From d9bca4358286584cc22f4261ee3a60cad01aa4d4 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Mon, 13 Sep 2010 10:11:05 +0000 Subject: [PATCH] x86/hwmon: avoid deadlock on CPU removal in pkgtemp pkgtemp_device_remove(), holding the list protecting mutex, calls pkgtemp_device_add(), which itself wants to acquire the same mutex. Holding the mutex over the entire loop body in pkgtemp_device_remove() isn't really necessary, as long as the loop gets exited after processing the matched CPU. Once exiting the loop after removing an eventual match, there's no need for using the "safe" list iterator anymore. Signed-off-by: Jan Beulich Cc: Fenghua Yu Signed-off-by: Guenter Roeck --- drivers/hwmon/pkgtemp.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/pkgtemp.c b/drivers/hwmon/pkgtemp.c index 74157fcda6e..844957333fe 100644 --- a/drivers/hwmon/pkgtemp.c +++ b/drivers/hwmon/pkgtemp.c @@ -339,17 +339,18 @@ exit: #ifdef CONFIG_HOTPLUG_CPU static void pkgtemp_device_remove(unsigned int cpu) { - struct pdev_entry *p, *n; + struct pdev_entry *p; unsigned int i; int err; mutex_lock(&pdev_list_mutex); - list_for_each_entry_safe(p, n, &pdev_list, list) { + list_for_each_entry(p, &pdev_list, list) { if (p->cpu != cpu) continue; platform_device_unregister(p->pdev); list_del(&p->list); + mutex_unlock(&pdev_list_mutex); kfree(p); for_each_cpu(i, cpu_core_mask(cpu)) { if (i != cpu) { @@ -358,7 +359,7 @@ static void pkgtemp_device_remove(unsigned int cpu) break; } } - break; + return; } mutex_unlock(&pdev_list_mutex); } -- 2.20.1