On Sun, 2015-08-30 at 14:41 -0400, Jes Sorensen wrote: > > > > +> > > > > > urb = usb_alloc_urb(0, GFP_KERNEL); > > > > The above statement generated a "scheduling while atomic" splat. The > > gfp_t argument needs to be GFP_KERNEL. > > You are seeing scheduling while atomic in the TX path? That just seems > wrong to me - Johannes is the mac80211 TX path not meant to allow > sleeping? The TX path is one of the few things where you can't sleep - that's needed for performance reasons since the network stack doesn't allow sleeping in the TX path. > I have never seen this on x86 and I have been running the driver for a > long time. It is puzzling this causes a problem on PowerPC. It there > something special in the config for it? I am inclined to say there is > something wrong with the PPC32 setup rather than with my usage of > GFP_KERNEL in the TX path. No, using GFP_KERNEL is wrong here. You're perhaps not enabling enough options for it to come to a warning on x86. > johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
