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can: sja1000: Prepare the use of a threaded handler 

In order to support a flavor of the sja1000 which sometimes freezes, it
will be needed upon certain interrupts to perform a soft reset. The soft
reset operation takes a bit of time, so better not do it within the hard
interrupt handler but rather in a threaded handler. Let's prepare the
possibility for sja1000_err() to request "interrupting" the current flow
and request the threaded handler to be run while keeping the interrupt
line low.

There is no functional change.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/all/20230616134553.2786391-1-miquel.raynal@bootlin.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Miquel Raynal 2023-06-16 15:45:52 +02:00 committed by Marc Kleine-Budde
parent cf8462a800
commit af7647a0b4
1 changed files with 8 additions and 3 deletions
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11
drivers/net/can/sja1000/sja1000.c
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@ -501,7 +501,8 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
struct sja1000_priv *priv = netdev_priv(dev); struct sja1000_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats; struct net_device_stats *stats = &dev->stats;
uint8_t isrc, status; uint8_t isrc, status;
int n = 0; irqreturn_t ret = 0;
int n = 0, err;
if (priv->pre_irq) if (priv->pre_irq)
priv->pre_irq(priv); priv->pre_irq(priv);
@ -546,19 +547,23 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
} }
if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
/* error interrupt */ /* error interrupt */
if (sja1000_err(dev, isrc, status)) err = sja1000_err(dev, isrc, status);
if (err)
break; break;
} }
n++; n++;
} }
out: out:
if (!ret)
ret = (n) ? IRQ_HANDLED : IRQ_NONE;
if (priv->post_irq) if (priv->post_irq)
priv->post_irq(priv); priv->post_irq(priv);
if (n >= SJA1000_MAX_IRQ) if (n >= SJA1000_MAX_IRQ)
netdev_dbg(dev, "%d messages handled in ISR", n); netdev_dbg(dev, "%d messages handled in ISR", n);
return (n) ? IRQ_HANDLED : IRQ_NONE; return ret;
} }
EXPORT_SYMBOL_GPL(sja1000_interrupt); EXPORT_SYMBOL_GPL(sja1000_interrupt);