Commit a1f63446 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Marc Kleine-Budde

can: m_can: process interrupt only when not runtime suspended

Avoid processing bogus interrupt statuses when the HW is runtime suspended and
the M_CAN_IR register read may get all bits 1's. Handler can be called if the
interrupt request is shared with other peripherals or at the end of free_irq().

Therefore check the runtime suspended status before processing.

Fixes: cdf8259d ("can: m_can: Add PM Support")
Signed-off-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20200915134715.696303-1-jarkko.nikula@linux.intel.comSigned-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent cd9f13c5
......@@ -956,6 +956,8 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
struct net_device_stats *stats = &dev->stats;
u32 ir;
if (pm_runtime_suspended(cdev->dev))
return IRQ_NONE;
ir = m_can_read(cdev, M_CAN_IR);
if (!ir)
return IRQ_NONE;
......
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