linux-kernel - [PATCH AUTOSEL 4.19 06/11] s390/qeth: Fix vnicc_is_in_use if rx

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Message-Id: <20200110220556.28505-5-sashal@kernel.org>
Date:   Fri, 10 Jan 2020 17:05:50 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alexandra Winter <wintera@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, linux-s390@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 06/11] s390/qeth: Fix vnicc_is_in_use if rx_bcast not set

From: Alexandra Winter <wintera@...ux.ibm.com>

[ Upstream commit e8a66d800471e2df7f0b484e2e46898b21d1fa82 ]

Symptom: After vnicc/rx_bcast has been manually set to 0,
	bridge_* sysfs parameters can still be set or written.
Only occurs on HiperSockets, as OSA doesn't support changing rx_bcast.

Vnic characteristics and bridgeport settings are mutually exclusive.
rx_bcast defaults to 1, so manually setting it to 0 should disable
bridge_* parameters.

Instead it makes sense here to check the supported mask. If the card
does not support vnicc at all, bridge commands are always allowed.

Fixes: caa1f0b10d18 ("s390/qeth: add VNICC enable/disable support")
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/s390/net/qeth_l2_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 66bc6f1ffd34..c238b190b3c9 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2285,8 +2285,7 @@ int qeth_l2_vnicc_get_timeout(struct qeth_card *card, u32 *timeout)
 /* check if VNICC is currently enabled */
 bool qeth_l2_vnicc_is_in_use(struct qeth_card *card)
 {
-	/* if everything is turned off, VNICC is not active */
-	if (!card->options.vnicc.cur_chars)
+	if (!card->options.vnicc.sup_chars)
 		return false;
 	/* default values are only OK if rx_bcast was not enabled by user
 	 * or the card is offline.
-- 
2.20.1