USB: set device dma_mask without reference to global data

Many USB host drivers contain code such as:

if (!pdev->dev.dma_mask)
        pdev->dev.dma_mask = &tegra_ehci_dma_mask;

... where tegra_ehci_dma_mask is a global. I suspect this code originated
in commit 4a53f4e "USB: ehci-tegra: add probing through device tree" and
was simply copied everywhere else.

This works fine when the code is built-in, but can cause a crash when the
code is in a module. The first module load sets up the dma_mask pointer,
but if the module is removed and re-inserted, the value is now non-NULL,
and hence is not updated to point at the new location, and hence points
at a stale location within the previous module load address, which in
turn causes a crash if the pointer is de-referenced.

The simplest way of solving this seems to be to copy the code from
ehci-platform.c, which uses the coherent_dma_mask as the target for the
dma_mask pointer.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

12 files changed, 34 insertions, 38 deletions

diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index 66420097c242..02f4611faa62 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -63,8 +63,6 @@ static void atmel_stop_ehci(struct platform_device *pdev)
 
 /*-------------------------------------------------------------------------*/
 
-static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
-
 static int ehci_atmel_drv_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd;
@@ -93,7 +91,9 @@ static int ehci_atmel_drv_probe(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &at91_ehci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 	if (!hcd) {
diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index 3d1491b5f360..16d7150e8557 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -90,8 +90,6 @@ static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
 	.extra_priv_size = sizeof(struct omap_hcd),
 };
 
-static u64 omap_ehci_dma_mask = DMA_BIT_MASK(32);
-
 /**
  * ehci_hcd_omap_probe - initialize TI-based HCDs
  *
@@ -146,8 +144,10 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
 	 * Since shared usb code relies on it, set it here for now.
 	 * Once we have dma capability bindings this can go away.
 	 */
-	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &omap_ehci_dma_mask;
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+	if (!dev->coherent_dma_mask)
+		dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
 	hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
 			dev_name(dev));
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 54c579485150..efbc588b48c5 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -137,8 +137,6 @@ ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
 	}
 }
 
-static u64 ehci_orion_dma_mask = DMA_BIT_MASK(32);
-
 static int ehci_orion_drv_probe(struct platform_device *pdev)
 {
 	struct orion_ehci_data *pd = pdev->dev.platform_data;
@@ -183,7 +181,9 @@ static int ehci_orion_drv_probe(struct platform_device *pdev)
 	 * now. Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &ehci_orion_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	if (!request_mem_region(res->start, resource_size(res),
 				ehci_orion_hc_driver.description)) {
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index 635775278c7f..a81465ed48db 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -71,8 +71,6 @@ static void s5p_setup_vbus_gpio(struct platform_device *pdev)
 		dev_err(dev, "can't request ehci vbus gpio %d", gpio);
 }
 
-static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
-
 static int s5p_ehci_probe(struct platform_device *pdev)
 {
 	struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
@@ -90,7 +88,7 @@ static int s5p_ehci_probe(struct platform_device *pdev)
 	 * Once we move to full device tree support this will vanish off.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &ehci_s5p_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 	if (!pdev->dev.coherent_dma_mask)
 		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index 61ecfb3d52f5..bd3e5cbc6240 100644
--- a/drivers/usb/host/ehci-spear.c
+++ b/drivers/usb/host/ehci-spear.c
@@ -58,8 +58,6 @@ static int ehci_spear_drv_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
 		ehci_spear_drv_resume);
 
-static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
-
 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd ;
@@ -84,7 +82,9 @@ static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &spear_ehci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	usbh_clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(usbh_clk)) {
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index e3eddc31ac83..59d111bf44a9 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -637,8 +637,6 @@ static void tegra_ehci_set_phcd(struct usb_phy *x, bool enable)
 	writel(val, base + TEGRA_USB_PORTSC1);
 }
 
