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i2c: cadence: add IRQ check 

[ Upstream commit 5581c2c5d02bc63a0edb53e061c8e97cd490646e ]

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: df8eb5691c ("i2c: Add driver for Cadence I2C controller")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sergey Shtylyov 2021-04-10 23:14:35 +03:00 committed by Greg Kroah-Hartman
parent 7e17643124
commit 45f02a0f8d
1 changed files with 4 additions and 1 deletions
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5
drivers/i2c/busses/i2c-cadence.c
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@ -901,7 +901,10 @@ static int cdns_i2c_probe(struct platform_device *pdev)
if (IS_ERR(id->membase))
return PTR_ERR(id->membase);
id->irq = platform_get_irq(pdev, 0);
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
id->irq = ret;
id->adap.owner = THIS_MODULE;
id->adap.dev.of_node = pdev->dev.of_node;