From db8516f61b481e82cec398474ed716d926de7f94 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Tue, 2 Feb 2010 15:31:02 +0000 Subject: [PATCH] USB: isp1760: Flush the D-cache for the pipe-in transfer buffers When the HDC driver writes the data to the transfer buffers it pollutes the D-cache (unlike DMA drivers where the device writes the data). If the corresponding pages get mapped into user space, there are no additional cache flushing operations performed and this causes random user space faults on architectures with separate I and D caches (Harvard) or those with aliasing D-cache. Signed-off-by: Catalin Marinas Cc: Matthew Dharm Cc: Greg KH Cc: Sebastian Siewior Cc: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/isp1760-hcd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c index 27b8f7cb4471..9f01293600b0 100644 --- a/drivers/usb/host/isp1760-hcd.c +++ b/drivers/usb/host/isp1760-hcd.c @@ -17,7 +17,9 @@ #include #include #include +#include #include +#include #include "../core/hcd.h" #include "isp1760-hcd.h" @@ -904,6 +906,14 @@ __acquires(priv->lock) status = 0; } + if (usb_pipein(urb->pipe) && usb_pipetype(urb->pipe) != PIPE_CONTROL) { + void *ptr; + for (ptr = urb->transfer_buffer; + ptr < urb->transfer_buffer + urb->transfer_buffer_length; + ptr += PAGE_SIZE) + flush_dcache_page(virt_to_page(ptr)); + } + /* complete() can reenter this HCD */ usb_hcd_unlink_urb_from_ep(priv_to_hcd(priv), urb); spin_unlock(&priv->lock); -- 2.34.1