From: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Date: Sat, 9 Jul 2011 07:04:12 +0000 (+0200)
Subject: cciss: do not attempt to read from a write-only register
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=07d0c38e7d84f911c72058a124c7f17b3c779a65;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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

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
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 16b4d58d84dd..c049548e68b7 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;