15 Jan
2013
15 Jan
'13
5:50 p.m.
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