Commit-ID: d29859e7777ebc2c8e2db6e4d8e299f50fc26414 Gitweb: http://git.kernel.org/tip/d29859e7777ebc2c8e2db6e4d8e299f50fc26414 Author: Thomas Gleixner <[email protected]> AuthorDate: Sun, 20 Mar 2016 18:59:03 +0000 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 31 Mar 2016 10:30:37 +0200
x86/perf/intel/cstate: Sanitize error handling There is no point in WARN_ON() inside of a well known init function. We already know the call stack and it's really not of critical importance whether the registration of a PMU fails. Aside of that for consistency reasons it's just pointless to try to register another PMU if the first register attempt failed. There is also no value in keeping one PMU if the second one can not be registered. Make it consistent so we can finaly modularize the driver. Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kan Liang <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: Vince Weaver <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/events/intel/cstate.c | 50 +++++++++++++++++++++++------------------- 1 file changed, 27 insertions(+), 23 deletions(-) diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index 1aac40f..e90ec9e 100644 --- a/arch/x86/events/intel/cstate.c +++ b/arch/x86/events/intel/cstate.c @@ -581,37 +581,45 @@ static int __init cstate_probe(const struct cstate_model *cm) return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV; } -static void __init cstate_cpumask_init(void) +static void __init cstate_cleanup(void) { - int cpu; - - cpu_notifier_register_begin(); - - for_each_online_cpu(cpu) - cstate_cpu_init(cpu); + if (has_cstate_core) + perf_pmu_unregister(&cstate_core_pmu); - __perf_cpu_notifier(cstate_cpu_notifier); - - cpu_notifier_register_done(); + if (has_cstate_pkg) + perf_pmu_unregister(&cstate_pkg_pmu); } -static void __init cstate_pmus_register(void) +static int __init cstate_init(void) { - int err; + int cpu, err; + + cpu_notifier_register_begin(); + for_each_online_cpu(cpu) + cstate_cpu_init(cpu); if (has_cstate_core) { err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1); - if (WARN_ON(err)) - pr_info("Failed to register PMU %s error %d\n", - cstate_core_pmu.name, err); + if (err) { + has_cstate_core = false; + pr_info("Failed to register cstate core pmu\n"); + goto out; + } } if (has_cstate_pkg) { err = perf_pmu_register(&cstate_pkg_pmu, cstate_pkg_pmu.name, -1); - if (WARN_ON(err)) - pr_info("Failed to register PMU %s error %d\n", - cstate_pkg_pmu.name, err); + if (err) { + has_cstate_pkg = false; + pr_info("Failed to register cstate pkg pmu\n"); + cstate_cleanup(); + goto out; + } } + __perf_cpu_notifier(cstate_cpu_notifier); +out: + cpu_notifier_register_done(); + return err; } static int __init cstate_pmu_init(void) @@ -630,10 +638,6 @@ static int __init cstate_pmu_init(void) if (err) return err; - cstate_cpumask_init(); - - cstate_pmus_register(); - - return 0; + return cstate_init(); } device_initcall(cstate_pmu_init);
