[PATCH 5.1 178/405] s390/qeth: handle error from qeth_update_from_chp_desc()

From: Greg Kroah-Hartman
Date: Thu May 30 2019 - 00:45:09 EST


[ Upstream commit a4cdc9baee0740748f16e50cd70c2607510df492 ]

Subsequent code relies on the values that qeth_update_from_chp_desc()
reads from the CHP descriptor. Rather than dealing with weird errors
later on, just handle it properly here.

Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/s390/net/qeth_core_main.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 44bd6f04c145d..8c73a99daff3e 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1308,7 +1308,7 @@ static void qeth_set_multiple_write_queues(struct qeth_card *card)
card->qdio.no_out_queues = 4;
}

-static void qeth_update_from_chp_desc(struct qeth_card *card)
+static int qeth_update_from_chp_desc(struct qeth_card *card)
{
struct ccw_device *ccwdev;
struct channel_path_desc_fmt0 *chp_dsc;
@@ -1318,7 +1318,7 @@ static void qeth_update_from_chp_desc(struct qeth_card *card)
ccwdev = card->data.ccwdev;
chp_dsc = ccw_device_get_chp_desc(ccwdev, 0);
if (!chp_dsc)
- goto out;
+ return -ENOMEM;

card->info.func_level = 0x4100 + chp_dsc->desc;
if (card->info.type == QETH_CARD_TYPE_IQD)
@@ -1333,6 +1333,7 @@ static void qeth_update_from_chp_desc(struct qeth_card *card)
kfree(chp_dsc);
QETH_DBF_TEXT_(SETUP, 2, "nr:%x", card->qdio.no_out_queues);
QETH_DBF_TEXT_(SETUP, 2, "lvl:%02x", card->info.func_level);
+ return 0;
}

static void qeth_init_qdio_info(struct qeth_card *card)
@@ -4986,7 +4987,9 @@ int qeth_core_hardsetup_card(struct qeth_card *card, bool *carrier_ok)

QETH_DBF_TEXT(SETUP, 2, "hrdsetup");
atomic_set(&card->force_alloc_skb, 0);
- qeth_update_from_chp_desc(card);
+ rc = qeth_update_from_chp_desc(card);
+ if (rc)
+ return rc;
retry:
if (retries < 3)
QETH_DBF_MESSAGE(2, "Retrying to do IDX activates on device %x.\n",
@@ -5641,7 +5644,9 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
}

qeth_setup_card(card);
- qeth_update_from_chp_desc(card);
+ rc = qeth_update_from_chp_desc(card);
+ if (rc)
+ goto err_chp_desc;

card->dev = qeth_alloc_netdev(card);
if (!card->dev) {
@@ -5676,6 +5681,7 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
qeth_core_free_discipline(card);
err_load:
free_netdev(card->dev);
+err_chp_desc:
err_card:
qeth_core_free_card(card);
err_dev:
--
2.20.1