This is a note to let you know that I've just added the patch titled
usb: host: xhci-mem: allocate zeroed Scratchpad Buffer
to the 3.18-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-host-xhci-mem-allocate-zeroed-scratchpad-buffer.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7480d912d549f414e0ce39331870899e89a5598c Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@xxxxxxx>
Date: Wed, 17 May 2017 18:32:01 +0300
Subject: usb: host: xhci-mem: allocate zeroed Scratchpad Buffer
From: Peter Chen <peter.chen@xxxxxxx>
commit 7480d912d549f414e0ce39331870899e89a5598c upstream.
According to xHCI ch4.20 Scratchpad Buffers, the Scratchpad
Buffer needs to be zeroed.
...
The following operations take place to allocate
Scratchpad Buffers to the xHC:
...
b. Software clears the Scratchpad Buffer to '0'
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1676,7 +1676,7 @@ static int scratchpad_alloc(struct xhci_
xhci->dcbaa->dev_context_ptrs[0] = cpu_to_le64(xhci->scratchpad->sp_dma);
for (i = 0; i < num_sp; i++) {
dma_addr_t dma;
- void *buf = dma_alloc_coherent(dev, xhci->page_size, &dma,
+ void *buf = dma_zalloc_coherent(dev, xhci->page_size, &dma,
flags);
if (!buf)
goto fail_sp5;
Patches currently in stable-queue which might be from peter.chen@xxxxxxx are
queue-3.18/usb-host-xhci-mem-allocate-zeroed-scratchpad-buffer.patch