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s390/qeth: Fix vnicc_is_in_use if rx_bcast not set 

commit e8a66d8004 upstream.

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: caa1f0b10d ("s390/qeth: add VNICC enable/disable support")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandra Winter 2019-12-23 15:03:24 +01:00 committed by Greg Kroah-Hartman
parent efc8a5d619
commit 982d97388e
1 changed files with 1 additions and 2 deletions
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3
drivers/s390/net/qeth_l2_main.c
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@ -1983,8 +1983,7 @@ 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.