diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0393-dwc_otg-constrain-endpoint-max-packet-and-transfer-s.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0393-dwc_otg-constrain-endpoint-max-packet-and-transfer-s.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0393-dwc_otg-constrain-endpoint-max-packet-and-transfer-s.patch b/target/linux/bcm27xx/patches-5.4/950-0393-dwc_otg-constrain-endpoint-max-packet-and-transfer-s.patch new file mode 100644 index 0000000000..7e4a3f8b38 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0393-dwc_otg-constrain-endpoint-max-packet-and-transfer-s.patch @@ -0,0 +1,43 @@ +From b7944a79716c115d881898e6a95705b262e7c1c9 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Tue, 7 Jan 2020 10:08:19 +0000 +Subject: [PATCH] dwc_otg: constrain endpoint max packet and transfer + size on split IN + +The hcd would unconditionally set the transfer length to the endpoint +packet size for non-isoc IN transfers. If the remaining buffer length +was less than the length of returned data, random memory would get +scribbled over, with bad effects if it crossed a page boundary. + +Force a babble error if this happens by limiting the max transfer size +to the available buffer space. DMA will stop writing to memory on a +babble condition. + +The hardware expects xfersize to be an integer multiple of maxpacket +size, so override hcchar.b.mps as well. + +Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org> +--- + drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c +@@ -1813,7 +1813,7 @@ int fiq_fsm_queue_split_transaction(dwc_ + st->nr_errors = 0; + + st->hcchar_copy.d32 = 0; +- st->hcchar_copy.b.mps = hc->max_packet; ++ st->hcchar_copy.b.mps = min_t(uint32_t, hc->xfer_len, hc->max_packet); + st->hcchar_copy.b.epdir = hc->ep_is_in; + st->hcchar_copy.b.devaddr = hc->dev_addr; + st->hcchar_copy.b.epnum = hc->ep_num; +@@ -1858,7 +1858,7 @@ int fiq_fsm_queue_split_transaction(dwc_ + st->hctsiz_copy.b.pid = hc->data_pid_start; + + if (hc->ep_is_in || (hc->xfer_len > hc->max_packet)) { +- hc->xfer_len = hc->max_packet; ++ hc->xfer_len = min_t(uint32_t, hc->xfer_len, hc->max_packet); + } else if (!hc->ep_is_in && (hc->xfer_len > 188)) { + hc->xfer_len = 188; + } |