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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2010-09-29 10:54:29 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 21:21:58 +0400
commitf405387435a85a440d1ce16f3ca36e042281643a (patch)
treea92a1723beca4c3bc350f1c9e3843c98eaf0a9ce /drivers/usb/musb
parent230f7ede6c2f0e403f29e03e0251a470aa9350dd (diff)
downloadlinux-f405387435a85a440d1ce16f3ca36e042281643a.tar.xz
USB: MUSB: fix kernel WARNING/oops when unloading module in OTG mode
Since commit 461972d8a4c94bc44f11a13046041c78a7cf18dd (musb_core: don't call musb_platform_exit() twice), unloading the driver module results in a WARNING "kobject: '(null)' (c73de788): is not initialized, yet kobject_put() is being called." (or even kernel oops) on e.g. DaVincis, though only in the OTG mode. There exists dubious and unbalanced put_device() call in musb_free() which takes place only in the OTG mode. As this commit caused musb_platform_exit() to be called (and so unregister the NOP transceiver) before this put_device() call, this function references already freed memory. On the other hand, all the glue layers miss the otg_put_transceiver() call, complementary to the otg_get_transceiver() call that they do. So, I think the solution is to get rid of the strange put_device() call, and instead call otg_put_transceiver() in the glue layers... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: stable <stable@kernel.org> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb')
-rw-r--r--drivers/usb/musb/blackfin.c1
-rw-r--r--drivers/usb/musb/davinci.c2
-rw-r--r--drivers/usb/musb/musb_core.c4
-rw-r--r--drivers/usb/musb/omap2430.c1
-rw-r--r--drivers/usb/musb/tusb6010.c4
5 files changed, 8 insertions, 4 deletions
diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c
index b611420a8050..9733fe9b597a 100644
--- a/drivers/usb/musb/blackfin.c
+++ b/drivers/usb/musb/blackfin.c
@@ -397,5 +397,6 @@ int musb_platform_exit(struct musb *musb)
gpio_free(musb->config->gpio_vrsel);
+ otg_put_transceiver(musb->xceiv);
return 0;
}
diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index 57624361c1de..6e67629f50cc 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -446,6 +446,7 @@ int __init musb_platform_init(struct musb *musb, void *board_data)
fail:
clk_disable(musb->clock);
+ otg_put_transceiver(musb->xceiv);
usb_nop_xceiv_unregister();
return -ENODEV;
}
@@ -496,6 +497,7 @@ int musb_platform_exit(struct musb *musb)
clk_disable(musb->clock);
+ otg_put_transceiver(musb->xceiv);
usb_nop_xceiv_unregister();
return 0;
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 472b2a7e7896..7e2c353755d2 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1926,10 +1926,6 @@ static void musb_free(struct musb *musb)
dma_controller_destroy(c);
}
-#ifdef CONFIG_USB_MUSB_OTG
- put_device(musb->xceiv->dev);
-#endif
-
#ifdef CONFIG_USB_MUSB_HDRC_HCD
usb_put_hcd(musb_to_hcd(musb));
#else
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 2111a241dd03..ed618bde1eec 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -320,5 +320,6 @@ int musb_platform_exit(struct musb *musb)
musb_platform_suspend(musb);
+ otg_put_transceiver(musb->xceiv);
return 0;
}
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 3c48e77a0aa2..bde40efc7046 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -1152,6 +1152,8 @@ done:
if (ret < 0) {
if (sync)
iounmap(sync);
+
+ otg_put_transceiver(musb->xceiv);
usb_nop_xceiv_unregister();
}
return ret;
@@ -1166,6 +1168,8 @@ int musb_platform_exit(struct musb *musb)
musb->board_set_power(0);
iounmap(musb->sync_va);
+
+ otg_put_transceiver(musb->xceiv);
usb_nop_xceiv_unregister();
return 0;
}