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HSI: omap_ssi: call msg->complete() from process context 

msg->complete() should always be called from process context once
irq_safe runtime pm flag is no longer set for omap-ssi.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Pavel Machek <pavel@ucw.cz>
hifive-unleashed-5.1
Sebastian Reichel 2016-05-20 06:25:06 +02:00
parent 604fdfa458
commit 4e552310cd
3 changed files with 25 additions and 1 deletions
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4
drivers/hsi/controllers/omap_ssi.h
View File

@ -73,6 +73,8 @@ struct omap_ssm_ctx {
* @txqueue: TX message queues
* @rxqueue: RX message queues
* @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
* @errqueue: Queue for failed messages
* @errqueue_work: Delayed Work for failed messages
* @irq: IRQ number
* @wake_irq: IRQ number for incoming wake line (-1 if none)
* @wake_gpio: GPIO number for incoming wake line (-1 if none)
@ -96,6 +98,8 @@ struct omap_ssi_port {
struct list_head txqueue[SSI_MAX_CHANNELS];
struct list_head rxqueue[SSI_MAX_CHANNELS];
struct list_head brkqueue;
struct list_head errqueue;
struct delayed_work errqueue_work;
unsigned int irq;
int wake_irq;
struct gpio_desc *wake_gpio;

4
drivers/hsi/controllers/omap_ssi_core.c
View File

@ -235,7 +235,9 @@ static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
spin_lock(&omap_port->lock);
list_del(&msg->link); /* Dequeue msg */
spin_unlock(&omap_port->lock);
msg->complete(msg);
list_add_tail(&msg->link, &omap_port->errqueue);
schedule_delayed_work(&omap_port->errqueue_work, 0);
return;
}
spin_lock(&omap_port->lock);

18
drivers/hsi/controllers/omap_ssi_port.c
View File

@ -193,6 +193,21 @@ static int ssi_debug_add_port(struct omap_ssi_port *omap_port,
}
#endif
static void ssi_process_errqueue(struct work_struct *work)
{
struct omap_ssi_port *omap_port;
struct list_head *head, *tmp;
struct hsi_msg *msg;
omap_port = container_of(work, struct omap_ssi_port, errqueue_work.work);
list_for_each_safe(head, tmp, &omap_port->errqueue) {
msg = list_entry(head, struct hsi_msg, link);
msg->complete(msg);
list_del(head);
}
}
static int ssi_claim_lch(struct hsi_msg *msg)
{
@ -1170,6 +1185,7 @@ static int ssi_port_probe(struct platform_device *pd)
omap_port->pdev = &pd->dev;
omap_port->port_id = port_id;
INIT_DEFERRABLE_WORK(&omap_port->errqueue_work, ssi_process_errqueue);
INIT_WORK(&omap_port->work, start_tx_work);
/* initialize HSI port */
@ -1237,6 +1253,8 @@ static int ssi_port_remove(struct platform_device *pd)
ssi_debug_remove_port(port);
#endif
cancel_delayed_work_sync(&omap_port->errqueue_work);
hsi_port_unregister_clients(port);
port->async = hsi_dummy_msg;