[PATCH 4.4 122/190] i2c: jz4780: add IRQ check

From: Greg Kroah-Hartman
Date: Thu May 20 2021 - 07:37:22 EST


From: Sergey Shtylyov <s.shtylyov@xxxxxxxxxxxx>

[ Upstream commit c5e5f7a8d931fb4beba245bdbc94734175fda9de ]

The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to devm_request_irq() (which
takes *unsigned* IRQ #), causing it to fail with -EINVAL, overriding
an original error code. Stop calling devm_request_irq() with invalid
IRQ #s.

Fixes: ba92222ed63a ("i2c: jz4780: Add i2c bus controller driver for Ingenic JZ4780")
Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-jz4780.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index ba3b94505c14..d80cee068bea 100644
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -754,7 +754,10 @@ static int jz4780_i2c_probe(struct platform_device *pdev)

jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0x0);

- i2c->irq = platform_get_irq(pdev, 0);
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ goto err;
+ i2c->irq = ret;
ret = devm_request_irq(&pdev->dev, i2c->irq, jz4780_i2c_irq, 0,
dev_name(&pdev->dev), i2c);
if (ret)
--
2.30.2