[PATCH 4.19 07/99] i2c: Clear client->irq in i2c_device_remove

From: Greg Kroah-Hartman
Date: Mon May 06 2019 - 11:03:54 EST

From: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>

commit 6f108dd70d3010c391c1e9f56f3f20d1f9e75450 upstream.

The IRQ will be mapped in i2c_device_probe only if client->irq is zero and
i2c_device_remove does not clear this. When rebinding an I2C device,
whos IRQ provider has also been rebound this means that an IRQ mapping
will never be created, causing the I2C device to fail to acquire its
IRQ. Fix this issue by clearing client->irq in i2c_device_remove,
forcing i2c_device_probe to lookup the mapping again.

Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/i2c/i2c-core-base.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -430,6 +430,8 @@ static int i2c_device_remove(struct devi
device_init_wakeup(&client->dev, false);

+ client->irq = 0;
return status;