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SubjectRe: [PATCH] cciss: do not attempt to read from a write-only register
On Thu, 21 Jul 2011 13:16:01 -0500
"Stephen M. Cameron" <scameron@beardog.cce.hp.com> wrote:

> From: Stephen M. Cameron <scameron@beardog.cce.hp.com>
>
> Most smartarrays will tolerate it, but some new ones don't.
> Without this change some newer Smart Arrays will lock up
> and i/o will grind to a halt.
>
> Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>

No Cc: <stable@kernel.org>?

> drivers/block/cciss.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
> index 16b4d58..c049548 100644
> --- a/drivers/block/cciss.h
> +++ b/drivers/block/cciss.h
> @@ -223,7 +223,7 @@ static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c)
> h->ctlr, c->busaddr);
> #endif /* CCISS_DEBUG */
> writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
> - readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
> + readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
> h->commands_outstanding++;
> if ( h->commands_outstanding > h->max_outstanding)
> h->max_outstanding = h->commands_outstanding;


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