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Commit 7480d912 authored by Peter Chen's avatar Peter Chen Committed by Greg Kroah-Hartman
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usb: host: xhci-mem: allocate zeroed Scratchpad Buffer 



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'

Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a0c16630

drivers/usb/host/xhci-mem.c

+1 −1
Original line number Diff line number Diff line
@@ -1724,7 +1724,7 @@ static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags) 
	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_sp4;