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    Subject[34-longterm 133/179] cciss: do not attempt to read from a write-only register
    Date
    From: "Stephen M. Cameron" <scameron@beardog.cce.hp.com>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
    -------------------

    commit 07d0c38e7d84f911c72058a124c7f17b3c779a65 upstream.

    Most smartarrays will tolerate it, but some new ones don't.

    Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>

    Note: this is a regression caused by commit 1ddd5049
    Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    drivers/block/cciss.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
    index 37a2d4f..759cbd9 100644
    --- a/drivers/block/cciss.h
    +++ b/drivers/block/cciss.h
    @@ -173,7 +173,7 @@ static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c)
    printk("Sending %x - down to controller\n", 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;
    --
    1.7.9.6


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