From: Alexander Shishkin alexander.shishkin@linux.intel.com
mainline inclusion from mainline-v5.4-rc7 commit e5a340f770278f4de42e8bac19f2ebeb77ddfae4 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA
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Commit 615c164da0eb ("intel_th: msu: Introduce buffer interface") added a mutex that it forgot to initialize, resulting in a lockdep splat.
Fix that by initializing the mutex statically.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Fixes: 615c164da0eb ("intel_th: msu: Introduce buffer interface") Link: https://lore.kernel.org/r/20191028070651.9770-3-alexander.shishkin@linux.int... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hwtracing/intel_th/msu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c index 358ef3f900100..48b65a2663128 100644 --- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -162,7 +162,7 @@ struct msc { };
static LIST_HEAD(msu_buffer_list); -static struct mutex msu_buffer_mutex; +static DEFINE_MUTEX(msu_buffer_mutex);
/** * struct msu_buffer_entry - internal MSU buffer bookkeeping