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s390/qeth: unify the tracking of active cmds on ccw device

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We have one field to track _whether_ a cmd is active on a ccw device
('irq_pending'), and one to track _which_ cmd it is ('active_cmd').

Get rid of the irq_pending field, by testing active_cmd for NULL.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2021-06-11 09:33:35 +02:00 committed by David S. Miller
parent 7a4b92e8e0
commit 3518ae76f2
2 changed files with 11 additions and 15 deletions
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14
drivers/s390/net/qeth_core.h
View file

@ -614,7 +614,6 @@ struct qeth_channel {
struct ccw_device *ccwdev;
struct qeth_cmd_buffer *active_cmd;
enum qeth_channel_states state;
atomic_t irq_pending;
};
struct qeth_reply {
@ -664,11 +663,6 @@ static inline struct ccw1 *__ccw_from_cmd(struct qeth_cmd_buffer *iob)
return (struct ccw1 *)(iob->data + ALIGN(iob->length, 8));
}
static inline bool qeth_trylock_channel(struct qeth_channel *channel)
{
return atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0;
}
/**
* OSA card related definitions
*/
@ -896,10 +890,16 @@ static inline bool qeth_use_tx_irqs(struct qeth_card *card)
static inline void qeth_unlock_channel(struct qeth_card *card,
struct qeth_channel *channel)
{
atomic_set(&channel->irq_pending, 0);
xchg(&channel->active_cmd, NULL);
wake_up(&card->wait_q);
}
static inline bool qeth_trylock_channel(struct qeth_channel *channel,
struct qeth_cmd_buffer *cmd)
{
return cmpxchg(&channel->active_cmd, NULL, cmd) == NULL;
}
struct qeth_trap_id {
__u16 lparnr;
char vmname[8];

12
drivers/s390/net/qeth_core_main.c
View file

@ -1268,7 +1268,6 @@ static void qeth_irq(struct ccw_device *cdev, unsigned long intparm,
iob = (struct qeth_cmd_buffer *) (addr_t)intparm;
}
channel->active_cmd = NULL;
qeth_unlock_channel(card, channel);
rc = qeth_check_irb_error(card, cdev, irb);
@ -1715,11 +1714,10 @@ static int qeth_stop_channel(struct qeth_channel *channel)
rc = ccw_device_set_offline(cdev);
spin_lock_irq(get_ccwdev_lock(cdev));
if (channel->active_cmd) {
if (channel->active_cmd)
dev_err(&cdev->dev, "Stopped channel while cmd %px was still active\n",
channel->active_cmd);
channel->active_cmd = NULL;
}
cdev->handler = NULL;
spin_unlock_irq(get_ccwdev_lock(cdev));
@ -1732,7 +1730,7 @@ static int qeth_start_channel(struct qeth_channel *channel)
int rc;
channel->state = CH_STATE_DOWN;
atomic_set(&channel->irq_pending, 0);
xchg(&channel->active_cmd, NULL);
spin_lock_irq(get_ccwdev_lock(cdev));
cdev->handler = qeth_irq;
@ -2039,7 +2037,7 @@ static int qeth_send_control_data(struct qeth_card *card,
reply->param = reply_param;
timeout = wait_event_interruptible_timeout(card->wait_q,
qeth_trylock_channel(channel),
qeth_trylock_channel(channel, iob),
timeout);
if (timeout <= 0) {
qeth_put_cmd(iob);
@ -2059,8 +2057,6 @@ static int qeth_send_control_data(struct qeth_card *card,
spin_lock_irq(get_ccwdev_lock(channel->ccwdev));
rc = ccw_device_start_timeout(channel->ccwdev, __ccw_from_cmd(iob),
(addr_t) iob, 0, 0, timeout);
if (!rc)
channel->active_cmd = iob;
spin_unlock_irq(get_ccwdev_lock(channel->ccwdev));
if (rc) {
QETH_DBF_MESSAGE(2, "qeth_send_control_data on device %x: ccw_device_start rc = %i\n",