This is a note to let you know that I've just added the patch titled
usb: xhci: xhci-ring: Use sysdev for mapping bounce buffer
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-xhci-xhci-ring-use-sysdev-for-mapping-bounce-buffer.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 41a43013d2366db5b88b42bbcd8e8f040b6ccf21 Mon Sep 17 00:00:00 2001
From: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
Date: Fri, 15 Sep 2023 17:31:05 +0300
Subject: usb: xhci: xhci-ring: Use sysdev for mapping bounce buffer
From: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
commit 41a43013d2366db5b88b42bbcd8e8f040b6ccf21 upstream.
As mentioned in:
commit 474ed23a6257 ("xhci: align the last trb before link if it is
easily splittable.")
A bounce buffer is utilized for ensuring that transfers that span across
ring segments are aligned to the EP's max packet size. However, the device
that is used to map the DMA buffer to is currently using the XHCI HCD,
which does not carry any DMA operations in certain configrations.
Migration to using the sysdev entry was introduced for DWC3 based
implementations where the IOMMU operations are present.
Replace the reference to the controller device to sysdev instead. This
allows the bounce buffer to be properly mapped to any implementations that
have an IOMMU involved.
cc: stable@xxxxxxxxxxxxxxx
Fixes: 4c39d4b949d3 ("usb: xhci: use bus->sysdev for DMA configuration")
Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230915143108.1532163-2-mathias.nyman@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-ring.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -714,7 +714,7 @@ static void xhci_giveback_urb_in_irq(str
static void xhci_unmap_td_bounce_buffer(struct xhci_hcd *xhci,
struct xhci_ring *ring, struct xhci_td *td)
{
- struct device *dev = xhci_to_hcd(xhci)->self.controller;
+ struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
struct xhci_segment *seg = td->bounce_seg;
struct urb *urb = td->urb;
size_t len;
@@ -3283,7 +3283,7 @@ static u32 xhci_td_remainder(struct xhci
static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32 enqd_len,
u32 *trb_buff_len, struct xhci_segment *seg)
{
- struct device *dev = xhci_to_hcd(xhci)->self.controller;
+ struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
unsigned int unalign;
unsigned int max_pkt;
u32 new_buff_len;
Patches currently in stable-queue which might be from quic_wcheng@xxxxxxxxxxx are
queue-5.4/usb-xhci-xhci-ring-use-sysdev-for-mapping-bounce-buffer.patch
