From: Zongmin Zhou <zhouzongmin@kylinos.cn>
try_count is initialized to 5 but never decremented in the retry path,
making the `if (try_count)` check always true. If all NACL shared memory
hfence entries remain in the pending state after sync, the function loops
forever, causing a soft lockup. Decrement try_count on each retry so the
fallback warning and return become reachable.
Fixes: d466c19cead5 ("RISC-V: KVM: Add common nested acceleration support")
Signed-off-by: Zongmin Zhou <zhouzongmin@kylinos.cn>
---
arch/riscv/kvm/nacl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/kvm/nacl.c b/arch/riscv/kvm/nacl.c
index 6f9f8963e9dd..9aff03c4f667 100644
--- a/arch/riscv/kvm/nacl.c
+++ b/arch/riscv/kvm/nacl.c
@@ -33,7 +33,7 @@ void __kvm_riscv_nacl_hfence(void *shmem,
}
if (ent < 0) {
- if (try_count) {
+ if (try_count--) {
nacl_sync_hfence(-1UL);
goto again;
} else {
--
2.34.1
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