From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Thu, 28 Oct 2010 14:06:21 +0000 Subject: [patch] rapidio: use resource_size() Message-Id: <20101028140621.GE6062@bicker> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Alexandre Bounine Cc: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Li Yang , Andrew Morton , linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org The size calculation is done incorrectly here because it should include both the start and end (end - start + 1). It's easiest to just use resource_size() which does the right thing. I was worried there was something non-standard going on because the printk() subtracts "end - 1", but the rest of the file uses the normal resource size calculations. This function is only called from fsl_rio_setup() in arch/powerpc/sysdev/fsl_rio.c and the calculation there is also: port->iores.start = law_start; port->iores.end = law_start + law_size - 1; So I think this is the correct fix. Signed-off-by: Dan Carpenter --- Compile tested only. diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index 68cf0c9..7b5080c 100644 --- a/drivers/rapidio/rio.c +++ b/drivers/rapidio/rio.c @@ -1159,11 +1159,11 @@ int __devinit rio_init_mports(void) list_for_each_entry(port, &rio_mports, node) { if (!request_mem_region(port->iores.start, - port->iores.end - port->iores.start, + resource_size(&port->iores), port->name)) { printk(KERN_ERR "RIO: Error requesting master port region 0x%016llx-0x%016llx\n", - (u64)port->iores.start, (u64)port->iores.end - 1); + (u64)port->iores.start, (u64)port->iores.end); rc = -ENOMEM; goto out; }