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44 lines
1.7 KiB
Diff
44 lines
1.7 KiB
Diff
From 7ae8ef63c14ca2fea76c9db5799321f1b3e31c36 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.org>
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Date: Tue, 7 Jan 2020 10:08:19 +0000
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Subject: [PATCH] dwc_otg: constrain endpoint max packet and transfer
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size on split IN
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The hcd would unconditionally set the transfer length to the endpoint
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packet size for non-isoc IN transfers. If the remaining buffer length
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was less than the length of returned data, random memory would get
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scribbled over, with bad effects if it crossed a page boundary.
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Force a babble error if this happens by limiting the max transfer size
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to the available buffer space. DMA will stop writing to memory on a
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babble condition.
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The hardware expects xfersize to be an integer multiple of maxpacket
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size, so override hcchar.b.mps as well.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
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---
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drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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@@ -1813,7 +1813,7 @@ int fiq_fsm_queue_split_transaction(dwc_
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st->nr_errors = 0;
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st->hcchar_copy.d32 = 0;
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- st->hcchar_copy.b.mps = hc->max_packet;
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+ st->hcchar_copy.b.mps = min_t(uint32_t, hc->xfer_len, hc->max_packet);
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st->hcchar_copy.b.epdir = hc->ep_is_in;
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st->hcchar_copy.b.devaddr = hc->dev_addr;
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st->hcchar_copy.b.epnum = hc->ep_num;
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@@ -1858,7 +1858,7 @@ int fiq_fsm_queue_split_transaction(dwc_
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st->hctsiz_copy.b.pid = hc->data_pid_start;
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if (hc->ep_is_in || (hc->xfer_len > hc->max_packet)) {
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- hc->xfer_len = hc->max_packet;
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+ hc->xfer_len = min_t(uint32_t, hc->xfer_len, hc->max_packet);
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} else if (!hc->ep_is_in && (hc->xfer_len > 188)) {
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hc->xfer_len = 188;
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}
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