[PATCH v2 2/7] i2c: core: Use generic_handle_irq_safe() in i2c_handle_smbus_host_notify().

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The i2c-i801 driver invokes i2c_handle_smbus_host_notify() from his
interrupt service routine. On PREEMPT_RT i2c-i801's handler is forced
threaded with enabled interrupts which leads to a warning by
handle_irq_event_percpu() assuming that irq_default_primary_handler()
enabled interrupts.

i2c-i801's interrupt handler can't be made non-threaded because the
interrupt line is shared with other devices.

Use generic_handle_irq_safe() which can invoked with disabled and enabled

Reported-by: Michael Below <below@xxxxxxxx>
Link: https://bugs.debian.org/1002537
Cc: Salvatore Bonaccorso <carnil@xxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Reviewed-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
Acked-by: Wolfram Sang <wsa@xxxxxxxxxx>
 drivers/i2c/i2c-core-base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 2c59dd748a49f..3f9e5303b6163 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1424,7 +1424,7 @@ int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr)
 	if (irq <= 0)
 		return -ENXIO;
-	generic_handle_irq(irq);
+	generic_handle_irq_safe(irq);
 	return 0;

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