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Commit ee2db684 authored by Frank Blaschka's avatar Frank Blaschka Committed by Jeff Garzik
Browse files

s390: qeth driver fixes: atomic context fixups 



    - qeth device functions were not callable
      in atomic context due to usage of wait_event_xxx operations in qeth.
      "schedule while atomic" message appeared and kernel dumped when
      removing slave from bond device.

Signed-off-by: default avatarFrank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 2d36c16e

drivers/s390/net/qeth.h

+1 −1
Original line number Diff line number Diff line
@@ -710,7 +710,7 @@ struct qeth_reply { 
	int (*callback)(struct qeth_card *,struct qeth_reply *,unsigned long);

 	u32 seqno;

	unsigned long offset;

	int received;

	atomic_t received;

	int rc;

	void *param;

	struct qeth_card *card;

drivers/s390/net/qeth_main.c

+29 −96
Original line number Diff line number Diff line
@@ -471,7 +471,7 @@ qeth_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 
	    channel->state == CH_STATE_UP)

		qeth_issue_next_read(card);



	tasklet_schedule(&channel->irq_tasklet);

	qeth_irq_tasklet((unsigned long)channel);

	return;

out:

	wake_up(&card->wait_q);
@@ -950,40 +950,6 @@ qeth_do_run_thread(struct qeth_card *card, unsigned long thread) 
	return rc;

}



static int

qeth_register_ip_addresses(void *ptr)

{

	struct qeth_card *card;



	card = (struct qeth_card *) ptr;

	daemonize("qeth_reg_ip");

	QETH_DBF_TEXT(trace,4,"regipth1");

	if (!qeth_do_run_thread(card, QETH_SET_IP_THREAD))

		return 0;

	QETH_DBF_TEXT(trace,4,"regipth2");

	qeth_set_ip_addr_list(card);

	qeth_clear_thread_running_bit(card, QETH_SET_IP_THREAD);

	return 0;

}



/*

 * Drive the SET_PROMISC_MODE thread

 */

static int

qeth_set_promisc_mode(void *ptr)

{

	struct qeth_card *card = (struct qeth_card *) ptr;



	daemonize("qeth_setprm");

	QETH_DBF_TEXT(trace,4,"setprm1");

	if (!qeth_do_run_thread(card, QETH_SET_PROMISC_MODE_THREAD))

		return 0;

	QETH_DBF_TEXT(trace,4,"setprm2");

	qeth_setadp_promisc_mode(card);

	qeth_clear_thread_running_bit(card, QETH_SET_PROMISC_MODE_THREAD);

	return 0;

}



static int

qeth_recover(void *ptr)

{
@@ -1047,11 +1013,6 @@ qeth_start_kernel_thread(struct work_struct *work) 
	if (card->read.state != CH_STATE_UP &&

	    card->write.state != CH_STATE_UP)

		return;



	if (qeth_do_start_thread(card, QETH_SET_IP_THREAD))

		kernel_thread(qeth_register_ip_addresses, (void *)card,SIGCHLD);

	if (qeth_do_start_thread(card, QETH_SET_PROMISC_MODE_THREAD))

		kernel_thread(qeth_set_promisc_mode, (void *)card, SIGCHLD);

	if (qeth_do_start_thread(card, QETH_RECOVER_THREAD))

		kernel_thread(qeth_recover, (void *) card, SIGCHLD);

}
@@ -1613,8 +1574,6 @@ qeth_issue_next_read(struct qeth_card *card) 
		return -ENOMEM;

	}

	qeth_setup_ccw(&card->read, iob->data, QETH_BUFSIZE);

	wait_event(card->wait_q,

		   atomic_cmpxchg(&card->read.irq_pending, 0, 1) == 0);

	QETH_DBF_TEXT(trace, 6, "noirqpnd");

	rc = ccw_device_start(card->read.ccwdev, &card->read.ccw,

			      (addr_t) iob, 0, 0);
@@ -1635,6 +1594,7 @@ qeth_alloc_reply(struct qeth_card *card) 
	reply = kzalloc(sizeof(struct qeth_reply), GFP_ATOMIC);

	if (reply){

		atomic_set(&reply->refcnt, 1);

		atomic_set(&reply->received, 0);

		reply->card = card;

	};

	return reply;
@@ -1655,31 +1615,6 @@ qeth_put_reply(struct qeth_reply *reply) 
		kfree(reply);

}



static void

qeth_cmd_timeout(unsigned long data)

{

	struct qeth_reply *reply, *list_reply, *r;

	unsigned long flags;



	reply = (struct qeth_reply *) data;

	spin_lock_irqsave(&reply->card->lock, flags);

	list_for_each_entry_safe(list_reply, r,

				 &reply->card->cmd_waiter_list, list) {

		if (reply == list_reply){

			qeth_get_reply(reply);

			list_del_init(&reply->list);

			spin_unlock_irqrestore(&reply->card->lock, flags);

			reply->rc = -ETIME;

			reply->received = 1;

			wake_up(&reply->wait_q);

			qeth_put_reply(reply);

			return;

		}

	}

	spin_unlock_irqrestore(&reply->card->lock, flags);

}





static struct qeth_ipa_cmd *

qeth_check_ipa_data(struct qeth_card *card, struct qeth_cmd_buffer *iob)

