Re: [PATCH] usb: chipidea: tegra: fix hardlock with invalid dr mode

[Greg KH <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>]

On Sun, Jan 26, 2020 at 09:35:48PM -0500, Peter Geis wrote:
> The ci_hdrc_tegra driver does not currently support dual role mode, but
> it does not explicitly prevent its use.
> Certain devices support dual role mode, but not automatic role switch.
> This can cause the device to lock up during initialization of the
> driver.
> 
> Detect this state by checking for the extcon phandle when dual role mode
> is set to otg.
> If it doesn't exist request the driver to only enable manual role
> switching.
> 
> Fixes: dfebb5f ("usb: chipidea: Add support for Tegra20/30/114/124")

Please use 12 digits for kernel sha1 values, this should be:
Fixes: dfebb5f43a78 ("usb: chipidea: Add support for Tegra20/30/114/124")

As proof of the need of this, just using the values you gave here causes
git to complain:

$ git show dfebb5f
error: short SHA1 dfebb5f is ambiguous
hint: The candidates are:
hint:   dfebb5f43a78 commit 2017-08-16 - usb: chipidea: Add support for Tegra20/30/114/124
hint:   dfebb5fec744 tree
fatal: ambiguous argument 'dfebb5f': unknown revision or path not in the working tree.

thanks,

greg k-h