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s390/qeth: lock read device while queueing next buffer 

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>
This commit is contained in:
Julian Wiedmann 2018-03-20 07:59:14 +01:00 committed by David S. Miller
parent 1063e432bb
commit 17bf8c9b3d
1 changed files with 13 additions and 3 deletions
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16
drivers/s390/net/qeth_core_main.c
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@ -527,8 +527,7 @@ 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;
@ -559,6 +558,17 @@ 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;
@ -1182,7 +1192,7 @@ 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;