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authorAlan Stern <stern@rowland.harvard.edu>2016-08-05 18:49:45 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-09 16:45:59 +0300
commitca5cbc8b02f9b21cc8cd1ab36668763ec34f9ee8 (patch)
tree0976c55e7e133a4f70eca694e3e86eb493745f10 /drivers/usb/core
parent6bb47e8ab98accb1319bd43c64966340ba3bba9a (diff)
downloadlinux-ca5cbc8b02f9b21cc8cd1ab36668763ec34f9ee8.tar.xz
USB: hub: fix up early-exit pathway in hub_activate
The early-exit pathway in hub_activate, added by commit e50293ef9775 ("USB: fix invalid memory access in hub_activate()") needs improvement. It duplicates code that is already present at the end of the subroutine, and it neglects to undo the effect of a usb_autopm_get_interface_no_resume() call. This patch fixes both problems by making the early-exit pathway jump directly to the end of the subroutine. It simplifies the code at the end by merging two conditionals that actually test the same condition although they appear different: If type < HUB_INIT3 then type must be either HUB_INIT2 or HUB_INIT, and it can't be HUB_INIT because in that case the subroutine would have exited earlier. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: <stable@vger.kernel.org> #4.4+ Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/hub.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 3ccffac0f647..bb69d262b6f9 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1055,11 +1055,8 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
device_lock(hub->intfdev);
/* Was the hub disconnected while we were waiting? */
- if (hub->disconnected) {
- device_unlock(hub->intfdev);
- kref_put(&hub->kref, hub_release);
- return;
- }
+ if (hub->disconnected)
+ goto disconnected;
if (type == HUB_INIT2)
goto init2;
goto init3;
@@ -1281,12 +1278,12 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
/* Scan all ports that need attention */
kick_hub_wq(hub);
- /* Allow autosuspend if it was suppressed */
- if (type <= HUB_INIT3)
+ if (type == HUB_INIT2 || type == HUB_INIT3) {
+ /* Allow autosuspend if it was suppressed */
+ disconnected:
usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
-
- if (type == HUB_INIT2 || type == HUB_INIT3)
device_unlock(hub->intfdev);
+ }
kref_put(&hub->kref, hub_release);
}