[S390] smp_call_function/smp_call_function_on locking.

smp_call_function and smp_call_function_on share the same lock and
smp_call_function_on disables softirq's so it can be called from
softirq context as well. Hence smp_call_function muss disable
softirqs as well to avoid deadlocks.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 65b52320d145661f245f836318d51b7bfb71a317..83a4ea6e3d605fb6637a845924887583a1a08910 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -57,7 +57,7 @@ static void smp_ext_bitcall(int, ec_bit_sig);
 static void smp_ext_bitcall_others(ec_bit_sig);
 
 /*
-5B * Structure and data for smp_call_function(). This is designed to minimise
+ * Structure and data for smp_call_function(). This is designed to minimise
  * static memory requirements. It also looks cleaner.
  */
 static DEFINE_SPINLOCK(call_lock);
@@ -104,7 +104,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
  * remote CPUs are nearly ready to execute <<func>> or are or have executed.
  *
  * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
+ * hardware interrupt handler.
  */
 {
        struct call_data_struct data;
@@ -113,8 +113,8 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
        if (cpus <= 0)
                return 0;
 
-       /* Can deadlock when called with interrupts disabled */
-       WARN_ON(irqs_disabled());
+       /* Can deadlock when interrupts are disabled or if in wrong context */
+       WARN_ON(irqs_disabled() || in_irq());
 
        data.func = func;
        data.info = info;
@@ -123,7 +123,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
        if (wait)
                atomic_set(&data.finished, 0);
 
-       spin_lock(&call_lock);
+       spin_lock_bh(&call_lock);
        call_data = &data;
        /* Send a message to all other CPUs and wait for them to respond */
         smp_ext_bitcall_others(ec_call_function);
@@ -135,7 +135,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
        if (wait)
                while (atomic_read(&data.finished) != cpus)
                        cpu_relax();
-       spin_unlock(&call_lock);
+       spin_unlock_bh(&call_lock);
 
        return 0;
 }
@@ -159,6 +159,9 @@ int smp_call_function_on(void (*func) (void *info), void *info,
        if (!cpu_online(cpu))
                return -EINVAL;
 
+       /* Can deadlock when interrupts are disabled or if in wrong context */
+       WARN_ON(irqs_disabled() || in_irq());
+
        /* disable preemption for local function call */
        curr_cpu = get_cpu();