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mailbox: check ->last_tx_done for NULL in case of timer-based polling

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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 <alexey.klimov@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Alexey Klimov 2017-03-21 16:57:34 +00:00 committed by Jassi Brar
parent dd32fae072
commit 4605fff00b
1 changed files with 6 additions and 0 deletions
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6
drivers/mailbox/mailbox.c
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@ -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;