securemsm-kernel: smmu-proxy: Fix CSF version caching code

We're not caching the CSF version despite intending to - fix this.

Change-Id: Iaf95c39eb0c3cade36a4c12454bb12fcd7becc74
Signed-off-by: Chris Goldsworthy <[email protected]>

smmu-proxy/qti-smmu-proxy-common.c

@@ -23,6 +23,7 @@ int smmu_proxy_get_csf_version(struct csf_version *csf_version)
 	struct Object client_env = {0};
 	struct Object sc_object;
 
+	/* Assumption is that cached_csf_version.arch_ver !=0 ==> other vals are set */
 	if (cached_csf_version.arch_ver != 0) {
 		csf_version->arch_ver = cached_csf_version.arch_ver;
 		csf_version->max_ver = cached_csf_version.max_ver;
@@ -52,6 +53,14 @@ int smmu_proxy_get_csf_version(struct csf_version *csf_version)
 	Object_release(sc_object);
 	Object_release(client_env);
 
+	/*
+	 * Once we set cached_csf_version.arch_ver, concurrent callers will get
+	 * the cached value.
+	 */
+	cached_csf_version.min_ver = csf_version->min_ver;
+	cached_csf_version.max_ver = csf_version->max_ver;
+	cached_csf_version.arch_ver = csf_version->arch_ver;
+
 	return ret;
 }
 EXPORT_SYMBOL(smmu_proxy_get_csf_version);