[RFC 05/12] powerpc/pseries: Annotate the VPD sequence lock context

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

Clang's context analysis reports:
  papr-vpd.c:151:1: error: mutex 'rtas_ibm_get_vpd_lock' is still held at the end of function [-Werror,-Wthread-safety-analysis]
  papr-vpd.c:165:2: error: releasing mutex 'rtas_ibm_get_vpd_lock' that was not held [-Werror,-Wthread-safety-analysis]

Add the necessary annotations to in vpd_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-vpd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/papr-vpd.c b/arch/powerpc/platforms/pseries/papr-vpd.c
index f38c188fc4a1..8d210454cff1 100644
--- a/arch/powerpc/platforms/pseries/papr-vpd.c
+++ b/arch/powerpc/platforms/pseries/papr-vpd.c
@@ -123,8 +123,10 @@ static int rtas_ibm_get_vpd(struct rtas_ibm_get_vpd_params *params)
  * @seq: vpd call parameters from sequence struct
  *
  * Context: May sleep.
+ * Returns with rtas_ibm_get_vpd_lock held. vpd_sequence_end() releases it.
  */
 static void vpd_sequence_begin(struct papr_rtas_sequence *seq)
+		__acquires(&rtas_ibm_get_vpd_lock)
 {
 	struct rtas_ibm_get_vpd_params *vpd_params;
 	/*
@@ -157,6 +159,7 @@ static void vpd_sequence_begin(struct papr_rtas_sequence *seq)
  * Releases resources obtained by vpd_sequence_begin().
  */
 static void vpd_sequence_end(struct papr_rtas_sequence *seq)
+		__releases(&rtas_ibm_get_vpd_lock)
 {
 	struct rtas_ibm_get_vpd_params *vpd_params;
 
-- 
2.39.5