[RFC 06/12] powerpc/pseries: Annotate the RTAS indices sequence lock context

[Ritesh Harjani (IBM)]

Clang's context analysis reports:
  papr-indices.c:145:1: error: mutex 'rtas_ibm_get_indices_lock' is still held 
at the end of function [-Werror,-Wthread-safety-analysis]
  papr-indices.c:158:2: error: releasing mutex 'rtas_ibm_get_indices_lock' that 
was not held [-Werror,-Wthread-safety-analysis]

Add the necessary annotations to indices_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-indices.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/papr-indices.c 
b/arch/powerpc/platforms/pseries/papr-indices.c
index 3c7545591c45..3f3b88f708a3 100644
--- a/arch/powerpc/platforms/pseries/papr-indices.c
+++ b/arch/powerpc/platforms/pseries/papr-indices.c
@@ -126,8 +126,10 @@ static int rtas_ibm_get_indices(struct 
rtas_get_indices_params *params)
  * indices_sequence_begin() - Begin a indices retrieval sequence.
  *
  * Context: May sleep.
+ * Returns with rtas_ibm_get_indices_lock held. indices_sequence_end() 
releases it.
  */
 static void indices_sequence_begin(struct papr_rtas_sequence *seq)
+               __acquires(&rtas_ibm_get_indices_lock)
 {
        struct rtas_get_indices_params  *param;
 
@@ -150,6 +152,7 @@ static void indices_sequence_begin(struct 
papr_rtas_sequence *seq)
  * Releases resources obtained by indices_sequence_begin().
  */
 static void indices_sequence_end(struct papr_rtas_sequence *seq)
+               __releases(&rtas_ibm_get_indices_lock)
 {
        struct rtas_get_indices_params *param;
 
-- 
2.39.5