linux-kernel - ioremap warning fix for jsm driver.

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Message-ID: <20110601183841.GJ21345@caffeine.csclub.uwaterloo.ca>
Date:	Wed, 1 Jun 2011 14:38:41 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	linux-serial@...r.kernel.org
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Sorensen <lsorense@...lub.uwaterloo.ca>
Subject: ioremap warning fix for jsm driver.

I saw a warning about ioremap from the jsm driver on a system which
looked like this:

resource map sanity check conflict: 0xe0200800 0xe02017ff 0xe0200800 0xe0200fff 0000:01:08.0

Turns out the warning is valid.  The jsm driver has been asking to ioremap
0x1000 forever, but in fact only 8 port chips have 0x1000 bytes of memory.
4 port chips have 0x800 and 2 port chips have 0x400 according to the
data sheet.  It makes more sense to map the size of the region rather
than a hard coded value.  If you happen to have the regiong legitimately
mapped to a base addres that is not 4K aligned, ioremap complains
otherwise.

Signed-off-by: Len Sorensen <lsorense@...lub.uwaterloo.ca>


diff --git a/drivers/tty/serial/jsm/jsm_driver.c b/drivers/tty/serial/jsm/jsm_driver.c
index 18f5484..96da178 100644
--- a/drivers/tty/serial/jsm/jsm_driver.c
+++ b/drivers/tty/serial/jsm/jsm_driver.c
@@ -125,7 +125,7 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device
 	brd->bd_uart_offset = 0x200;
 	brd->bd_dividend = 921600;
 
-	brd->re_map_membase = ioremap(brd->membase, 0x1000);
+	brd->re_map_membase = ioremap(brd->membase, pci_resource_len(pdev, 0));
 	if (!brd->re_map_membase) {
 		dev_err(&pdev->dev,
 			"card has no PCI Memory resources, "


-- 
Len Sorensen
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