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usb: musb: sunxi: Fix NULL ptr deref when gadget is registered before musb 

Stop using the return value of platform_device_register_full() to get to
the struct musb in sunxi_musb_work(). If a gadget has been registered
(insmod-ed) before the musb driver, then musb_start will get called
from the musb_core probe function and sunxi_musb_work() may run before
platform_device_register_full() has returned.

Instead store a pointer to struct musb in struct sunxi_glue when
sunxi_musb_enable gets called. Note that sunxi_musb_enable always gets
called before sunxi_musb_work() can run.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[b-liu@ti.com: revise subject prefix]
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2016-06-14 15:13:05 -05:00 коммит произвёл Greg Kroah-Hartman
Родитель e4600d5632
Коммит 969a132723
1 изменённых файлов: 9 добавлений и 6 удалений
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15
drivers/usb/musb/sunxi.c
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@ -80,7 +80,8 @@ static struct musb *sunxi_musb;
struct sunxi_glue {
struct device *dev;
struct platform_device *musb;
struct musb *musb;
struct platform_device *musb_pdev;
struct clk *clk;
struct reset_control *rst;
struct phy *phy;
@ -102,7 +103,7 @@ static void sunxi_musb_work(struct work_struct *work)
return;
if (test_and_clear_bit(SUNXI_MUSB_FL_HOSTMODE_PEND, &glue->flags)) {
struct musb *musb = platform_get_drvdata(glue->musb);
struct musb *musb = glue->musb;
unsigned long flags;
u8 devctl;
@ -337,6 +338,8 @@ static void sunxi_musb_enable(struct musb *musb)
{
struct sunxi_glue *glue = dev_get_drvdata(musb->controller->parent);
glue->musb = musb;
/* musb_core does not call us in a balanced manner */
if (test_and_set_bit(SUNXI_MUSB_FL_ENABLED, &glue->flags))
return;
@ -732,9 +735,9 @@ static int sunxi_musb_probe(struct platform_device *pdev)
pinfo.data = &pdata;
pinfo.size_data = sizeof(pdata);
glue->musb = platform_device_register_full(&pinfo);
if (IS_ERR(glue->musb)) {
ret = PTR_ERR(glue->musb);
glue->musb_pdev = platform_device_register_full(&pinfo);
if (IS_ERR(glue->musb_pdev)) {
ret = PTR_ERR(glue->musb_pdev);
dev_err(&pdev->dev, "Error registering musb dev: %d\n", ret);
goto err_unregister_usb_phy;
}
@ -751,7 +754,7 @@ static int sunxi_musb_remove(struct platform_device *pdev)
struct sunxi_glue *glue = platform_get_drvdata(pdev);
struct platform_device *usb_phy = glue->usb_phy;
platform_device_unregister(glue->musb); /* Frees glue ! */
platform_device_unregister(glue->musb_pdev); /* Frees glue ! */
usb_phy_generic_unregister(usb_phy);
return 0;