This is a note to let you know that I've just added the patch titled
Revert "usb: musb: host: don't start next rx urb if current one failed"
to the 4.9-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:
revert-usb-musb-host-don-t-start-next-rx-urb-if-current-one-failed.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 44eb5e12b845cc8a0634f21b70ef07d774eb4b25 Mon Sep 17 00:00:00 2001
From: Bin Liu <b-liu@xxxxxx>
Date: Tue, 20 Feb 2018 07:31:35 -0600
Subject: Revert "usb: musb: host: don't start next rx urb if current one failed"
From: Bin Liu <b-liu@xxxxxx>
commit 44eb5e12b845cc8a0634f21b70ef07d774eb4b25 upstream.
This reverts commit dbac5d07d13e330e6706813c9fde477140fb5d80.
commit dbac5d07d13e ("usb: musb: host: don't start next rx urb if current one failed")
along with commit b5801212229f ("usb: musb: host: clear rxcsr error bit if set")
try to solve the issue described in [1], but the latter alone is
sufficient, and the former causes the issue as in [2], so now revert it.
[1] https://marc.info/?l=linux-usb&m=146173995117456&w=2
[2] https://marc.info/?l=linux-usb&m=151689238420622&w=2
Cc: stable@xxxxxxxxxxxxxxx # v4.7+
Signed-off-by: Bin Liu <b-liu@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/musb/musb_host.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -418,13 +418,7 @@ static void musb_advance_schedule(struct
}
}
- /*
- * The pipe must be broken if current urb->status is set, so don't
- * start next urb.
- * TODO: to minimize the risk of regression, only check urb->status
- * for RX, until we have a test case to understand the behavior of TX.
- */
- if ((!status || !is_in) && qh && qh->is_ready) {
+ if (qh != NULL && qh->is_ready) {
musb_dbg(musb, "... next ep%d %cX urb %p",
hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
musb_start_urb(musb, is_in, qh);
Patches currently in stable-queue which might be from b-liu@xxxxxx are
queue-4.9/revert-usb-musb-host-don-t-start-next-rx-urb-if-current-one-failed.patch