This is a note to let you know that I've just added the patch titled
usb: musb: Get the musb_qh poniter after musb_giveback
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-musb-get-the-musb_qh-poniter-after-musb_giveback.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 33d7e37232155aadebe4145dcc592f00dabd7a2b Mon Sep 17 00:00:00 2001
From: Xingxing Luo <xingxing.luo@xxxxxxxxxx>
Date: Tue, 19 Sep 2023 11:30:55 +0800
Subject: usb: musb: Get the musb_qh poniter after musb_giveback
From: Xingxing Luo <xingxing.luo@xxxxxxxxxx>
commit 33d7e37232155aadebe4145dcc592f00dabd7a2b upstream.
When multiple threads are performing USB transmission, musb->lock will be
unlocked when musb_giveback is executed. At this time, qh may be released
in the dequeue process in other threads, resulting in a wild pointer, so
it needs to be here get qh again, and judge whether qh is NULL, and when
dequeue, you need to set qh to NULL.
Fixes: dbac5d07d13e ("usb: musb: host: don't start next rx urb if current one failed")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xingxing Luo <xingxing.luo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230919033055.14085-1-xingxing.luo@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/musb/musb_host.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -339,10 +339,16 @@ static void musb_advance_schedule(struct
musb_giveback(musb, urb, status);
qh->is_ready = ready;
+ /*
+ * musb->lock had been unlocked in musb_giveback, so qh may
+ * be freed, need to get it again
+ */
+ qh = musb_ep_get_qh(hw_ep, is_in);
+
/* reclaim resources (and bandwidth) ASAP; deschedule it, and
* invalidate qh as soon as list_empty(&hep->urb_list)
*/
- if (list_empty(&qh->hep->urb_list)) {
+ if (qh && list_empty(&qh->hep->urb_list)) {
struct list_head *head;
struct dma_controller *dma = musb->dma_controller;
@@ -2424,6 +2430,7 @@ static int musb_urb_dequeue(struct usb_h
* and its URB list has emptied, recycle this qh.
*/
if (ready && list_empty(&qh->hep->urb_list)) {
+ musb_ep_set_qh(qh->hw_ep, is_in, NULL);
qh->hep->hcpriv = NULL;
list_del(&qh->ring);
kfree(qh);
Patches currently in stable-queue which might be from xingxing.luo@xxxxxxxxxx are
queue-5.4/usb-musb-modify-the-hwvers-register-address.patch
queue-5.4/usb-musb-get-the-musb_qh-poniter-after-musb_giveback.patch
