This adds a message lock to the smu_send_smc_msg* implementations to
protect against concurrent access to the mmu registers used to
communicate with the SMU
---
drivers/gpu/drm/amd/powerplay/smu_v11_0.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index 220bf0b10971..19bebba3e0a4 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -102,11 +102,12 @@ smu_v11_0_send_msg_with_param(struct smu_context *smu,
if (index < 0)
return index;
+ mutex_lock(&smu->message_lock);
ret = smu_v11_0_wait_for_response(smu);
if (ret) {
pr_err("Msg issuing pre-check failed and "
"SMU may be not in the right state!\n");
- return ret;
+ goto out;
}
WREG32_SOC15(MP1, 0, mmMP1_SMN_C2PMSG_90, 0);
@@ -119,18 +120,19 @@ smu_v11_0_send_msg_with_param(struct smu_context *smu,
if (ret) {
pr_err("failed send message: %10s (%d) \tparam: 0x%08x response
%#x\n",
smu_get_message_name(smu, msg), index, param, ret);
- return ret;
+ goto out;
}
if (read_arg) {
ret = smu_v11_0_read_arg(smu, read_arg);
if (ret) {
pr_err("failed to read message arg: %10s (%d) \tparam:
0x%08x response %#x\n",
smu_get_message_name(smu, msg), index, param,
ret);
- return ret;
+ goto out;
}
}
-
- return 0;
+out:
+ mutex_unlock(&smu->message_lock);
+ return ret;
}
int smu_v11_0_init_microcode(struct smu_context *smu)
--
2.25.0
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