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    SubjectRe: Oops in CDC ACM after an Openmoko phone (neo1973) changes its usb interface from ACM to Ethernet
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    On Sun, Aug 2, 2009 at 19:19, Oliver Neukum<oliver@neukum.org> wrote:
    > Am Sonntag, 2. August 2009 18:40:56 schrieb Alex Riesen:
    >> [   75.453444] Call Trace:
    >> [   75.453444]  [<ffffffff812a77b2>] usb_autopm_get_interface+0xe/0x10
    >> [   75.453444]  [<ffffffffa0072e19>] acm_port_down+0x3f/0x1bb [cdc_acm]
    >> [   75.453444]  [<ffffffff811f0af1>] ? tty_port_close_start+0xc1/0x153
    >> [   75.453444]  [<ffffffffa0073258>] acm_tty_close+0x3d/0x83 [cdc_acm]
    >> [   75.453444]  [<ffffffff811eaca7>] tty_release_dev+0x1bf/0x4e8
    >> [   75.453444]  [<ffffffffa00732c3>] ? acm_tty_open+0x25/0x2ae [cdc_acm]
    >
    > This can happen only if acm_port_down() fails to detect that the device has
    > been disconnected, as it calls usb_autopm_get_interface()
    > only if acm->dev != NULL.
    > This however should not happen if acm_disconnect runs.
    >
    > Can you put a printk into acm_disconnect and recompile with CONFIG_USB_DEBUG?

    I put the printks at some random lines in acm_disconnect (as of v2.6.31-rc2)
    and turned CONFIG_USB_DEBUG on. It is definitely not the same kernel
    I tried before (and sadly, it does not go oops), but it still has
    tty_port_close_start: count = -1
    Dmesg attached

    I'm retrying with recent kernels (hopefully I'll get enough data left
    on the screen),
    I shall try to find the -rc2 which oopses (I suspect it is the one
    just before -rc3).
    [unhandled content-type:application/octet-stream]
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