{
@@ -1745,7 +1680,7 @@ qeth_clear_ipacmd_list(struct qeth_card *card) 
	list_for_each_entry_safe(reply, r, &card->cmd_waiter_list, list) {

		qeth_get_reply(reply);

		reply->rc = -EIO;

		reply->received = 1;

		atomic_inc(&reply->received);

		list_del_init(&reply->list);

		wake_up(&reply->wait_q);

		qeth_put_reply(reply);
@@ -1814,7 +1749,7 @@ qeth_send_control_data_cb(struct qeth_channel *channel, 
					      &card->cmd_waiter_list);

				spin_unlock_irqrestore(&card->lock, flags);

			} else {

				reply->received = 1;

				atomic_inc(&reply->received);

				wake_up(&reply->wait_q);

			}

			qeth_put_reply(reply);
@@ -1858,7 +1793,7 @@ qeth_send_control_data(struct qeth_card *card, int len, 
	int rc;

	unsigned long flags;

	struct qeth_reply *reply = NULL;

	struct timer_list timer;

	unsigned long timeout;



	QETH_DBF_TEXT(trace, 2, "sendctl");
@@ -1873,21 +1808,20 @@ qeth_send_control_data(struct qeth_card *card, int len, 
		reply->seqno = QETH_IDX_COMMAND_SEQNO;

	else

		reply->seqno = card->seqno.ipa++;

	init_timer(&timer);

	timer.function = qeth_cmd_timeout;

	timer.data = (unsigned long) reply;

	init_waitqueue_head(&reply->wait_q);

	spin_lock_irqsave(&card->lock, flags);

	list_add_tail(&reply->list, &card->cmd_waiter_list);

	spin_unlock_irqrestore(&card->lock, flags);

	QETH_DBF_HEX(control, 2, iob->data, QETH_DBF_CONTROL_LEN);

	wait_event(card->wait_q,

		   atomic_cmpxchg(&card->write.irq_pending, 0, 1) == 0);



	while (atomic_cmpxchg(&card->write.irq_pending, 0, 1)) ;

	qeth_prepare_control_data(card, len, iob);



	if (IS_IPA(iob->data))

		timer.expires = jiffies + QETH_IPA_TIMEOUT;

		timeout = jiffies + QETH_IPA_TIMEOUT;

	else

		timer.expires = jiffies + QETH_TIMEOUT;

		timeout = jiffies + QETH_TIMEOUT;



	QETH_DBF_TEXT(trace, 6, "noirqpnd");

	spin_lock_irqsave(get_ccwdev_lock(card->write.ccwdev), flags);

	rc = ccw_device_start(card->write.ccwdev, &card->write.ccw,
@@ -1906,9 +1840,16 @@ qeth_send_control_data(struct qeth_card *card, int len, 
		wake_up(&card->wait_q);

		return rc;

	}

	add_timer(&timer);

	wait_event(reply->wait_q, reply->received);

	del_timer_sync(&timer);

	while (!atomic_read(&reply->received)) {

		if (time_after(jiffies, timeout)) {

			spin_lock_irqsave(&reply->card->lock, flags);

			list_del_init(&reply->list);

			spin_unlock_irqrestore(&reply->card->lock, flags);

			reply->rc = -ETIME;

			atomic_inc(&reply->received);

			wake_up(&reply->wait_q);

		}

	};

	rc = reply->rc;

	qeth_put_reply(reply);

	return rc;
@@ -5541,12 +5482,10 @@ qeth_set_multicast_list(struct net_device *dev) 
	qeth_add_multicast_ipv6(card);

#endif

out:

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

	if (!qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE))

		return;

	if (qeth_set_thread_start_bit(card, QETH_SET_PROMISC_MODE_THREAD)==0)

		schedule_work(&card->kernel_thread_starter);

	qeth_setadp_promisc_mode(card);

}



static int
@@ -8271,8 +8210,7 @@ qeth_add_vipa(struct qeth_card *card, enum qeth_prot_versions proto, 
	}

	if (!qeth_add_ip(card, ipaddr))

		kfree(ipaddr);

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

	return rc;

}
@@ -8300,8 +8238,7 @@ qeth_del_vipa(struct qeth_card *card, enum qeth_prot_versions proto, 
		return;

	if (!qeth_delete_ip(card, ipaddr))

		kfree(ipaddr);

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

}



/*
@@ -8344,8 +8281,7 @@ qeth_add_rxip(struct qeth_card *card, enum qeth_prot_versions proto, 
	}

	if (!qeth_add_ip(card, ipaddr))

		kfree(ipaddr);

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

	return 0;

}
@@ -8373,8 +8309,7 @@ qeth_del_rxip(struct qeth_card *card, enum qeth_prot_versions proto, 
		return;

	if (!qeth_delete_ip(card, ipaddr))

		kfree(ipaddr);

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

}



/**
@@ -8416,8 +8351,7 @@ qeth_ip_event(struct notifier_block *this, 
	default:

		break;

	}

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

out:

	return NOTIFY_DONE;

}
@@ -8469,8 +8403,7 @@ qeth_ip6_event(struct notifier_block *this, 
	default:

		break;

	}

 	if (qeth_set_thread_start_bit(card, QETH_SET_IP_THREAD) == 0)

		schedule_work(&card->kernel_thread_starter);

	qeth_set_ip_addr_list(card);

out:

	return NOTIFY_DONE;

}