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[PATCH] x86 microcode driver vs hotplug CPUs. 

This driver loops over 'num_online_cpus', but it doesn't account for holes
in the online map created by offlined cpus, and assumes that the cpu
numbers stay linear.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Jones 2006-02-28 16:58:53 -08:00 committed by Linus Torvalds
parent ec72070b12
commit 5cf6c541f5
1 changed files with 9 additions and 6 deletions
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15
arch/i386/kernel/microcode.c
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@ -74,6 +74,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@ -250,8 +251,8 @@ static int find_matching_ucodes (void)
error = -EINVAL;
goto out;
}
for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
for_each_online_cpu(cpu_num) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
continue;
@ -293,7 +294,7 @@ static int find_matching_ucodes (void)
error = -EFAULT;
goto out;
}
for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
for_each_online_cpu(cpu_num) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
continue;
@ -304,7 +305,9 @@ static int find_matching_ucodes (void)
}
}
/* now check if any cpu has matched */
for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
allocated_flag = 0;
sum = 0;
for_each_online_cpu(cpu_num) {
if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (!allocated_flag) {
@ -415,12 +418,12 @@ static int do_microcode_update (void)
}
out_free:
for (i = 0; i < num_online_cpus(); i++) {
for_each_online_cpu(i) {
if (ucode_cpu_info[i].mc) {
int j;
void *tmp = ucode_cpu_info[i].mc;
vfree(tmp);
for (j = i; j < num_online_cpus(); j++) {
for_each_online_cpu(j) {
if (ucode_cpu_info[j].mc == tmp)
ucode_cpu_info[j].mc = NULL;
}