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A single fix to the late microcode loading machinery which corrects 

the ordering of when new microcode is loaded from the fs, vs checking
 whether all CPUs are online.
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Merge tag 'x86_microcode_for_v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 microcode update from Borislav Petkov:
 "A single fix to the late microcode loading machinery which corrects
  the ordering of when new microcode is loaded from the fs, vs checking
  whether all CPUs are online"

* tag 'x86_microcode_for_v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/microcode: Check for offline CPUs before requesting new microcode
This commit is contained in:
Linus Torvalds 2021-04-26 08:58:49 -07:00
parent a4a78bc8ea 7189b3c119
commit 41acc109a5
1 changed files with 4 additions and 4 deletions
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8
arch/x86/kernel/cpu/microcode/core.c
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@ -629,16 +629,16 @@ static ssize_t reload_store(struct device *dev,
if (val != 1)
return size;
tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev, true);
if (tmp_ret != UCODE_NEW)
return size;
get_online_cpus();
ret = check_online_cpus();
if (ret)
goto put;
tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev, true);
if (tmp_ret != UCODE_NEW)
goto put;
mutex_lock(&microcode_mutex);
ret = microcode_reload_late();
mutex_unlock(&microcode_mutex);