Re: puzzle about the pci_add_child

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 11/29/05

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    Date: Mon, 28 Nov 2005 22:59:48 -0700 (MST)
To: fierykylin@gmail.com

    In message: <87ab37ab0511280850y1bca554n1da9b11c321be34b@mail.gmail.com>
                kylin <fierykylin@gmail.com> writes:
    : i am reading the pci code of freeBSD 53 ,and come to the puzzle of
    : pci_add_child.
    : 1
    : why should we =09pci_cfg_save(dinfo->cfg.dev, dinfo, 0); after we have
    : already fill the cfg in pci_read_device ?

    It hasn't been completely filled in by pci_read_device.

    : 2
    : what 's the purpose of the function couple
    : pci_cfg_save(dinfo->cfg.dev, dinfo, 0);
    : pci_cfg_restore(dinfo->cfg.dev, dinfo)
    : below is the function ,thank u

    Power state gets set to D0 as a side effect so that the device is live
    for the probe.

    Warner
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