On Fri, Jun 01, 2018 at 09:23:46PM +0200, Luis R. Rodriguez wrote: > On Tue, May 08, 2018 at 03:38:05PM +0000, Luis R. Rodriguez wrote: > > On Fri, May 04, 2018 at 12:44:37PM -0700, Martijn Coenen wrote: > > > > > > I think the Qualcomm folks owning this (Andy, David, Bjorn, already > > > cc'd here) are better suited to answer that question. > > > > Andy, David, Bjorn? > > Andy, David, Bjorn? A month now with no answer... Perhaps someone who has this hardware can find out empirically for us, as follows (mm folks is this right?): page = virt_to_page(address); if (!page) fail closed... if (page_zone(page) == ZONE_DMA || page_zone(page) == ZONE_DMA32) this is a DMA buffer else not DMA! Note that when request_firmware_into_buf() was being reviewed Mimi had asked back in 2016 [0] that if a DMA buffer was going to be used READING_FIRMWARE_DMA should be used otherwise READING_FIRMWARE_PREALLOC_BUFFER was fine. If it is a DMA buffer *now*, why / how did this change? [0] https://patchwork.kernel.org/patch/9074611/ Luis
