Date: Sat, 19 Sep 2020 08:04:53 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 237666] repeated messages of "uhub_reattach_port: giving up port reset - device vanished" Message-ID: <bug-237666-19105-8fU7uKBegg@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-237666-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666 --- Comment #136 from Hans Petter Selasky <hselasky@FreeBSD.org> --- Mark, Your finding indicate a problem in usb_pc_cpu_flush() and bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE); Try to put the dsb only after dmamap_sync. void usb_pc_cpu_flush(struct usb_page_cache *pc) { if (pc->page_offset_end == pc->page_offset_buf) { /* nothing has been loaded into this page cache! */ return; } bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE); } The PCI I/O memory should be coherent and should not need any DSB's. --HPS -- You are receiving this mail because: You are the assignee for the bug.home | help
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