[GIT PULL] x86/microcode for 5.8

From: Borislav Petkov
Date: Mon Jun 01 2020 - 05:31:54 EST


Hi Linus,

just a single fix this time. Please pull,

thx.

---
The following changes since commit 8f3d9f354286745c751374f5f1fcafee6b3f3136:

Linux 5.7-rc1 (2020-04-12 12:35:55 -0700)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_microcode_for_5.8

for you to fetch changes up to 9adbf3c609af92a57a73000a3cb8f4c2d307dfa3:

x86/microcode: Fix return value for microcode late loading (2020-04-22 19:55:50 +0200)

----------------------------------------------------------------
A single fix for late microcode loading to handle the correct return
value from stop_machine(), from Mihai Carabas.

----------------------------------------------------------------
Mihai Carabas (1):
x86/microcode: Fix return value for microcode late loading

arch/x86/kernel/cpu/microcode/core.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 7019d4b2df0c..baec68b7e010 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -545,8 +545,7 @@ static int __wait_for_cpus(atomic_t *t, long long timeout)
/*
* Returns:
* < 0 - on error
- * 0 - no update done
- * 1 - microcode was updated
+ * 0 - success (no update done or microcode was updated)
*/
static int __reload_late(void *info)
{
@@ -573,11 +572,11 @@ static int __reload_late(void *info)
else
goto wait_for_siblings;

- if (err > UCODE_NFOUND) {
- pr_warn("Error reloading microcode on CPU %d\n", cpu);
+ if (err >= UCODE_NFOUND) {
+ if (err == UCODE_ERROR)
+ pr_warn("Error reloading microcode on CPU %d\n", cpu);
+
ret = -1;
- } else if (err == UCODE_UPDATED || err == UCODE_OK) {
- ret = 1;
}

wait_for_siblings:
@@ -608,7 +607,7 @@ static int microcode_reload_late(void)
atomic_set(&late_cpus_out, 0);

ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
- if (ret > 0)
+ if (ret == 0)
microcode_check();

pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode);
@@ -649,7 +648,7 @@ static ssize_t reload_store(struct device *dev,
put:
put_online_cpus();

- if (ret >= 0)
+ if (ret == 0)
ret = size;

return ret;

--
Regards/Gruss,
Boris.

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