linux-kernel - [PATCH 3.11 214/272] usb: musb: davinci: fix resources passed to MUSB driver for DM6467

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Date:	Fri,  6 Dec 2013 12:58:23 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Felipe Balbi <balbi@...com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 214/272] usb: musb: davinci: fix resources passed to MUSB driver for DM6467

3.11.10.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

commit ea78201e2e08f8a91e30100c4c4a908b5cf295fc upstream.

After commit 09fc7d22b024692b2fe8a943b246de1af307132b (usb: musb: fix incorrect
usage of  resource pointer), CPPI DMA driver on DaVinci DM6467 can't detect its
dedicated IRQ and so the MUSB IRQ  is erroneously used instead. This is because
only 2 resources are passed to the MUSB driver from the DaVinci glue layer,  so
fix  this by always copying 3 resources (it's  safe since a placeholder for the
3rd resource is always  there) and passing 'pdev->num_resources' instead of the
size of musb_resources[] to platform_device_add_resources().

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Felipe Balbi <balbi@...com>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/usb/musb/davinci.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index f8aeaf2..f71db09 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -509,7 +509,7 @@ static u64 davinci_dmamask = DMA_BIT_MASK(32);
 
 static int davinci_probe(struct platform_device *pdev)
 {
-	struct resource musb_resources[2];
+	struct resource			musb_resources[3];
 	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
 	struct platform_device		*musb;
 	struct davinci_glue		*glue;
@@ -567,6 +567,15 @@ static int davinci_probe(struct platform_device *pdev)
 	musb_resources[1].end = pdev->resource[1].end;
 	musb_resources[1].flags = pdev->resource[1].flags;
 
+	/*
+	 * For DM6467 3 resources are passed. A placeholder for the 3rd
+	 * resource is always there, so it's safe to always copy it...
+	 */
+	musb_resources[2].name = pdev->resource[2].name;
+	musb_resources[2].start = pdev->resource[2].start;
+	musb_resources[2].end = pdev->resource[2].end;
+	musb_resources[2].flags = pdev->resource[2].flags;
+
 	ret = platform_device_add_resources(musb, musb_resources,
 			ARRAY_SIZE(musb_resources));
 	if (ret) {
-- 
1.8.3.2

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