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references to it. This is the functional equivalent to change r237518, which added this functionality to the cd(4) and da(4) drivers. This fix prevents a panic caused by GEOM calling adaopen() while the device is going away. We now keep the device around until GEOM has finished cleaning up its state. ata_da.c: In adaregister(), add a d_gone callback to the GEOM disk structure registered for the ada driver. Increment the peripheral reference count for GEOM. Add a new callback, adadiskgonecb(), that GEOM calls when it is done with its resources. This callback releases the reference acquired in adaregister(). Submitted by: Po-Li Soong Sponsored by: Spectra Logic MFC After: 5 days
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