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

From: Stephen M. Cameron
Date: Thu Jul 21 2011 - 14:16:11 EST

From: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxx>
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);
if ( h->commands_outstanding > h->max_outstanding)
h->max_outstanding = h->commands_outstanding;

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