Date: Tue, 6 Jun 2006 14:01:08 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Jimmy Olgeni <olgeni@uli.it> Cc: freebsd-hackers@FreeBSD.org Subject: Re: bus_dmamap_load_uio and uiomove Message-ID: <20060606120108.GF74562@garage.freebsd.pl> In-Reply-To: <20060530143518.C36362@server.localdomain.net> References: <20060530143518.C36362@server.localdomain.net>
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[-- Attachment #1 --] On Tue, May 30, 2006 at 02:49:22PM +0200, Jimmy Olgeni wrote: +> +> Hello, +> +> Just quick busdma question... +> +> I'm currently upgrading a custom device driver to use bus_dmamap_load_uio rather than uiomove. Everything works fine, but calls to "write" fail unless I set uio->uio_resid +> to 0 by hand (as I'm not using uiomove anymore). +> +> Am I supposed to set uio_resid by hand when using bus_dmamap_load_uio, or is there a better way to signal that all the data in uio was used? From what I see, bus_dmamap_load_uio() is using uio_resid as the number of bytes to proceed, so it has to be set before the call. -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFEhW6EForvXbEpPzQRAlAcAJ0Ur51Nxqvyd6mwKbacKAirzQXqiQCglGzU CidF70hGu1FRcMaKANFi7GM= =qWgz -----END PGP SIGNATURE-----
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