From: Paul Mundt Date: Thu, 4 Feb 2010 06:57:58 +0000 (+0000) Subject: usb: r8a66597-hcd: Flush the D-cache for the pipe-in transfer buffers. X-Git-Tag: v2.6.33-rc8~43^2~5 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2717568e7c44fe7dc3f4f52ea823811cfeede2b5;p=pandora-kernel.git usb: r8a66597-hcd: Flush the D-cache for the pipe-in transfer buffers. This implements the same D-cache flushing logic for r8a66597-hcd as Catalin's isp1760 (http://patchwork.kernel.org/patch/76391/) change, with the same note applying here as well: 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. This fixes up crashes during USB boot on SH7724 and others: http://marc.info/?l=linux-sh&m=126439837308912&w=2 Reported-by: Goda Yusuke Tested-by: Goda Yusuke Cc: stable@kernel.org Signed-off-by: Paul Mundt Acked-by: Yoshihiro Shimoda --- Reading git-diff-tree failed