-static u64 tegra_ehci_dma_mask = DMA_BIT_MASK(32);
-
 static int tegra_ehci_probe(struct platform_device *pdev)
 {
 	struct resource *res;
@@ -661,7 +659,9 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &tegra_ehci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	setup_vbus_gpio(pdev, pdata);
 
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index a0cb44f0e724..2ee1496dbc1d 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -504,8 +504,6 @@ static const struct of_device_id at91_ohci_dt_ids[] = {
 
 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 
-static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
-
 static int ohci_at91_of_init(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -522,7 +520,9 @@ static int ohci_at91_of_init(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &at91_ohci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index 07592c00af26..b0b542c14e31 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -98,8 +98,6 @@ static const struct hc_driver exynos_ohci_hc_driver = {
 	.start_port_reset	= ohci_start_port_reset,
 };
 
-static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
-
 static int exynos_ohci_probe(struct platform_device *pdev)
 {
 	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
@@ -117,7 +115,7 @@ static int exynos_ohci_probe(struct platform_device *pdev)
 	 * Once we move to full device tree support this will vanish off.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &ohci_exynos_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 	if (!pdev->dev.coherent_dma_mask)
 		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
diff --git a/drivers/usb/host/ohci-omap3.c b/drivers/usb/host/ohci-omap3.c
index ddfc31427bc0..8663851c8d8e 100644
--- a/drivers/usb/host/ohci-omap3.c
+++ b/drivers/usb/host/ohci-omap3.c
@@ -114,8 +114,6 @@ static const struct hc_driver ohci_omap3_hc_driver = {
 
 /*-------------------------------------------------------------------------*/
 
-static u64 omap_ohci_dma_mask = DMA_BIT_MASK(32);
-
 /*
  * configure so an HC device and id are always provided
  * always called with process context; sleeping is OK
@@ -168,8 +166,10 @@ static int ohci_hcd_omap3_probe(struct platform_device *pdev)
 	 * Since shared usb code relies on it, set it here for now.
 	 * Once we have dma capability bindings this can go away.
 	 */
-	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &omap_ohci_dma_mask;
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+	if (!dev->coherent_dma_mask)
+		dev->coherent_dma_mask = DMA_BIT_MASK(32);
 
 	hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
 			dev_name(dev));
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index efe71f3ca477..279b2ef17411 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -282,8 +282,6 @@ static const struct of_device_id pxa_ohci_dt_ids[] = {
 
 MODULE_DEVICE_TABLE(of, pxa_ohci_dt_ids);
 
-static u64 pxa_ohci_dma_mask = DMA_BIT_MASK(32);
-
 static int ohci_pxa_of_init(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -298,7 +296,9 @@ static int ohci_pxa_of_init(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &pxa_ohci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
diff --git a/drivers/usb/host/ohci-spear.c b/drivers/usb/host/ohci-spear.c
index 9020bf0e2eca..3e19e0170d11 100644
--- a/drivers/usb/host/ohci-spear.c
+++ b/drivers/usb/host/ohci-spear.c
@@ -91,8 +91,6 @@ static const struct hc_driver ohci_spear_hc_driver = {
 	.start_port_reset	= ohci_start_port_reset,
 };
 
-static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32);
-
 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
 {
 	const struct hc_driver *driver = &ohci_spear_hc_driver;
@@ -114,7 +112,9 @@ static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &spear_ohci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	usbh_clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(usbh_clk)) {
diff --git a/drivers/usb/host/uhci-platform.c b/drivers/usb/host/uhci-platform.c
index 8c4dace4b14a..f1db61ada6a8 100644
--- a/drivers/usb/host/uhci-platform.c
+++ b/drivers/usb/host/uhci-platform.c
@@ -60,8 +60,6 @@ static const struct hc_driver uhci_platform_hc_driver = {
 	.hub_control =		uhci_hub_control,
 };
 
-static u64 platform_uhci_dma_mask = DMA_BIT_MASK(32);
-
 static int uhci_hcd_platform_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd;
@@ -78,7 +76,9 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
-		pdev->dev.dma_mask = &platform_uhci_dma_mask;
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
 	hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
 			pdev->name);