Messages in this thread | | | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8 | From | Thomas Gleixner <> | Date | Thu, 21 Oct 2004 11:47:52 +0200 |
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On Thu, 2004-10-21 at 11:35, Christoph Hellwig wrote: > On Thu, Oct 21, 2004 at 11:16:30AM +0200, Thomas Gleixner wrote: > > On Thu, 2004-10-21 at 11:12, Rui Nuno Capela wrote: > > > [<e018e139>] queuecommand+0x70/0x7c [usb_storage] (24) > > > > As I already pointed out, this is a problem due to up(sema) in > > queuecommand. That's one of the semaphore abuse points, which needs to > > be fixed. > > > > The problem is that semaphores are hold by Process A and released by > > Process B, which makes Ingo's checks trigger > > Which is perfectly valid for a semaphore. >
In fact this is used where wait_for_completion() is the correct thing to do. It's not waiting for a resource. It's waiting for completion of a commoand.
tglx
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