From 4605fff00b886657835a58ef3cf2377356029e55 Mon Sep 17 00:00:00 2001 From: Alexey Klimov Date: Tue, 21 Mar 2017 16:57:34 +0000 Subject: [PATCH] mailbox: check ->last_tx_done for NULL in case of timer-based polling It is allowed by code to register mailbox controller that sets txdone_poll flag to request timer-based polling with missed ->last_tx_done() method. If such thing happens and since presence of last_tx_done() is not checked it will fail in hrtimer callback function txdone_hrtimer() when first message will be transmitted. This patch adds check for this method and logging of error on registration of mailbox controller if it requested timer-based polling. Signed-off-by: Alexey Klimov Acked-by: Sudeep Holla Signed-off-by: Jassi Brar --- drivers/mailbox/mailbox.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 4671f8a12872..59b722177bf7 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -453,6 +453,12 @@ int mbox_controller_register(struct mbox_controller *mbox) txdone = TXDONE_BY_ACK; if (txdone == TXDONE_BY_POLL) { + + if (!mbox->ops->last_tx_done) { + dev_err(mbox->dev, "last_tx_done method is absent\n"); + return -EINVAL; + } + hrtimer_init(&mbox->poll_hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); mbox->poll_hrt.function = txdone_hrtimer; -- 2.20.1