diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2011-05-12 17:11:39 -0700 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2011-05-21 12:17:12 -0700 |
| commit | b9d320fcb6259baffaeaf93a5fce252cd09333d6 (patch) | |
| tree | c5372d704719ff2c6f7b8d2b6bb3c04901cde242 /drivers/pci/pci-sysfs.c | |
| parent | da7822e5ad71ec9b745b412639f1e5e0ba795a20 (diff) | |
PCI: add rescan to /sys/.../pci_bus/.../
After remove the device from /sys, we have to rescan all or
find out the bridge and access /sys../device/rescan there.
this patch add /sys/.../pci_bus/.../rescan. So user can rescan more easy.
that is more clean and easy to understand.
like after remove 0000:c4:00.0, you can rescan 0000:c4 directly.
-v2: According to Jesse, use function instead of exposing attr, so could hide
#ifdef in header file.
also add code to remove rescan file in remove path.
-v3: GregKH pointed out that we should use dev_attrs to avoid racing.
So add pcibus_attrs and make it to be member of pcibus_attrs.
-v4: Change name to pcibus_dev_attrs according to GregKH
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index f8deb3e380a2..c690abc0e5b8 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -318,6 +318,25 @@ remove_store(struct device *dev, struct device_attribute *dummy, count = ret; return count; } + +static ssize_t +dev_bus_rescan_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val; + struct pci_bus *bus = to_pci_bus(dev); + + if (strict_strtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + mutex_lock(&pci_remove_rescan_mutex); + pci_rescan_bus(bus); + mutex_unlock(&pci_remove_rescan_mutex); + } + return count; +} + #endif struct device_attribute pci_dev_attrs[] = { @@ -347,6 +366,13 @@ struct device_attribute pci_dev_attrs[] = { __ATTR_NULL, }; +struct device_attribute pcibus_dev_attrs[] = { +#ifdef CONFIG_HOTPLUG + __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store), +#endif + __ATTR_NULL, +}; + static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf) { |