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authorJulian Wiedmann <jwi@linux.vnet.ibm.com>2018-03-20 07:59:14 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-31 18:05:44 +0200
commite992c8b81cd08324e3f16fe5c86221f98711d138 (patch)
tree8b11fd2ef475343979fbf1550e9be91b821b7c2f /drivers
parent4b6cd4820c6614b4b6408cc0c45f8a63b85f05f2 (diff)
s390/qeth: lock read device while queueing next buffer
[ Upstream commit 17bf8c9b3d499d5168537c98b61eb7a1fcbca6c2 ] For calling ccw_device_start(), issue_next_read() needs to hold the device's ccwlock. This is satisfied for the IRQ handler path (where qeth_irq() gets called under the ccwlock), but we need explicit locking for the initial call by the MPC initialization. Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/net/qeth_core_main.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index d91a52dacaf5..aec8ba8b9e35 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -526,8 +526,7 @@ static inline int qeth_is_cq(struct qeth_card *card, unsigned int queue)
queue == card->qdio.no_in_queues - 1;
}
-
-static int qeth_issue_next_read(struct qeth_card *card)
+static int __qeth_issue_next_read(struct qeth_card *card)
{
int rc;
struct qeth_cmd_buffer *iob;
@@ -558,6 +557,17 @@ static int qeth_issue_next_read(struct qeth_card *card)
return rc;
}
+static int qeth_issue_next_read(struct qeth_card *card)
+{
+ int ret;
+
+ spin_lock_irq(get_ccwdev_lock(CARD_RDEV(card)));
+ ret = __qeth_issue_next_read(card);
+ spin_unlock_irq(get_ccwdev_lock(CARD_RDEV(card)));
+
+ return ret;
+}
+
static struct qeth_reply *qeth_alloc_reply(struct qeth_card *card)
{
struct qeth_reply *reply;
@@ -1183,7 +1193,7 @@ static void qeth_irq(struct ccw_device *cdev, unsigned long intparm,
return;
if (channel == &card->read &&
channel->state == CH_STATE_UP)
- qeth_issue_next_read(card);
+ __qeth_issue_next_read(card);
iob = channel->iob;
index = channel->buf_no;