[PATCH 1/2] misc: add CARMA DATA-FPGA Access Driver
dmitry.torokhov at gmail.com
Wed Feb 9 06:33:21 EST 2011
On Tue, Feb 08, 2011 at 11:11:44AM -0800, Ira W. Snyder wrote:
> On Tue, Feb 08, 2011 at 09:50:29AM -0800, Dmitry Torokhov wrote:
> > On Tue, Feb 08, 2011 at 09:20:46AM -0800, Ira W. Snyder wrote:
> > > Go back and re-think my loop. This is a
> > > common idiom straight of out LDD3 pages 153-154.
> > >
> > > You should note that it is only possible to exit the loop with the lock
> > > held AND !list_empty(used). The lock protects the used list, and
> > > therefore, there must be a buffer on the list.
> > No, because you are woken up while not holding the lock so another
> > reader is free to take it off the list.
> Correct. But then I go around the loop and check list_empty() again
> before exiting the loop. The list MUST NOT be empty before the loop will
Yes, you are right, I competely missed the fact that we'd loop around
and check the condition again. I'll go grab another coffee now.
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