mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 07:22:33 +00:00
44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
|
From 9d51ba9909129465493d56a7134ce4220d2e69e9 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jonathan Bell <jonathan@raspberrypi.com>
|
||
|
|
Date: Mon, 16 Aug 2021 14:43:06 +0100
|
||
|
|
Subject: [PATCH] xhci: guard accesses to ep_state in
|
||
|
|
xhci_endpoint_reset()
|
||
|
|
|
||
|
|
See https://github.com/raspberrypi/linux/issues/3981
|
||
|
|
|
||
|
|
Two read-modify-write cycles on ep->ep_state are not guarded by
|
||
|
|
xhci->lock. Fix these.
|
||
|
|
|
||
|
|
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
|
||
|
|
---
|
||
|
|
drivers/usb/host/xhci.c | 5 +++++
|
||
|
|
1 file changed, 5 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/usb/host/xhci.c
|
||
|
|
+++ b/drivers/usb/host/xhci.c
|
||
|
|
@@ -3269,10 +3269,13 @@ static void xhci_endpoint_reset(struct u
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* Bail out if toggle is already being cleared by a endpoint reset */
|
||
|
|
+ spin_lock_irqsave(&xhci->lock, flags);
|
||
|
|
if (ep->ep_state & EP_HARD_CLEAR_TOGGLE) {
|
||
|
|
ep->ep_state &= ~EP_HARD_CLEAR_TOGGLE;
|
||
|
|
+ spin_unlock_irqrestore(&xhci->lock, flags);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
+ spin_unlock_irqrestore(&xhci->lock, flags);
|
||
|
|
/* Only interrupt and bulk ep's use data toggle, USB2 spec 5.5.4-> */
|
||
|
|
if (usb_endpoint_xfer_control(&host_ep->desc) ||
|
||
|
|
usb_endpoint_xfer_isoc(&host_ep->desc))
|
||
|
|
@@ -3358,8 +3361,10 @@ static void xhci_endpoint_reset(struct u
|
||
|
|
xhci_free_command(xhci, cfg_cmd);
|
||
|
|
cleanup:
|
||
|
|
xhci_free_command(xhci, stop_cmd);
|
||
|
|
+ spin_lock_irqsave(&xhci->lock, flags);
|
||
|
|
if (ep->ep_state & EP_SOFT_CLEAR_TOGGLE)
|
||
|
|
ep->ep_state &= ~EP_SOFT_CLEAR_TOGGLE;
|
||
|
|
+ spin_unlock_irqrestore(&xhci->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
|