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    SubjectRe: musb as module broken in 2.6.38
    Am 16.03.2011 10:55, schrieb Felipe Balbi:
    > On Wed, Mar 16, 2011 at 10:47:21AM +0100, Alexander Holler wrote:
    >> ------------
    >> beagle linux # grep -i MUSB .config
    >> CONFIG_USB_MUSB_HDRC=m
    >> # CONFIG_USB_MUSB_TUSB6010 is not set
    >> CONFIG_USB_MUSB_OMAP2PLUS=y
    >> # CONFIG_USB_MUSB_AM35X is not set
    >> # CONFIG_USB_MUSB_HOST is not set
    >> # CONFIG_USB_MUSB_PERIPHERAL is not set
    >> CONFIG_USB_MUSB_OTG=y
    >> CONFIG_USB_GADGET_MUSB_HDRC=y
    >> CONFIG_USB_MUSB_HDRC_HCD=y
    >> # CONFIG_MUSB_PIO_ONLY is not set
    >> CONFIG_USB_MUSB_DEBUG=y
    >> beagle linux # modprobe musb_hdrc
    >> FATAL: Error inserting musb_hdrc (/lib/modules/2.6.38-beagleboard-00002-g0017ea0-dirty/kernel/drivers/usb/musb/musb_hdrc.ko):
    >> No such device
    >> beagle linux # tail -n 1 /var/log/messages
    >> Mar 16 10:37:51 beagle kernel: [ 177.302825] musb-hdrc: version 6.0,
    >> musb-dma, otg (peripheral+host), debug=5
    >> beagle linux # ls /sys/devices/platform/ | grep musb
    >> musb-omap2430
    >> ------------
    >>
    >> The problem in detail:
    >>
    >> Through modprobe musb_core.c:musb_init() is called, and this calls
    >> platform_driver_probe() with a pointer to a struct of platform_device
    >> where the name is musb-hdrc.
    >> drivers/base/platform.c:platform_driver_probe() fails with -ENODEV
    >> because it doesn't find a platform device with the name musb-hdrc
    >> (list_empty()) which is understandable because the platform-device
    >> has the name musb-omap2430.
    >
    > look further, omap2430.c allocates musb-hdrc platform_device. The
    > problem is a different one.
    >
    > static int __init omap2430_probe(struct platform_device *pdev)

    Neither omap2430_init() nor omap2430_probe() will be called here.

    Regards,

    Alexander Holler


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