API
constants. Nor do I want to expose the kernelspace constants in one of
the two firewire headers that are exported to userland since this only
concerns the core-cdev.c implementation.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core-cdev.c')
| -rw-r--r-- | drivers/firewire/core-cdev.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index f7559bfeaba3..7a690c466ce9 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -18,6 +18,7 @@ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <linux/bug.h> #include <linux/compat.h> #include <linux/delay.h> #include <linux/device.h> @@ -909,6 +910,9 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) struct fw_cdev_create_iso_context *a = &arg->create_iso_context; struct fw_iso_context *context; + BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || + FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE); + if (a->channel > 63) return -EINVAL; @@ -1060,6 +1064,13 @@ static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) { struct fw_cdev_start_iso *a = &arg->start_iso; + BUILD_BUG_ON( + FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || + FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); + if (client->iso_context == NULL || a->handle != 0) return -EINVAL; |