Messages in this thread | | | Date | Tue, 15 Jan 2013 09:50:20 -0800 | From | Greg KH <> | Subject | Re: [PATCH v2] mm: dmapool: use provided gfp flags for all dma_alloc_coherent() calls |
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On Tue, Jan 15, 2013 at 11:56:42AM -0500, Jason Cooper wrote: > Greg, > > I've added you to the this thread hoping for a little insight into USB > drivers and their use of coherent and GFP_ATOMIC. Am I barking up the > wrong tree by looking a the drivers?
I don't understand, which drivers are you referring to? USB host controller drivers, or the "normal" drivers? Most USB drivers use GFP_ATOMIC if they are creating memory during their URB callback path, as that is interrupt context. But it shouldn't be all that bad, and the USB core hasn't changed in a while, so something else must be causing this.
greg k-h
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