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From:   Sasha Levin <sashal@kernel.org>
To:     stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Thomas Richter <tmricht@linux.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.19 44/73] s390/perf: Change CPUM_CF return code in event init function
Date:   Wed, 14 Nov 2018 17:21:38 -0500
Message-Id: <20181114222207.98701-44-sashal@kernel.org>
In-Reply-To: <20181114222207.98701-1-sashal@kernel.org>
References: <20181114222207.98701-1-sashal@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Thomas Richter <tmricht@linux.ibm.com>

[ Upstream commit 0bb2ae1b26e1fb7543ec7474cdd374ac4b88c4da ]

The function perf_init_event() creates a new event and
assignes it to a PMU. This a done in a loop over all existing
PMUs. For each listed PMU the event init function is called
and if this function does return any other error than -ENOENT,
the loop is terminated the creation of the event fails.

If the event is invalid, return -ENOENT to try other PMUs.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/s390/kernel/perf_cpum_cf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index cc085e2d2ce9..74091fd3101e 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -373,7 +373,7 @@ static int __hw_perf_event_init(struct perf_event *event)
 		return -ENOENT;
 
 	if (ev > PERF_CPUM_CF_MAX_CTR)
-		return -EINVAL;
+		return -ENOENT;
 
 	/* Obtain the counter set to which the specified counter belongs */
 	set = get_counter_set(ev);
-- 
2.17.1