From fd1452ebf257317f24e0e285a17a2ec2ce3e6df7 Mon Sep 17 00:00:00 2001 From: Dmitry Adamushko <dmitry.adamushko@gmail.com> Date: Thu, 2 Oct 2008 16:56:19 +0300 Subject: [PATCH] x86/microcode: fix sleeping function called from invalid context at kernel/mutex.c Fix the following "sleeping function called from invalid context" bug: ... __might_sleep mutex_lock_nested microcode_update_cpu mc_sysdev_resume __sysdev_resume sysdev_resume device_power_up ... Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> --- arch/x86/kernel/microcode_core.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c index 8db2eb55e9e2f..936d8d55f2301 100644 --- a/arch/x86/kernel/microcode_core.c +++ b/arch/x86/kernel/microcode_core.c @@ -324,10 +324,6 @@ void microcode_update_cpu(int cpu) struct ucode_cpu_info *uci = ucode_cpu_info + cpu; int err = 0; - /* We should bind the task to the CPU */ - BUG_ON(raw_smp_processor_id() != cpu); - - mutex_lock(µcode_mutex); /* * Check if the system resume is in progress (uci->valid != NULL), * otherwise just request a firmware: @@ -340,11 +336,8 @@ void microcode_update_cpu(int cpu) err = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev); } - if (!err) microcode_ops->apply_microcode(cpu); - - mutex_unlock(µcode_mutex); } static void microcode_init_cpu(int cpu) @@ -352,7 +345,13 @@ static void microcode_init_cpu(int cpu) cpumask_t old = current->cpus_allowed; set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu)); + /* We should bind the task to the CPU */ + BUG_ON(raw_smp_processor_id() != cpu); + + mutex_lock(µcode_mutex); microcode_update_cpu(cpu); + mutex_unlock(µcode_mutex); + set_cpus_allowed_ptr(current, &old); } -- GitLab