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[PATCH] s390: set online race in the lcs driver
[patch 3/10] s390: set online race in the lcs driver. From: Michael Holzheu <holzheu@de.ibm.com> There is a race between lcs_stopcard() and lcs_open_device() which can lead to the error 'lcs: Error in starting channel, rc=-16'. lcs_open_device() is invoked when 'ifconfig up' is called due to a hotplug event, which is caused by register_netdev(). In parallel lcs_stopcard() is executed. Both functions are sending lcs commands. The second invocation fails with -EBUSY (-16) as return value. Move invocation of register_netdev() after invocation of lcs_stopcard to avoid the race. Signed-off-by: Frank Pavlic <pavlic@de.ibm.com>
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@ -11,7 +11,7 @@
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* Frank Pavlic (pavlic@de.ibm.com) and
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*
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* $Revision: 1.97 $ $Date: 2005/03/31 09:42:02 $
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* $Revision: 1.98 $ $Date: 2005/04/18 13:41:29 $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -59,7 +59,7 @@
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/**
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* initialization string for output
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*/
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#define VERSION_LCS_C "$Revision: 1.97 $"
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#define VERSION_LCS_C "$Revision: 1.98 $"
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static char version[] __initdata = "LCS driver ("VERSION_LCS_C "/" VERSION_LCS_H ")";
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static char debug_buffer[255];
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@ -1098,14 +1098,6 @@ lcs_check_multicast_support(struct lcs_card *card)
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PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
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return -EOPNOTSUPP;
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}
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/* Print out supported assists: IPv6 */
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PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
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(card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
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"with" : "without");
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/* Print out supported assist: Multicast */
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PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
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(card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
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"with" : "without");
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if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
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return 0;
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return -EOPNOTSUPP;
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@ -2198,30 +2190,39 @@ lcs_new_device(struct ccwgroup_device *ccwgdev)
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if (!dev)
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goto out;
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card->dev = dev;
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netdev_out:
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card->dev->priv = card;
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card->dev->open = lcs_open_device;
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card->dev->stop = lcs_stop_device;
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card->dev->hard_start_xmit = lcs_start_xmit;
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card->dev->get_stats = lcs_getstats;
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SET_MODULE_OWNER(dev);
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if (lcs_register_netdev(ccwgdev) != 0)
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goto out;
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memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
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#ifdef CONFIG_IP_MULTICAST
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if (!lcs_check_multicast_support(card))
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card->dev->set_multicast_list = lcs_set_multicast_list;
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#endif
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netif_stop_queue(card->dev);
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netdev_out:
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lcs_set_allowed_threads(card,0xffffffff);
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if (recover_state == DEV_STATE_RECOVER) {
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lcs_set_multicast_list(card->dev);
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card->dev->flags |= IFF_UP;
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netif_wake_queue(card->dev);
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card->state = DEV_STATE_UP;
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} else
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} else {
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lcs_stopcard(card);
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}
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if (lcs_register_netdev(ccwgdev) != 0)
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goto out;
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/* Print out supported assists: IPv6 */
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PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
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(card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
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"with" : "without");
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/* Print out supported assist: Multicast */
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PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
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(card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
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"with" : "without");
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return 0;
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out:
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