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

[Ritesh Harjani (IBM)]

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.l...@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