Is IBAL passing some IRP down without doing the proper cleanup first? >-----Original Message----- >From: [email protected] [mailto:ofw- >[email protected]] On Behalf Of Leonid Keller >Sent: Wednesday, September 02, 2009 2:01 AM >To: Smith, Stan; Tzachi Dar >Cc: ofw_list >Subject: [ofw] RE: When one can release CA interface > > see inline > >> -----Original Message----- >> From: Smith, Stan [mailto:[email protected]] >> Sent: Tuesday, September 01, 2009 9:06 PM >> To: Leonid Keller; Tzachi Dar >> Cc: ofw_list >> Subject: RE: When one can release CA interface >> >> Leonid Keller wrote: >> > I don't quite understand that. >> > If CA has been deregistered, i.e. ib_deregister_ca() has >> been called, >> > there is more CI_CA object. >> > All resources (PDs, CQs, QPs) are released. >> > How can IBAL send to CA MADs ? >> >> The CI_CA object still exists due to the reference still held >> on the HCA. >Did you see that for real ? > >Technically, CI_CA is created as a synchronic object (see in >create_ci_ca) > > init_al_obj( &p_ci_ca->obj, p_ci_ca, FALSE, > destroying_ci_ca, cleanup_ci_ca, free_ci_ca ); > >and when ib_deregister_ca() exits, CI_CA should be fully destroyed. > >>From the design point of view, deregister_ca is a function of IBAL low >interface. >It is to be called by HCA low-level driver upon card ejecting. >In other words, there is no HCA card after returning from this function >! > >Am I missing something ? > > >> >> > >> > >> >> -----Original Message----- >> >> From: Smith, Stan [mailto:[email protected]] >> >> Sent: Tuesday, September 01, 2009 7:29 PM >> >> To: Leonid Keller; Tzachi Dar >> >> Cc: ofw_list >> >> Subject: RE: When one can release CA interface >> >> >> >> Leonid Keller wrote: >> >>> fdo_release_resources() in bus_pnp.c releases the last interface >> >>> with low-level driver only after IBAL cleanup with the following >> >>> explanation: >> >>> >> >>> /* AL needs the HCA to stick around until AL cleanup has >> completed. >> >>> ... */ >> >>> >> >>> My question is - why ? >> >>> How may/can IBAL proceed to work with HCA after CA has been >> >>> deregistered ? What kind of works could be still pending ? >> >> >> >> >> >> IBAL MAD processing threads may be in process of forwarding a MAD >> >> and/or MAD processing with the outcome of eventually accessing the >> >> HCA device. If the HCA is remove before AL shutdown.....boom! >> >> >_______________________________________________ >ofw mailing list >[email protected] >http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ofw
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