From: Peter Chen Date: Wed, 17 May 2017 15:32:01 +0000 (+0300) Subject: usb: host: xhci-mem: allocate zeroed Scratchpad Buffer X-Git-Tag: v3.2.93~79 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b90abb0bc79e3ab1a2a8b6e5d5f69a267742b0c;p=pandora-kernel.git usb: host: xhci-mem: allocate zeroed Scratchpad Buffer 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 Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.2: we only do one allocation for scratchpad buffers] Signed-off-by: Ben Hutchings --- diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 337b86695dfc..841eb6878e97 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1591,7 +1591,7 @@ static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags) if (!xhci->scratchpad) goto fail_sp; - xhci->scratchpad->sp_array = dma_alloc_coherent(dev, + xhci->scratchpad->sp_array = dma_zalloc_coherent(dev, num_sp * sizeof(u64), &xhci->scratchpad->sp_dma, flags); if (!xhci->scratchpad->sp_array)