From 4145ba76b1f7f3296cc673c299084145e1267029 Mon Sep 17 00:00:00 2001 From: Tim Sell Date: Fri, 8 Apr 2016 09:21:10 -0400 Subject: [PATCH] staging: unisys: visornic: prevent double-unlock of priv_lock Previously, devdata->priv_lock was being unlocked in visornic_serverdown() both before calling visornic_serverdown_complete(), then again at the end of the function. This bug was corrected. The structure of visornic_serverdown() was also improved to make it easier to follow and to decrease the chance that such bugs will be introduced again. The main-path logic now falls thru down the left-side of the page, with a common error-exit point to handle error conditions. Signed-off-by: Tim Sell Signed-off-by: David Kershner Signed-off-by: Greg Kroah-Hartman --- drivers/staging/unisys/visornic/visornic_main.c | 40 +++++++++++++++---------- 1 file changed, 25 insertions(+), 15 deletions(-) diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c index 763738d..0ec952a 100644 --- a/drivers/staging/unisys/visornic/visornic_main.c +++ b/drivers/staging/unisys/visornic/visornic_main.c @@ -356,28 +356,38 @@ visornic_serverdown(struct visornic_devdata *devdata, visorbus_state_complete_func complete_func) { unsigned long flags; + int err; spin_lock_irqsave(&devdata->priv_lock, flags); - if (!devdata->server_down && !devdata->server_change_state) { - if (devdata->going_away) { - spin_unlock_irqrestore(&devdata->priv_lock, flags); - dev_dbg(&devdata->dev->device, - "%s aborting because device removal pending\n", - __func__); - return -ENODEV; - } - devdata->server_change_state = true; - devdata->server_down_complete_func = complete_func; - spin_unlock_irqrestore(&devdata->priv_lock, flags); - visornic_serverdown_complete(devdata); - } else if (devdata->server_change_state) { + if (devdata->server_change_state) { dev_dbg(&devdata->dev->device, "%s changing state\n", __func__); - spin_unlock_irqrestore(&devdata->priv_lock, flags); - return -EINVAL; + err = -EINVAL; + goto err_unlock; + } + if (devdata->server_down) { + dev_dbg(&devdata->dev->device, "%s already down\n", + __func__); + err = -EINVAL; + goto err_unlock; } + if (devdata->going_away) { + dev_dbg(&devdata->dev->device, + "%s aborting because device removal pending\n", + __func__); + err = -ENODEV; + goto err_unlock; + } + devdata->server_change_state = true; + devdata->server_down_complete_func = complete_func; spin_unlock_irqrestore(&devdata->priv_lock, flags); + + visornic_serverdown_complete(devdata); return 0; + +err_unlock: + spin_unlock_irqrestore(&devdata->priv_lock, flags); + return err; } /** -- 2.7.4