[PATCH 4.14 42/43] s390/qeth: lock read device while queueing next buffer

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julian Wiedmann <j...@linux.vnet.ibm.com>


[ 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 <j...@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/s390/net/qeth_core_main.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

--- 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
            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 q
        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 *
                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;