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Commit 07d0c38e authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by Jens Axboe
Browse files

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: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>

Note: this is a regression caused by commit 1ddd5049
Cc: stable@kernel.org
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent a7e9357f

drivers/block/cciss.h

+1 −1
Original line number Diff line number Diff line
@@ -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;