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authorSudeep Holla <sudeep.holla@arm.com>2017-09-28 11:18:52 +0100
committerJassi Brar <jaswinder.singh@linaro.org>2017-11-14 20:21:28 +0530
commit33cd7123ac0ba5360656ae27db453de5b9aa711f (patch)
treedec497a712c8828367fd6fb2660368d39a56d37c /drivers/mailbox
parent22d28b0ffcf42e8a98d3fef8d73d1aff26f5518b (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. Cc: Alexey Klimov <alexey.klimov@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/mailbox.c4
-rw-r--r--drivers/mailbox/pcc.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 537f4f6d009b..674b35f402f5 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -351,7 +351,7 @@ 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);
@@ -418,7 +418,7 @@ 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);
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index 9b7005e1345e..27c2294be51a 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -266,7 +266,7 @@ struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
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);
@@ -312,7 +312,7 @@ void pcc_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;
spin_unlock_irqrestore(&chan->lock, flags);

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