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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-13 14:03:06 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-13 14:03:06 -0800 |
| commit | 8634c422c1b7e50ca8e346f65afc140d93a3212c (patch) | |
| tree | e0c5ce1f9a9606b93df20d729ae424c75e3dab67 | |
| parent | c41d9663252e766e65cc06b82618c11ecf697acb (diff) | |
| download | blackbird-op-linux-8634c422c1b7e50ca8e346f65afc140d93a3212c.tar.gz blackbird-op-linux-8634c422c1b7e50ca8e346f65afc140d93a3212c.zip | |
Revert "pci: use device_remove_file_self() instead of device_schedule_callback()"
This reverts commit 6716d289c437ad42dee455d241b29b71a816fbff.
Tejun writes:
I'm sorry but can you please revert the whole series?
get_active() waiting while a node is deactivated has potential
to lead to deadlock and that deactivate/reactivate interface is
something fundamentally flawed and that cgroup will have to work
with the remove_self() like everybody else. IOW, I think the
first posting was correct.
Cc: Tejun Heo <tj@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 94d1cb819eb6..c91e6c18debc 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -352,20 +352,32 @@ static struct device_attribute dev_rescan_attr = __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store); +static void remove_callback(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + mutex_lock(&pci_remove_rescan_mutex); + pci_stop_and_remove_bus_device(pdev); + mutex_unlock(&pci_remove_rescan_mutex); +} + static ssize_t -remove_store(struct device *dev, struct device_attribute *attr, +remove_store(struct device *dev, struct device_attribute *dummy, const char *buf, size_t count) { + int ret = 0; unsigned long val; if (kstrtoul(buf, 0, &val) < 0) return -EINVAL; - if (val && device_remove_file_self(dev, attr)) { - mutex_lock(&pci_remove_rescan_mutex); - pci_stop_and_remove_bus_device(to_pci_dev(dev)); - mutex_unlock(&pci_remove_rescan_mutex); - } + /* An attribute cannot be unregistered by one of its own methods, + * so we have to use this roundabout approach. + */ + if (val) + ret = device_schedule_callback(dev, remove_callback); + if (ret) + count = ret; return count; } static struct device_attribute dev_remove_attr = __ATTR(remove, |
