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USB: MUSB: fix kernel WARNING/oops when unloading module in OTG mode 

Since commit 461972d8a4 (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>
This commit is contained in:
Sergei Shtylyov 2010-09-29 09:54:29 +03:00 committed by Greg Kroah-Hartman
parent 230f7ede6c
commit f405387435
5 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/musb/blackfin.c
View File

@ -397,5 +397,6 @@ int musb_platform_exit(struct musb *musb)
gpio_free(musb->config->gpio_vrsel);
otg_put_transceiver(musb->xceiv);
return 0;
}

2
drivers/usb/musb/davinci.c
View File

@ -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;

4
drivers/usb/musb/musb_core.c
View File

@ -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

1
drivers/usb/musb/omap2430.c
View File

@ -320,5 +320,6 @@ int musb_platform_exit(struct musb *musb)
musb_platform_suspend(musb);
otg_put_transceiver(musb->xceiv);
return 0;
}

4
drivers/usb/musb/tusb6010.c
View File

@ -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;
}