diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2012-10-19 19:03:02 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-25 01:51:21 +0400 |
| commit | 969ddcfc95c9a1849114fb72466d2fdea70f1d48 (patch) | |
| tree | e5322bb7b06e99461d96bf1091cf74230e811714 /drivers/usb/core/devices.c | |
| parent | d39dbc8918be0e6bb850592e334203c9114c0e77 (diff) | |
| download | linux-969ddcfc95c9a1849114fb72466d2fdea70f1d48.tar.xz | |
USB: hub_for_each_child should skip unconnected ports
This patch (as1619) improves the interface to the "hub_for_each_child"
macro. The name clearly suggests that the macro iterates over child
devices; it does not suggest that the loop will also iterate over
unnconnected ports.
The patch changes the macro so that it will skip over unconnected
ports and iterate only the actual child devices. The two existing
call sites are updated to avoid testing for a NULL child pointer,
which is now unnecessary.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/devices.c')
| -rw-r--r-- | drivers/usb/core/devices.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c index f460de31acee..cbacea933b18 100644 --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -591,16 +591,14 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, /* Now look at all of this device's children. */ usb_hub_for_each_child(usbdev, chix, childdev) { - if (childdev) { - usb_lock_device(childdev); - ret = usb_device_dump(buffer, nbytes, skip_bytes, - file_offset, childdev, bus, - level + 1, chix - 1, ++cnt); - usb_unlock_device(childdev); - if (ret == -EFAULT) - return total_written; - total_written += ret; - } + usb_lock_device(childdev); + ret = usb_device_dump(buffer, nbytes, skip_bytes, + file_offset, childdev, bus, + level + 1, chix - 1, ++cnt); + usb_unlock_device(childdev); + if (ret == -EFAULT) + return total_written; + total_written += ret; } return total_written; } |