On Thu, May 29, 2014 at 03:01:04PM +0800, Yijing Wang wrote:
> Kernel will WARN_ON(retval < 0) if device_attach() fail with
> error in pci_bus_add_device(). currently, all the kernel code
> to check pci_bus_add_device() return value only for printing
> warning message, no other actions. So we can remove the
> unnecessary checking codes.
If we remove all the checks of the return value, why wouldn't we convert it
to a void function? If we keep the return value, it seems like we're
saying "this function could fail someday," but we removing all the code
that would actually *check* for that failure.
If you convert it to void, please just squash them all into a single patch.
> Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
> ---
> drivers/pci/bus.c | 6 +-----
> drivers/pci/iov.c | 2 +-
> include/linux/pci.h | 2 +-
> 3 files changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index ba2bf55..f0efbee 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -266,16 +266,12 @@ void pci_bus_add_devices(const struct pci_bus *bus)
> {
> struct pci_dev *dev;
> struct pci_bus *child;
> - int retval;
>
> list_for_each_entry(dev, &bus->devices, bus_list) {
> /* Skip already-added devices */
> if (dev->is_added)
> continue;
> - retval = pci_bus_add_device(dev);
> - if (retval)
> - dev_err(&dev->dev, "Error adding device (%d)\n",
> - retval);
> + pci_bus_add_device(dev);
> }
>
> list_for_each_entry(dev, &bus->devices, bus_list) {
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index de7a747..cb6f247 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -106,7 +106,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
> pci_device_add(virtfn, virtfn->bus);
> mutex_unlock(&iov->dev->sriov->lock);
>
> - rc = pci_bus_add_device(virtfn);
> + pci_bus_add_device(virtfn);
> sprintf(buf, "virtfn%u", id);
> rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
> if (rc)
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 65f22e8..3c4c0cf 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -781,7 +781,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn);
> struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
> void pci_device_add(struct pci_dev *dev, struct pci_bus *bus);
> unsigned int pci_scan_child_bus(struct pci_bus *bus);
> -int __must_check pci_bus_add_device(struct pci_dev *dev);
> +int pci_bus_add_device(struct pci_dev *dev);
> void pci_read_bridge_bases(struct pci_bus *child);
> struct resource *pci_find_parent_resource(const struct pci_dev *dev,
> struct resource *res);
> --
> 1.7.1
>
>
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