[RFC 07/12] powerpc/pseries: Annotate the RTAS physical-attestation sequence lock context

["Ritesh Harjani (IBM)" <ritesh.list@gmail.com>]

Clang's context analysis reports:
  papr-phy-attest.c:154:1: error: mutex 'rtas_ibm_physical_attestation_lock' is still held at the end of function [-Werror,-Wthread-safety-analysis]
  papr-phy-attest.c:169:2: error: releasing mutex 'rtas_ibm_physical_attestation_lock' that was not held [-Werror,-Wthread-safety-analysis]

Add the necessary annotations to phy_attest_sequence_{begin|end}(),
to fix these errors for enabling Clang context analysis.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
 arch/powerpc/platforms/pseries/papr-phy-attest.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/papr-phy-attest.c b/arch/powerpc/platforms/pseries/papr-phy-attest.c
index 350ba26e5962..d2bc5c0da422 100644
--- a/arch/powerpc/platforms/pseries/papr-phy-attest.c
+++ b/arch/powerpc/platforms/pseries/papr-phy-attest.c
@@ -133,8 +133,11 @@ static int rtas_physical_attestation(struct rtas_phy_attest_params *params)
  * @seq: user specified parameters for RTAS call from seq struct.
  *
  * Context: May sleep.
+ * Returns with rtas_ibm_physical_attestation_lock held.
+ * phy_attest_sequence_end() releases it.
  */
 static void phy_attest_sequence_begin(struct papr_rtas_sequence *seq)
+		__acquires(&rtas_ibm_physical_attestation_lock)
 {
 	struct rtas_phy_attest_params *param;
 
@@ -161,6 +164,7 @@ static void phy_attest_sequence_begin(struct papr_rtas_sequence *seq)
  * Releases resources obtained by phy_attest_sequence_begin().
  */
 static void phy_attest_sequence_end(struct papr_rtas_sequence *seq)
+		__releases(&rtas_ibm_physical_attestation_lock)
 {
 	struct rtas_phy_attest_params *param;
 
-- 
2.39.5