af_unix: use freezable blocking calls in read

Avoid waking up every thread sleeping in read call on an AF_UNIX
socket during suspend and resume by calling a freezable blocking
call.  Previous patches modified the freezer to avoid sending
wakeups to threads that are blocked in freezable blocking calls.

This call was selected to be converted to a freezable call because
it doesn't hold any locks or release any resources when interrupted
that might be needed by another freezing task or a kernel driver
during suspend, and is a common site where idle userspace tasks are

Change-Id: I788246a76780ea892659526e70be018b18f646c4
Acked-by: Tejun Heo <>
Signed-off-by: Colin Cross <>
Signed-off-by: Rafael J. Wysocki <>
1 file changed