[PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers

[Catalin Marinas]

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 <catalin.marinas@xxxxxxx>
Cc: Matthew Dharm <mdharm-kernel@xxxxxxxxxxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
---
 drivers/usb/host/isp1760-hcd.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c
index 27b8f7c..51445ad 100644
--- a/drivers/usb/host/isp1760-hcd.c
+++ b/drivers/usb/host/isp1760-hcd.c
@@ -17,7 +17,9 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
+#include <linux/mm.h>
 #include <asm/unaligned.h>
+#include <asm/cacheflush.h>
 
 #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_BULK) {
+		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);

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