xhci: Fix memory leak in ring cache deallocation.

When an endpoint ring is freed, it is either cached in a per-device ring
cache, or simply freed if the ring cache is full.  If the ring was added
to the cache, then virt_dev->num_rings_cached is incremented.  The cache
is designed to hold up to 31 endpoint rings, in array indexes 0 to 30.
When the device is freed (when the slot was disabled),
xhci_free_virt_device() is called, it would free the cached rings in
array indexes 0 to virt_dev->num_rings_cached.

Unfortunately, the original code in xhci_free_or_cache_endpoint_ring()
would put the first entry into the ring cache in array index 1, instead of
array index 0.  This was caused by the second assignment to rings_cached:

	rings_cached = virt_dev->num_rings_cached;
	if (rings_cached < XHCI_MAX_RINGS_CACHED) {
		virt_dev->num_rings_cached++;
		rings_cached = virt_dev->num_rings_cached;
		virt_dev->ring_cache[rings_cached] =
			virt_dev->eps[ep_index].ring;

This meant that when the device was freed, cached rings with indexes 0 to
N would be freed, and the last cached ring in index N+1 would not be
freed.  When the driver was unloaded, this caused interesting messages
like:

xhci_hcd 0000:06:00.0: dma_pool_destroy xHCI ring segments, ffff880063040000 busy

This should be queued to stable kernels back to 2.6.33.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 6938cc8d848f..26caba4c1950 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -209,14 +209,13 @@ void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
 
         rings_cached = virt_dev->num_rings_cached;
         if (rings_cached < XHCI_MAX_RINGS_CACHED) {
-                virt_dev->num_rings_cached++;
-                rings_cached = virt_dev->num_rings_cached;
                 virt_dev->ring_cache[rings_cached] =
                         virt_dev->eps[ep_index].ring;
+                virt_dev->num_rings_cached++;
                 xhci_dbg(xhci, "Cached old ring, "
                                 "%d ring%s cached\n",
-                                rings_cached,
-                                (rings_cached > 1) ? "s" : "");
+                                virt_dev->num_rings_cached,
+                                (virt_dev->num_rings_cached > 1) ? "s" : "");
         } else {
                 xhci_ring_free(xhci, virt_dev->eps[ep_index].ring);
                 xhci_dbg(xhci, "Ring cache full (%d rings), "