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This patch (as869) reinstates the mutual exclusion between sysfs attribute method calls and attribute unregistration. The previously-reported deadlocks have been fixed, and this exclusion is by far the simplest way to avoid races during driver unbinding. The check for orphaned read-buffers has been moved down slightly, so that the remainder of a partially-read buffer will still be available to userspace even after the attribute has been unregistered. Signed-off-by: Alan Stern <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Cornelia Huck <[email protected]> Cc: Oliver Neukum <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>