The mailbox startup code is enabling the interrupt even before
any of the associated mailbox queues are allocated. Any pending
received mailbox message could cause a kernel panic as soon as
the interrupt is enabled due to the dereferencing of non-existing
mailbox queues within the ISR.
Signed-off-by: Fernando Guzman Lugo <lugo.ferna...@gmail.com>
Signed-off-by: Suman Anna <s-a...@ti.com>
---
drivers/mailbox/mailbox.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index c38241a..5fea5c2 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -377,14 +377,6 @@ static int mailbox_startup(struct mailbox *mbox)
}
if (!mbox->use_count++) {
- ret = request_irq(mbox->irq, mbox_interrupt,
- IRQF_SHARED | IRQF_NO_SUSPEND,
- mbox->name, mbox);
- if (unlikely(ret)) {
- pr_err("failed to register mailbox interrupt:%d\n",
- ret);
- goto fail_request_irq;
- }
mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
if (!mq) {
ret = -ENOMEM;
@@ -399,17 +391,25 @@ static int mailbox_startup(struct mailbox *mbox)
}
mbox->rxq = mq;
mq->mbox = mbox;
+ ret = request_irq(mbox->irq, mbox_interrupt,
+ IRQF_SHARED | IRQF_NO_SUSPEND,
+ mbox->name, mbox);
+ if (unlikely(ret)) {
+ pr_err("failed to register mailbox interrupt:%d\n",
+ ret);
+ goto fail_request_irq;
+ }
mailbox_enable_irq(mbox, IRQ_RX);
}
mutex_unlock(&mbox_configured_lock);
return 0;
+fail_request_irq:
+ mbox_queue_free(mbox->rxq);
fail_alloc_rxq:
mbox_queue_free(mbox->txq);
fail_alloc_txq:
- free_irq(mbox->irq, mbox);
-fail_request_irq:
if (mbox->ops->shutdown)
mbox->ops->shutdown(mbox);
mbox->use_count--;
--
1.8.1.2
--
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