diff options
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 80cc87c9ef..2582bf36eb 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -592,8 +592,9 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer, * dangerous operation, it's responsibility of the calling * code to make sure enough space is reserved. */ - invalidate_dcache_range((unsigned long)buffer, - ALIGN((unsigned long)buffer + length, ARCH_DMA_MINALIGN)); + if (buffer != NULL && length > 0) + invalidate_dcache_range((unsigned long)buffer, + ALIGN((unsigned long)buffer + length, ARCH_DMA_MINALIGN)); /* Check that the TD processing happened */ if (QT_TOKEN_GET_STATUS(token) & QT_TOKEN_STATUS_ACTIVE) |