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Blackfin: fix deadlock in SMP IPI handler 

When a low priority interrupt (like ethernet) is triggered between 2 high
priority IPI messages, a deadlock in disable_irq() is hit by the second
IPI handler.  This is because the second IPI message is queued within the
first IPI handler, but the handler doesn't process all messages, and new
ones are inserted rather than appended.  So now we process all the pending
messages, and append new ones to the pending list.

URL: http://blackfin.uclinux.org/gf/tracker/5226
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Sonic Zhang 2009-06-10 08:42:41 +00:00 committed by Mike Frysinger
parent f9ee3ab81c
commit 86f2008bf5
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/blackfin/mach-common/smp.c
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@ -144,7 +144,7 @@ static void ipi_call_function(unsigned int cpu, struct ipi_message *msg)
static irqreturn_t ipi_handler(int irq, void *dev_instance)
{
struct ipi_message *msg, *mg;
struct ipi_message *msg;
struct ipi_message_queue *msg_queue;
unsigned int cpu = smp_processor_id();
@ -154,7 +154,8 @@ static irqreturn_t ipi_handler(int irq, void *dev_instance)
msg_queue->count++;
spin_lock(&msg_queue->lock);
list_for_each_entry_safe(msg, mg, &msg_queue->head, list) {
while (!list_empty(&msg_queue->head)) {
msg = list_entry(msg_queue->head.next, typeof(*msg), list);
list_del(&msg->list);
switch (msg->type) {
case BFIN_IPI_RESCHEDULE:
@ -221,7 +222,7 @@ int smp_call_function(void (*func)(void *info), void *info, int wait)
for_each_cpu_mask(cpu, callmap) {
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_irqsave(&msg_queue->lock, flags);
list_add(&msg->list, &msg_queue->head);
list_add_tail(&msg->list, &msg_queue->head);
spin_unlock_irqrestore(&msg_queue->lock, flags);
platform_send_ipi_cpu(cpu);
}
@ -261,7 +262,7 @@ int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_irqsave(&msg_queue->lock, flags);
list_add(&msg->list, &msg_queue->head);
list_add_tail(&msg->list, &msg_queue->head);
spin_unlock_irqrestore(&msg_queue->lock, flags);
platform_send_ipi_cpu(cpu);
@ -292,7 +293,7 @@ void smp_send_reschedule(int cpu)
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_irqsave(&msg_queue->lock, flags);
list_add(&msg->list, &msg_queue->head);
list_add_tail(&msg->list, &msg_queue->head);
spin_unlock_irqrestore(&msg_queue->lock, flags);
platform_send_ipi_cpu(cpu);
@ -320,7 +321,7 @@ void smp_send_stop(void)
for_each_cpu_mask(cpu, callmap) {
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_irqsave(&msg_queue->lock, flags);
list_add(&msg->list, &msg_queue->head);
list_add_tail(&msg->list, &msg_queue->head);
spin_unlock_irqrestore(&msg_queue->lock, flags);
platform_send_ipi_cpu(cpu);
}