diff options
| author | Sudeep Holla <sudeep.holla@arm.com> | 2017-06-19 15:13:00 +0100 |
|---|---|---|
| committer | Ryan Harkin <ryan.harkin@linaro.org> | 2017-07-27 09:53:34 +0100 |
| commit | 173f6312fe5fa3503ef2a94400003bf91e120990 (patch) | |
| tree | 35d184b7523379b5df1b97048f86d378d5cf6275 | |
| parent | 1069bd5f6666964abaef44f15556bb55e51bf1f0 (diff) | |
mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone
Currently the mailbox framework sets txdone_method to TXDONE_BY_POLL if
the controller sets txdone_by_poll. However some clients can have a
mechanism to do TXDONE_BY_ACK which they can specify by knows_txdone.
However, we endup setting both TXDONE_BY_POLL and TXDONE_BY_ACK in that
case. In such scenario, we may end up with below warnings as the tx
ticker is run both by mailbox framework and the client.
WARNING: CPU: 1 PID: 0 at kernel/time/hrtimer.c:805 hrtimer_forward+0x88/0xd8
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc5 #242
Hardware name: ARM LTD ARM Juno Development Platform
task: ffff8009768ca700 task.stack: ffff8009768f8000
PC is at hrtimer_forward+0x88/0xd8
LR is at txdone_hrtimer+0xd4/0xf8
Call trace:
hrtimer_forward+0x88/0xd8
__hrtimer_run_queues+0xe4/0x158
hrtimer_interrupt+0xa4/0x220
arch_timer_handler_phys+0x30/0x40
handle_percpu_devid_irq+0x78/0x130
generic_handle_irq+0x24/0x38
__handle_domain_irq+0x5c/0xb8
gic_handle_irq+0x54/0xa8
This patch fixes the issue by resetting TXDONE_BY_POLL if client has set
knows_txdone.
Change-Id: I2fd425c35a479f6cef8345ad6245748122f65583
Cc: Alexey Klimov <alexey.klimov@arm.com>
Cc: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
| -rw-r--r-- | drivers/mailbox/mailbox.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 3efb12b24d37..82641574f4ce 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -349,7 +349,7 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) init_completion(&chan->tx_complete); if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) - chan->txdone_method |= TXDONE_BY_ACK; + chan->txdone_method = TXDONE_BY_ACK; spin_unlock_irqrestore(&chan->lock, flags); @@ -416,7 +416,7 @@ void mbox_free_channel(struct mbox_chan *chan) spin_lock_irqsave(&chan->lock, flags); chan->cl = NULL; chan->active_req = NULL; - if (chan->txdone_method == (TXDONE_BY_POLL | TXDONE_BY_ACK)) + if (chan->txdone_method == TXDONE_BY_ACK) chan->txdone_method = TXDONE_BY_POLL; module_put(chan->mbox->dev->driver->owner); |