[stable] [PATCH RESEND] omap : nand : fix subpage ecc issue with prefetch

[Greg KH]

On Wed, May 11, 2011 at 07:54:57PM +0530, Kishore Kadiyala wrote:
> When reading/writing a subpage (When HW ECC is not available/enabled)
> for number of bytes not aligned to 4, the mis-aligned bytes are handled
> first (by cpu copy method) before enabling the Prefetch engine to/from
> 'p'(start of buffer 'buf'). Then it reads/writes rest of the bytes with
> the help of Prefetch engine, if available, or again using cpu copy method.
> Currently, reading/writing of rest of bytes, is not done correctly since
> its trying to read/write again to/from begining of buffer 'buf',
> overwriting the mis-aligned bytes.
> 
> Read & write using prefetch engine got broken in commit '2c01946c'.
> We never hit a scenario of not getting 'gpmc_prefetch_enable' call
> success. So, problem did not get caught up.
> 
> Signed-off-by: Kishore Kadiyala <kishore.kadiyala at ti.com>
> Signed-off-by: Vimal Singh <vimal.newwork at gmail.com>
> Reported-by: Bryan DE FARIA <bdefaria at adeneo-embedded.com>
> ---
>  drivers/mtd/nand/omap2.c |   12 +++++-------
>  1 files changed, 5 insertions(+), 7 deletions(-)


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

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