From 41cad8284d5e6bf1d49d3c10a6b52ee1ae866a20 Mon Sep 17 00:00:00 2001 From: Andrew Jones Date: Thu, 27 Apr 2023 18:36:26 +0200 Subject: RISC-V: Align SBI probe implementation with spec sbi_probe_extension() is specified with "Returns 0 if the given SBI extension ID (EID) is not available, or 1 if it is available unless defined as any other non-zero value by the implementation." Additionally, sbiret.value is a long. Fix the implementation to ensure any nonzero long value is considered a success, rather than only positive int values. Fixes: b9dcd9e41587 ("RISC-V: Add basic support for SBI v0.2") Signed-off-by: Andrew Jones Reviewed-by: Conor Dooley Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230427163626.101042-1-ajones@ventanamicro.com Signed-off-by: Palmer Dabbelt --- drivers/perf/riscv_pmu_sbi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/perf') diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 70cb50fd41c2..4f3ac296b3e2 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -924,7 +924,7 @@ static int __init pmu_sbi_devinit(void) struct platform_device *pdev; if (sbi_spec_version < sbi_mk_version(0, 3) || - sbi_probe_extension(SBI_EXT_PMU) <= 0) { + !sbi_probe_extension(SBI_EXT_PMU)) { return 0; } -- cgit v1.2.3