diff options
| author | Peter Chen <peter.chen@nxp.com> | 2017-05-17 18:32:01 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-09-15 20:30:44 +0300 |
| commit | 6b90abb0bc79e3ab1a2a8b6e5d5f69a267742b0c (patch) | |
| tree | 45dd89d7b27fb2957df3716b3650adfc63c6cc7b /drivers | |
| parent | da2507969fa7b8cc0367fd8cdf651856e1d3bae6 (diff) | |
| download | linux-6b90abb0bc79e3ab1a2a8b6e5d5f69a267742b0c.tar.xz | |
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 <peter.chen@nxp.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: we only do one allocation for scratchpad buffers]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) |