cciss: do not attempt to read from a write-only register

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: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index b8901fff9f8c788fa72f5e4cd49297f6563b11d0..658b6174b440811a01f04699fea74eb86254fbf3 100644 (file)
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -181,7 +181,7 @@ 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;