This is a note to let you know that I've just added the patch titled
usb: chipidea: need to mask when writting endptflush and endptprime
to the 3.13-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-chipidea-need-to-mask-when-writting-endptflush-and-endptprime.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5bf5dbeda2454296f1984adfbfc8e6f5965ac389 Mon Sep 17 00:00:00 2001
From: Matthieu CASTET <matthieu.castet@xxxxxxxxxx>
Date: Wed, 19 Feb 2014 13:46:31 +0800
Subject: usb: chipidea: need to mask when writting endptflush and endptprime
From: Matthieu CASTET <matthieu.castet@xxxxxxxxxx>
commit 5bf5dbeda2454296f1984adfbfc8e6f5965ac389 upstream.
ENDPTFLUSH and ENDPTPRIME registers are set by software and clear
by hardware. There is a bit for each endpoint. When we are setting
a bit for an endpoint we should make sure we do not touch other
endpoint bit. There is a race condition if the hardware clear the
bit between the read and the write in hw_write.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Signed-off-by: Matthieu CASTET <matthieu.castet@xxxxxxxxxx>
Tested-by: Michael Grzeschik <mgrzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/chipidea/udc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -105,7 +105,7 @@ static int hw_ep_flush(struct ci_hdrc *c
do {
/* flush any pending transfer */
- hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
+ hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
cpu_relax();
} while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
@@ -205,7 +205,7 @@ static int hw_ep_prime(struct ci_hdrc *c
if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
return -EAGAIN;
- hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
+ hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
cpu_relax();
Patches currently in stable-queue which might be from matthieu.castet@xxxxxxxxxx are
queue-3.13/usb-chipidea-need-to-mask-when-writting-endptflush-and-endptprime.patch
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