This is a note to let you know that I've just added the patch titled
xhci: Fix memory leak bug when dropping endpoints
to the 2.6.39-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:
xhci-fix-memory-leak-bug-when-dropping-endpoints.patch
and it can be found in the queue-2.6.39 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 834cb0fc4712a3b21c6b8c5cb55bd13607191311 Mon Sep 17 00:00:00 2001
From: Sarah Sharp <[email protected]>
Date: Thu, 12 May 2011 18:06:37 -0700
Subject: xhci: Fix memory leak bug when dropping endpoints
From: Sarah Sharp <[email protected]>
commit 834cb0fc4712a3b21c6b8c5cb55bd13607191311 upstream.
When the USB core wants to change to an alternate interface setting that
doesn't include an active endpoint, or de-configuring the device, the xHCI
driver needs to issue a Configure Endpoint command to tell the host to
drop some endpoints from the schedule. After the command completes, the
xHCI driver needs to free rings for any endpoints that were dropped.
Unfortunately, the xHCI driver wasn't actually freeing the endpoint rings
for dropped endpoints. The rings would be freed if the endpoint's
information was simply changed (and a new ring was installed), but dropped
endpoints never had their rings freed. This caused errors when the ring
segment DMA pool was freed when the xHCI driver was unloaded:
[ 5582.883995] xhci_hcd 0000:06:00.0: dma_pool_destroy xHCI ring segments,
ffff88003371d000 busy
[ 5582.884002] xhci_hcd 0000:06:00.0: dma_pool_destroy xHCI ring segments,
ffff880033716000 busy
[ 5582.884011] xhci_hcd 0000:06:00.0: dma_pool_destroy xHCI ring segments,
ffff880033455000 busy
[ 5582.884018] xhci_hcd 0000:06:00.0: Freed segment pool
[ 5582.884026] xhci_hcd 0000:06:00.0: Freed device context pool
[ 5582.884033] xhci_hcd 0000:06:00.0: Freed small stream array pool
[ 5582.884038] xhci_hcd 0000:06:00.0: Freed medium stream array pool
[ 5582.884048] xhci_hcd 0000:06:00.0: xhci_stop completed - status = 1
[ 5582.884061] xhci_hcd 0000:06:00.0: USB bus 3 deregistered
[ 5582.884193] xhci_hcd 0000:06:00.0: PCI INT A disabled
Fix this issue and free endpoint rings when their endpoints are
successfully dropped.
This patch should be backported to kernels as old as 2.6.31.
Signed-off-by: Sarah Sharp <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/host/xhci.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1692,8 +1692,17 @@ int xhci_check_bandwidth(struct usb_hcd
xhci_dbg_ctx(xhci, virt_dev->out_ctx,
LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
+ /* Free any rings that were dropped, but not changed. */
+ for (i = 1; i < 31; ++i) {
+ if ((ctrl_ctx->drop_flags & (1 << (i + 1))) &&
+ !(ctrl_ctx->add_flags & (1 << (i + 1))))
+ xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
+ }
xhci_zero_in_ctx(xhci, virt_dev);
- /* Install new rings and free or cache any old rings */
+ /*
+ * Install any rings for completely new endpoints or changed endpoints,
+ * and free or cache any old rings from changed endpoints.
+ */
for (i = 1; i < 31; ++i) {
if (!virt_dev->eps[i].new_ring)
continue;
Patches currently in stable-queue which might be from
[email protected] are
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