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USB: isp1760: Flush the D-cache for the pipe-in transfer buffers

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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 <[email protected]>
Cc: Matthew Dharm <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Sebastian Siewior <[email protected]>
Cc: Oliver Neukum <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Catalin Marinas 2010-02-02 15:31:02 +00:00 • committed by Greg Kroah-Hartman
commit db8516f61b
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/host/isp1760-hcd.c
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@ -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_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);