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authorStefan Richter <stefanr@s5r6.in-berlin.de>2011-05-01 14:50:31 -0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2011-05-10 16:53:46 -0400
commit105e53f863c04e1d9e5bb34bf753c9fdbce6a60c (patch)
tree63500c7cb130348b70279cdbfdfb278de6fc83ad /drivers/firewire/core.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 'drivers/firewire/core.h')
-rw-r--r--drivers/firewire/core.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 00ea7730c6a7..0fe4e4e6eda7 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -140,8 +140,6 @@ void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p);
140extern struct rw_semaphore fw_device_rwsem; 140extern struct rw_semaphore fw_device_rwsem;
141extern struct idr fw_device_idr; 141extern struct idr fw_device_idr;
142extern int fw_cdev_major; 142extern int fw_cdev_major;
143struct workqueue_struct;
144extern struct workqueue_struct *fw_wq;
145 143
146struct fw_device *fw_device_get_by_devt(dev_t devt); 144struct fw_device *fw_device_get_by_devt(dev_t devt);
147int fw_device_set_broadcast_channel(struct device *dev, void *gen); 145int fw_device_set_broadcast_channel(struct device *dev, void *gen);