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Subject10/19
From
dm_suspend(): Stop holding the read lock around the while loop that
waits for pending io to complete.
--- diff/drivers/md/dm.c 2002-12-16 09:41:03.000000000 +0000
+++ source/drivers/md/dm.c 2002-12-16 09:41:08.000000000 +0000
@@ -715,15 +715,13 @@
}

set_bit(DMF_BLOCK_IO, &md->flags);
+ add_wait_queue(&md->wait, &wait);
up_write(&md->lock);

/*
* Then we wait for the already mapped ios to
* complete.
*/
- down_read(&md->lock);
-
- add_wait_queue(&md->wait, &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);

@@ -734,11 +732,11 @@
}

current->state = TASK_RUNNING;
- remove_wait_queue(&md->wait, &wait);
- up_read(&md->lock);

- /* set_bit is atomic */
+ down_write(&md->lock);
+ remove_wait_queue(&md->wait, &wait);
set_bit(DMF_SUSPENDED, &md->flags);
+ up_write(&md->lock);

return 0;
}
-
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