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authorJulian Wiedmann <jwi@linux.ibm.com>2019-12-23 15:03:22 +0100
committerDavid S. Miller <davem@davemloft.net>2019-12-24 22:41:06 -0800
commit5b6c7b55cfe26224b0f41b1c226d3534c542787f (patch)
tree3440a4437bf66e84c21bed330d54f2ed7bbce104 /drivers/s390
parent8b5026bc16938920e4780b9094c3bf20e1e0939d (diff)
s390/qeth: lock the card while changing its hsuid
qeth_l3_dev_hsuid_store() initially checks the card state, but doesn't take the conf_mutex to ensure that the card stays in this state while being reconfigured. Rework the code to take this lock, and drop a redundant state check in a helper function. Fixes: b333293058aa ("qeth: add support for af_iucv HiperSockets transport") Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/net/qeth_core_main.c5
-rw-r--r--drivers/s390/net/qeth_l3_sys.c40
2 files changed, 28 insertions, 17 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 324cf22f9111..c64ef55f0dff 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3425,11 +3425,6 @@ int qeth_configure_cq(struct qeth_card *card, enum qeth_cq cq)
goto out;
}
- if (card->state != CARD_STATE_DOWN) {
- rc = -1;
- goto out;
- }
-
qeth_free_qdio_queues(card);
card->options.cq = cq;
rc = 0;
diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index f9067ed6c7d3..e8c848f72c6d 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -242,21 +242,33 @@ static ssize_t qeth_l3_dev_hsuid_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct qeth_card *card = dev_get_drvdata(dev);
+ int rc = 0;
char *tmp;
- int rc;
if (!IS_IQD(card))
return -EPERM;
- if (card->state != CARD_STATE_DOWN)
- return -EPERM;
- if (card->options.sniffer)
- return -EPERM;
- if (card->options.cq == QETH_CQ_NOTAVAILABLE)
- return -EPERM;
+
+ mutex_lock(&card->conf_mutex);
+ if (card->state != CARD_STATE_DOWN) {
+ rc = -EPERM;
+ goto out;
+ }
+
+ if (card->options.sniffer) {
+ rc = -EPERM;
+ goto out;
+ }
+
+ if (card->options.cq == QETH_CQ_NOTAVAILABLE) {
+ rc = -EPERM;
+ goto out;
+ }
tmp = strsep((char **)&buf, "\n");
- if (strlen(tmp) > 8)
- return -EINVAL;
+ if (strlen(tmp) > 8) {
+ rc = -EINVAL;
+ goto out;
+ }
if (card->options.hsuid[0])
/* delete old ip address */
@@ -267,11 +279,13 @@ static ssize_t qeth_l3_dev_hsuid_store(struct device *dev,
card->options.hsuid[0] = '\0';
memcpy(card->dev->perm_addr, card->options.hsuid, 9);
qeth_configure_cq(card, QETH_CQ_DISABLED);
- return count;
+ goto out;
}
- if (qeth_configure_cq(card, QETH_CQ_ENABLED))
- return -EPERM;
+ if (qeth_configure_cq(card, QETH_CQ_ENABLED)) {
+ rc = -EPERM;
+ goto out;
+ }
snprintf(card->options.hsuid, sizeof(card->options.hsuid),
"%-8s", tmp);
@@ -280,6 +294,8 @@ static ssize_t qeth_l3_dev_hsuid_store(struct device *dev,
rc = qeth_l3_modify_hsuid(card, true);
+out:
+ mutex_unlock(&card->conf_mutex);
return rc ? rc : count;
}