powerpc: Fix hard CPU IDs detection

commit 9d07bc841c9779b4d7902e417f4e509996ce805d
"powerpc: Properly handshake CPUs going out of boot spin loop"

Would cause a miscalculation of the hard CPU ID. It removes breaking
out of the loop when finding a match with a processor, thus the "i"
used as an index in the intserv array is always incorrect

This broke interrupt on my PowerMac laptop.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 5311a26dcf4610b61ee97d5fff4371e38af169a1..48aeb55faae9b806363317493800521ad8e2ec57 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -278,6 +278,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
        int i, nthreads;
        unsigned long len;
        int found = -1;
+       int found_thread = 0;
 
        /* We are scanning "cpu" nodes only */
        if (type == NULL || strcmp(type, "cpu") != 0)
@@ -301,9 +302,11 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
                 * version 2 of the kexec param format adds the phys cpuid of
                 * booted proc.
                 */
-               if (initial_boot_params && initial_boot_params->version >= 2) {
-                       if (intserv[i] == initial_boot_params->boot_cpuid_phys)
+               if (initial_boot_params->version >= 2) {
+                       if (intserv[i] == initial_boot_params->boot_cpuid_phys) {
                                found = boot_cpu_count;
+                               found_thread = i;
+                       }
                } else {
                        /*
                         * Check if it's the boot-cpu, set it's hw index now,
@@ -322,9 +325,9 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 
        if (found >= 0) {
                DBG("boot cpu: logical %d physical %d\n", found,
-                       intserv[i]);
+                       intserv[found_thread]);
                boot_cpuid = found;
-               set_hard_smp_processor_id(found, intserv[i]);
+               set_hard_smp_processor_id(found, intserv[found_thread]);
 
                /*
                 * PAPR defines "logical" PVR values for cpus that