From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrey Borzenkov Subject: HDIO_SCAN_HWIF causes hwif to "forget" PCI parent Date: Sat, 8 Apr 2006 00:30:06 +0400 Message-ID: <200604080030.07236.arvidjaar@mail.ru> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mx27.mail.ru ([194.67.23.63]:59397 "EHLO mx27.mail.ru") by vger.kernel.org with ESMTP id S964931AbWDGUaP (ORCPT ); Fri, 7 Apr 2006 16:30:15 -0400 Content-Disposition: inline Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-ide@vger.kernel.org Cc: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have notebook with ALi IDE interface: 00:04.0 IDE interface: ALi Corporation M5229 IDE (rev c3) One of scripts called on Mandriva during suspend/resume calls hdparm -U for hdc on suspend and hdparm -R on resume. Now, hdparm -U (HDIO_UNREGISTER_HWIF) completely wipes out hwif reinitializing it. It means, that also hwif->pci_dev is nulled. On hdparm -R (HDIO_SCAN_HWIF) it basically calls hwif_register without initializing pci_dev which means hdc appears in sysfs in different place: before lrwxrwxrwx 1 root root 0 Apr 7 23:53 /sys/block/hdc/device - -> ../../devices/pci0000:00/0000:00:04.0/ide1/1.0/ after lrwxrwxrwx 1 root root 0 Apr 7 23:53 /sys/block/hdc/device - -> ../../devices/ide1/1.0/ this slightly confuses udev that receives a new path and regenerates cdrom links (OK this is no more kernel problem but how I noticed it in the first place :) so what has been cdrom0 before suddenly becomes cdrom1. Looking at ide.c, I do not see any obvious ways to fix it. I appreciate any hint how this can be fixed; alternatively if libpata does not have this issue I am ready to test it. Thank you - -andrey -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFENsvPR6LMutpd94wRAjFNAJ0VsKOZZOKn6/SIilrblrXuj4eGhgCePEnm VP+KZQOGbpye9esLG6lSC/k= =VXbN -----END PGP SIGNATURE-----