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| author | Roland Dreier <roland@purestorage.com> | 2014-03-05 04:57:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-09 07:08:29 +0100 |
| commit | aa0689b36b2144e91d2182605bed951565c4899b (patch) | |
| tree | 695d359431f5dea57612688786f2ac0d10c40f51 /drivers/base | |
| parent | kernfs: fix off by one error. (diff) | |
| download | linux-aa0689b36b2144e91d2182605bed951565c4899b.tar.xz linux-aa0689b36b2144e91d2182605bed951565c4899b.zip | |
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')
| -rw-r--r-- | drivers/base/core.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 80b6a9b22f3e..20da3ad1696b 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(); } /* |