linux-kernel - RE: [PATCH 2/3] PCI: hv: Add hv_pci_remove

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Message-ID: <DM5PR2101MB09184F9359B300EEF04C5728D7410@DM5PR2101MB0918.namprd21.prod.outlook.com>
Date:   Wed, 20 Mar 2019 21:38:55 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "jackm@...lanox.com" <jackm@...lanox.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 2/3] PCI: hv: Add hv_pci_remove_slots() when we unload the
 driver

From: Dexuan Cui <decui@...rosoft.com> Sent: Monday, March 4, 2019 1:35 PM
> 
> When we unload pci-hyperv, the host doesn't send us a PCI_EJECT message.
> In this case we also need to make sure the sysfs pci slot directory
> is removed, otherwise "cat /sys/bus/pci/slots/2/address" will trigger
> "BUG: unable to handle kernel paging request" (I noticed the issue when
> systemd-dev crashed for me when I unloaded the driver). And, if we
> unload/reload the driver several times, we'll have multiple pci slot
> directories in /sys/bus/pci/slots/ like this:
> 
> root@...alhost:~# ls -rtl  /sys/bus/pci/slots/
> total 0
> drwxr-xr-x 2 root root 0 Feb  7 10:49 2
> drwxr-xr-x 2 root root 0 Feb  7 10:49 2-1
> drwxr-xr-x 2 root root 0 Feb  7 10:51 2-2
> 
> The patch adds the missing code.
> 
> Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information")
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> Acked-by: Stephen Hemminger <sthemmin@...rosoft.com>
> Cc: stable@...r.kernel.org

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>