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authorRoland Dreier <roland@purestorage.com>2014-03-04 19:57:51 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-08 22:08:29 -0800
commitaa0689b36b2144e91d2182605bed951565c4899b (patch)
tree695d359431f5dea57612688786f2ac0d10c40f51 /drivers/base/core.c
parent88391d49abb7d8dee91d405f96bd9e003cb6798d (diff)
downloadop-kernel-dev-aa0689b36b2144e91d2182605bed951565c4899b.zip
op-kernel-dev-aa0689b36b2144e91d2182605bed951565c4899b.tar.gz
Revert "driver core: synchronize device shutdown"
This reverts commit 401097ea4b89846d66ac78f7f108d49c2e922d9c. The original changelog said: A patch series to make .shutdown execute asynchronously. Some drivers's shutdown can take a lot of time. The patches can help save some shutdown time. The patches use Arjan's async API. This patch: synchronize all tasks submitted by .shutdown However, I'm not able to find any evidence that any other patches from this series were applied, nor am I able to find any async tasks that are scheduled in a .shutdown context. On the other hand, we see occasional hangs on shutdown that appear to be caused by the async_synchronize_full() in device_shutdown() waiting forever for the async probing in sd if a SCSI disk shows up at just the wrong time — the system starts the probe, but begins shutting down and tears down too much of the SCSI driver to finish the probe. If we had any async shutdown tasks, I guess the right fix would be to create a "shutdown" async domain and have device_shutdown() only wait for that domain. But since there apparently are no async shutdown tasks, we can just revert the waiting. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 80b6a9b..20da3ad 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -23,7 +23,6 @@
#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/mutex.h>
-#include <linux/async.h>
#include <linux/pm_runtime.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
@@ -1987,7 +1986,6 @@ void device_shutdown(void)
spin_lock(&devices_kset->list_lock);
}
spin_unlock(&devices_kset->list_lock);
- async_synchronize_full();
}
/*
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