Am Freitag, 29. Mai 2015, 13:22:26 schrieb Yunzhi Li: > When s3c_hsotg_handle_unaligned_buf_complete() hs_req->req.buf > already destroyed, in s3c_hsotg_unmap_dma(), it touches > hs_req->req.dma again, so s3c_hsotg_unmap_dma() should be called > before s3c_hsotg_handle_unaligned_buf_complete(). Otherwise, it > will cause a bad_page BUG, when allocate this memory page next > time. > > This bug led to the following crash: > > BUG: Bad page state in process swapper/0 pfn:2bdbc > [ 26.820440] page:eed76780 count:0 mapcount:0 mapping: (null) index:0x0 > [ 26.854710] page flags: 0x200(arch_1) > [ 26.885836] page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set > [ 26.919179] bad because of flags: > [ 26.948917] page flags: 0x200(arch_1) > [ 26.979100] Modules linked in: > [ 27.008401] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W3.14.0 #17 > [ 27.041816] [<c010e1f8>] (unwind_backtrace) from [<c010a704>] > (show_stack+0x20/0x24) [ 27.076108] [<c010a704>] (show_stack) from > [<c087eea8>] (dump_stack+0x70/0x8c) [ 27.110246] [<c087eea8>] > (dump_stack) from [<c01ce0b8>] (bad_page+0xfc/0x12c) [ 27.143958] > [<c01ce0b8>] (bad_page) from [<c01ce65c>] > (get_page_from_freelist+0x3e4/0x50c) [ 27.179298] [<c01ce65c>] > (get_page_from_freelist) from [<c01ce9a0>] (__alloc_pages_nodemask) [ > 27.216296] [<c01ce9a0>] (__alloc_pages_nodemask) from [<c01cf00c>] > (__get_free_pages+0x20/) [ 27.252326] [<c01cf00c>] (__get_free_pages) > from [<c01e5bec>] (kmalloc_order_trace+0x34/0xa) [ 27.288295] > [<c01e5bec>] (kmalloc_order_trace) from [<c0203304>] (__kmalloc+0x40/0x1ac) > [ 27.323751] [<c0203304>] (__kmalloc) from [<c052abc0>] > (s3c_hsotg_ep_queue.isra.12+0x7c/0x1) [ 27.359937] [<c052abc0>] > (s3c_hsotg_ep_queue.isra.12) from [<c052af88>] (s3c_hsotg_ep_queue) [ > 27.397478] [<c052af88>] (s3c_hsotg_ep_queue_lock) from [<c0554110>] > (rx_submit+0xfc/0x164) [ 27.433619] [<c0554110>] (rx_submit) from > [<c05546e8>] (rx_complete+0x22c/0x230) [ 27.468872] [<c05546e8>] > (rx_complete) from [<c052b528>] (s3c_hsotg_complete_request+0xfc/0) [ > 27.506240] [<c052b528>] (s3c_hsotg_complete_request) from [<c052bba0>] > (s3c_hsotg_handle_o) [ 27.545401] [<c052bba0>] (s3c_hsotg_handle_outdone) > from [<c052be70>] (s3c_hsotg_epint+0x2c) [ 27.583689] [<c052be70>] > (s3c_hsotg_epint) from [<c052c750>] (s3c_hsotg_irq+0x1dc/0x4ac) [ > 27.621041] [<c052c750>] (s3c_hsotg_irq) from [<c01682e0>] > (handle_irq_event_percpu+0x70/0x) [ 27.659066] [<c01682e0>] > (handle_irq_event_percpu) from [<c01684ec>] (handle_irq_event+0x4c) [ > 27.697322] [<c01684ec>] (handle_irq_event) from [<c016bae0>] > (handle_fasteoi_irq+0xc8/0x11) [ 27.735451] [<c016bae0>] > (handle_fasteoi_irq) from [<c0167b8c>] (generic_handle_irq+0x30/0x) [ > 27.773918] [<c0167b8c>] (generic_handle_irq) from [<c0167ca4>] > (__handle_domain_irq+0x84/0) [ 27.812018] [<c0167ca4>] > (__handle_domain_irq) from [<c01003b0>] (gic_handle_irq+0x48/0x6c) [ > 27.849695] [<c01003b0>] (gic_handle_irq) from [<c010b340>] > (__irq_svc+0x40/0x50) [ 27.886907] Exception stack(0xc0d01ee0 to > 0xc0d01f28) > > Signed-off-by: Yunzhi Li <lyz@xxxxxxxxxxxxxx> on a rk3288 Tested-by: Heiko Stuebner <heiko@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
