From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Date: Mon, 24 Aug 2015 14:06:15 -0400 (EDT) > On Mon, 24 Aug 2015, David Miller wrote: >> Atomic operations like clear_bit also will behave that way. > > Are you certain about that? I couldn't find any mention of it in > Documentation/atomic_ops.txt. > > In theory, an architecture could implement atomic bit operations using > a spinlock to insure atomicity. I don't know if any architectures do > this, but if they do then the scenario above could arise. Indeed, we do have platforms like 32-bit sparc and parisc that do this. So, taking that into consideration, this is a bit unfortunate and on such platforms we do have this problem. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
