[patch 3/10] s390: set online race in the lcs driver.
From: Michael Holzheu <[email protected]>
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 <[email protected]>
diffstat:
drivers/s390/net/lcs.c | 31 ++++++++++++++++---------------
1 files changed, 16 insertions(+), 15 deletions(-)
diff -urpN linux-2.6/drivers/s390/net/lcs.c linux-2.6-patched/drivers/s390/net/lcs.c
--- linux-2.6/drivers/s390/net/lcs.c 2005-05-06 11:26:14.000000000 +0200
+++ linux-2.6-patched/drivers/s390/net/lcs.c 2005-05-06 11:26:16.000000000 +0200
@@ -11,7 +11,7 @@
* Frank Pavlic ([email protected]) and
* Martin Schwidefsky <[email protected]>
*
- * $Revision: 1.97 $ $Date: 2005/03/31 09:42:02 $
+ * $Revision: 1.98 $ $Date: 2005/04/18 13:41:29 $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -59,7 +59,7 @@
/**
* initialization string for output
*/
-#define VERSION_LCS_C "$Revision: 1.97 $"
+#define VERSION_LCS_C "$Revision: 1.98 $"
static char version[] __initdata = "LCS driver ("VERSION_LCS_C "/" VERSION_LCS_H ")";
static char debug_buffer[255];
@@ -1098,14 +1098,6 @@ lcs_check_multicast_support(struct lcs_c
PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
return -EOPNOTSUPP;
}
- /* Print out supported assists: IPv6 */
- PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
- (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
- "with" : "without");
- /* Print out supported assist: Multicast */
- PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
- (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
- "with" : "without");
if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
return 0;
return -EOPNOTSUPP;
@@ -2198,30 +2190,39 @@ lcs_new_device(struct ccwgroup_device *c
if (!dev)
goto out;
card->dev = dev;
-netdev_out:
card->dev->priv = card;
card->dev->open = lcs_open_device;
card->dev->stop = lcs_stop_device;
card->dev->hard_start_xmit = lcs_start_xmit;
card->dev->get_stats = lcs_getstats;
SET_MODULE_OWNER(dev);
- if (lcs_register_netdev(ccwgdev) != 0)
- goto out;
memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
#ifdef CONFIG_IP_MULTICAST
if (!lcs_check_multicast_support(card))
card->dev->set_multicast_list = lcs_set_multicast_list;
#endif
- netif_stop_queue(card->dev);
+netdev_out:
lcs_set_allowed_threads(card,0xffffffff);
if (recover_state == DEV_STATE_RECOVER) {
lcs_set_multicast_list(card->dev);
card->dev->flags |= IFF_UP;
netif_wake_queue(card->dev);
card->state = DEV_STATE_UP;
- } else
+ } else {
lcs_stopcard(card);
+ }
+ if (lcs_register_netdev(ccwgdev) != 0)
+ goto out;
+
+ /* Print out supported assists: IPv6 */
+ PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
+ (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
+ "with" : "without");
+ /* Print out supported assist: Multicast */
+ PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
+ (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
+ "with" : "without");
return 0;
out:
-
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