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| author | Alex Chiang <achiang@hp.com> | 2009-03-20 14:56:31 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 14:57:58 -0700 |
| commit | 705b1aaa823e800490f157cd9366ad8cff385f5f (patch) | |
| tree | 634ea8ba227a305074938f49c110fea8e68e8bb3 /drivers/pci/pci-sysfs.c | |
| parent | 3ed4fd96b3188406ac5357d9290bcffa08c65cf6 (diff) | |
| download | blackbird-op-linux-705b1aaa823e800490f157cd9366ad8cff385f5f.tar.gz blackbird-op-linux-705b1aaa823e800490f157cd9366ad8cff385f5f.zip | |
PCI: Introduce /sys/bus/pci/rescan
This interface allows the user to force a rescan of all PCI buses
in system, and rediscover devices that have been removed earlier.
pci_bus_attrs implementation from Trent Piepho.
Thanks to Vegard Nossum for discovering locking issues with the
sysfs interface.
Cc: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Alex Chiang <achiang@hp.com>
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 ec7a175dcbaf..be7468a5eb72 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -219,6 +219,32 @@ msi_bus_store(struct device *dev, struct device_attribute *attr, return count; } +#ifdef CONFIG_HOTPLUG +static DEFINE_MUTEX(pci_remove_rescan_mutex); +static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, + size_t count) +{ + unsigned long val; + struct pci_bus *b = NULL; + + if (strict_strtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + mutex_lock(&pci_remove_rescan_mutex); + while ((b = pci_find_next_bus(b)) != NULL) + pci_rescan_bus(b); + mutex_unlock(&pci_remove_rescan_mutex); + } + return count; +} + +struct bus_attribute pci_bus_attrs[] = { + __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store), + __ATTR_NULL +}; +#endif + struct device_attribute pci_dev_attrs[] = { __ATTR_RO(resource), __ATTR_RO(vendor), |
