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authorStefan Richter <stefanr@s5r6.in-berlin.de>2011-05-01 20:50:31 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2011-05-10 22:53:46 +0200
commit105e53f863c04e1d9e5bb34bf753c9fdbce6a60c (patch)
tree63500c7cb130348b70279cdbfdfb278de6fc83ad /include/linux/firewire.h
parent81bf52d8622f05cfe89893fd5c1101efd85f855b (diff)
firewire: sbp2: parallelize login, reconnect, logout
The struct sbp2_logical_unit.work items can all be executed in parallel but are not reentrant. Furthermore, reconnect or re-login work must be executed in a WQ_MEM_RECLAIM workqueue. Hence replace the old single-threaded firewire-sbp2 workqueue by a concurrency-managed but non-reentrant workqueue with rescuer. firewire-core already maintains one, hence use this one. In earlier versions of this change, I observed occasional failures of parallel INQUIRY to an Initio INIC-2430 FireWire 800 to dual IDE bridge. More testing indicates that parallel INQUIRY is not actually a problem, but too quick successions of logout and login + INQUIRY, e.g. a quick sequence of cable plugout and plugin, can result in failed INQUIRY. This does not seem to be something that should or could be addressed by serialization. Another dual-LU device to which I currently have access to, an OXUF924DSB FireWire 800 to dual SATA bridge with firmware from MacPower, has been successfully tested with this too. This change is beneficial to environments with two or more FireWire storage devices, especially if they are located on the same bus. Management tasks that should be performed as soon and as quickly as possible, especially reconnect, are no longer held up by tasks on other devices that may take a long time, especially login with INQUIRY and sd or sr driver probe. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'include/linux/firewire.h')
-rw-r--r--include/linux/firewire.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index c0fb405bb435..5e6f42789afe 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -449,4 +449,6 @@ void fw_iso_resource_manage(struct fw_card *card, int generation,
u64 channels_mask, int *channel, int *bandwidth,
bool allocate);
+extern struct workqueue_struct *fw_workqueue;
+
#endif /* _LINUX_FIREWIRE_H */

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