Am 20.12.2014 um 21:46 schrieb Oded Gabbay:
When amdkfd and radeon are compiled inside the kernel image (not as modules),
radeon will load before amdkfd and will set *kfd2kgd to its interface
structure. Therefore, we must not set *kfd2kgd to NULL when amdkfd is loaded
because it will override radeon's initialization and cause kernel BUG.
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxx>
You should probably rather fix the dependency between the two modules to
get an determined load order instead of doing such nasty workarounds.
Christian.
---
drivers/gpu/drm/amd/amdkfd/kfd_module.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
index 95d5af1..236562f 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
@@ -34,7 +34,7 @@
#define KFD_DRIVER_MINOR 7
#define KFD_DRIVER_PATCHLEVEL 0
-const struct kfd2kgd_calls *kfd2kgd;
+const struct kfd2kgd_calls *kfd2kgd = NULL;
static const struct kgd2kfd_calls kgd2kfd = {
.exit = kgd2kfd_exit,
.probe = kgd2kfd_probe,
@@ -84,14 +84,13 @@ EXPORT_SYMBOL(kgd2kfd_init);
void kgd2kfd_exit(void)
{
+ kfd2kgd = NULL;
}
static int __init kfd_module_init(void)
{
int err;
- kfd2kgd = NULL;
-
/* Verify module parameters */
if ((sched_policy < KFD_SCHED_POLICY_HWS) ||
(sched_policy > KFD_SCHED_POLICY_NO_HWS)) {
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