Date: Thu, 21 May 2009 19:28:25 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: Scott Long <scottl@samsco.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, attilio@freebsd.org, rwatson@freebsd.org, svn-src-head@freebsd.org, "M. Warner Losh" <imp@bsdimp.com> Subject: Re: svn commit: r192535 - head/sys/kern Message-ID: <20090521162825.GS1927@deviant.kiev.zoral.com.ua> In-Reply-To: <200905211223.55113.jhb@freebsd.org> References: <3bbf2fe10905210629p46c7a204v6863aaba77354462@mail.gmail.com> <200905211211.00168.jhb@freebsd.org> <20090521161535.GQ1927@deviant.kiev.zoral.com.ua> <200905211223.55113.jhb@freebsd.org>
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--MXXuyh5iveicsfl4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 21, 2009 at 12:23:54PM -0400, John Baldwin wrote: > On Thursday 21 May 2009 12:15:35 pm Kostik Belousov wrote: > > On Thu, May 21, 2009 at 12:10:59PM -0400, John Baldwin wrote: > > Another thing done inside destroy_dev is the call to the destructors > > of the cdevpriv data, that never had any restrictions on the sleepable > > context. > >=20 > > We do have the KPI for the callers that cannot drop the locks and need > > to do destroy_dev, destroy_dev_sched(9). >=20 > With the caveat that you can't make any assumptions about other threads i= n=20 > your cdevsw routines being finished when it returns. If you have per-dev= ice=20 > data structures you need to free that are not handled by cdevpriv then yo= u=20 > probably cannot safely free them. Yes, this is why it has callback to call after all threads are guaranteed to be off the methods code. --MXXuyh5iveicsfl4 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkoVgSkACgkQC3+MBN1Mb4i4rgCeO5JnHc4c+0HUlvjj068W5RGj njMAoO1l3ZSZsjNuIs2mf7ThY2VfuhmP =YJD0 -----END PGP SIGNATURE----- --MXXuyh5iveicsfl4--
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