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| author | Sudeep Holla <sudeep.holla@arm.com> | 2017-09-28 12:18:52 +0200 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2017-11-14 15:51:28 +0100 |
| commit | 33cd7123ac0ba5360656ae27db453de5b9aa711f (patch) | |
| tree | dec497a712c8828367fd6fb2660368d39a56d37c /drivers/mailbox/pcc.c | |
| parent | mailbox: Build Broadcom FlexRM driver as loadable module for iProc SOCs (diff) | |
| download | linux-33cd7123ac0ba5360656ae27db453de5b9aa711f.tar.xz linux-33cd7123ac0ba5360656ae27db453de5b9aa711f.zip | |
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/pcc.c')
| -rw-r--r-- | drivers/mailbox/pcc.c | 4 |
1 files changed, 2 insertions, 2 deletions
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); |