[PATCH] lib: sbi: Fix sbi_pmu_exit() for systems not having MCOUNTINHIBIT csr

[Anup Patel]

The sbi_pmu_exit() crashes on systems not having MCOUNTINHIBIT csr
so to fix this we check SBI_HART_HAS_MCOUNTINHIBIT feature in
sbi_pmu_exit() and do nothing if it is not available.

Fixes: 13d40f21d588 ("lib: sbi: Add PMU support")
Signed-off-by: Anup Patel <anup.patel at wdc.com>
---
 lib/sbi/sbi_pmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c
index 4092e6f..c276a46 100644
--- a/lib/sbi/sbi_pmu.c
+++ b/lib/sbi/sbi_pmu.c
@@ -583,6 +583,10 @@ void sbi_pmu_exit(struct sbi_scratch *scratch)
 {
 	u32 hartid = current_hartid();
 
+	/* SBI PMU is not supported if mcountinhibit is not available */
+	if (!sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT))
+		return;
+
 	csr_write(CSR_MCOUNTINHIBIT, 0xFFFFFFF8);
 	csr_write(CSR_MCOUNTEREN, 7);
 	pmu_reset_event_map(hartid);
-- 
2.25.1