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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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894021a752
We blindly assume that we can just take the rtnl lock and that will prevent races with downing this interface. Unfortunately, that's not the case. In ipoib_mcast_stop_thread() we will call flush_workqueue() in an attempt to clear out all remaining instances of ipoib_join_task. But, since this task is put on the same workqueue as the join task, the flush_workqueue waits on this thread too. But this thread is deadlocked on the rtnl lock. The better thing here is to use trylock and loop on that until we either get the lock or we see that FLAG_OPER_UP has been cleared, in which case we don't need to do anything anyway and we just return. While investigating which flag should be used, FLAG_ADMIN_UP or FLAG_OPER_UP, it was determined that FLAG_OPER_UP was the more appropriate flag to use. However, there was a mix of these two flags in use in the existing code. So while we check for that flag here as part of this race fix, also cleanup the two places that had used the less appropriate flag for their tests. Signed-off-by: Doug Ledford <dledford@redhat.com> |
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| .. | ||
| ipoib_cm.c | ||
| ipoib_ethtool.c | ||
| ipoib_fs.c | ||
| ipoib_ib.c | ||
| ipoib_main.c | ||
| ipoib_multicast.c | ||
| ipoib_netlink.c | ||
| ipoib_verbs.c | ||
| ipoib_vlan.c | ||
| ipoib.h | ||
| Kconfig | ||
| Makefile | ||