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authorDan Williams <dan.j.williams@intel.com>2012-07-09 19:33:30 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 09:07:37 +0100
commita4683487f90bfe3049686fc5c566bdc1ad03ace6 (patch)
treeb5aeadd3155256378804c04571febeee9f77c5fb /drivers/scsi
parent2955b47d2c1983998a8c5915cb96884e67f7cb53 (diff)
downloadlinux-a4683487f90bfe3049686fc5c566bdc1ad03ace6.tar.bz2
[SCSI] async: make async_synchronize_full() flush all work regardless of domain
In response to an async related regression James noted: "My theory is that this is an init problem: The assumption in a lot of our code is that async_synchronize_full() waits for everything ... even the domain specific async schedules, which isn't true." ...so make this assumption true. Each domain, including the default one, registers itself on a global domain list when work is scheduled. Once all entries complete it exits that list. Waiting for the list to be empty syncs all in-flight work across all domains. Domains can opt-out of global syncing if they are declared as exclusive ASYNC_DOMAIN_EXCLUSIVE(). All stack-based domains have been declared exclusive since the domain may go out of scope as soon as the last work item completes. Statically declared domains are mostly ok, but async_unregister_domain() is there to close any theoretical races with pending async_synchronize_full waiters at module removal time. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Reported-by: Meelis Roos <mroos@linux.ee> Reported-by: Eldad Zack <eldadzack@gmail.com> Tested-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/scsi.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 4cade886a50a..2936b447cae9 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -1355,6 +1355,7 @@ static void __exit exit_scsi(void)
scsi_exit_devinfo();
scsi_exit_procfs();
scsi_exit_queue();
+ async_unregister_domain(&scsi_sd_probe_domain);
}
subsys_initcall(init_scsi);