linux-kernel - [PATCH 1/2] xen: correct error handling in xen-acpi-processor

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Message-Id: <20170331111948.17539-2-jgross@suse.com>
Date:   Fri, 31 Mar 2017 13:19:47 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        Juergen Gross <jgross@...e.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] xen: correct error handling in xen-acpi-processor

Error handling in upload_pm_data() is rather questionable: possible
errno values from called functions are or'ed together resulting in
strange return values: -EINVAL and -ENOMEM would e.g. result in
returning -EXDEV.

Fix this by bailing out early after the first error.

Cc: stable@...r.kernel.org
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 drivers/xen/xen-acpi-processor.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 23e391d..3659ed3 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -283,8 +283,8 @@ static int upload_pm_data(struct acpi_processor *_pr)
 	if (_pr->flags.power)
 		err = push_cxx_to_hypervisor(_pr);
 
-	if (_pr->performance && _pr->performance->states)
-		err |= push_pxx_to_hypervisor(_pr);
+	if (!err && _pr->performance && _pr->performance->states)
+		err = push_pxx_to_hypervisor(_pr);
 
 	mutex_unlock(&acpi_ids_mutex);
 	return err;
-- 
2.10.2