4.14-stable review patch. If anyone has any objections, please let me know.
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From: Julian Wiedmann jwi@linux.ibm.com
[ Upstream commit 70551dc46ffa3555a0b5f3545b0cd87ab67fd002 ]
After the subdriver's remove() routine has completed, the card's layer mode is undetermined again. Reflect this in the layer2 field.
If qeth_dev_layer2_store() hits an error after remove() was called, the card _always_ requires a setup(), even if the previous layer mode is requested again. But qeth_dev_layer2_store() bails out early if the requested layer mode still matches the current one. So unless we reset the layer2 field, re-probing the card back to its previous mode is currently not possible.
Signed-off-by: Julian Wiedmann jwi@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/net/qeth_core_sys.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/s390/net/qeth_core_sys.c +++ b/drivers/s390/net/qeth_core_sys.c @@ -423,6 +423,7 @@ static ssize_t qeth_dev_layer2_store(str if (card->discipline) { card->discipline->remove(card->gdev); qeth_core_free_discipline(card); + card->options.layer2 = -1; }
rc = qeth_core_load_discipline(card, newdis);