From 2081ad1467469b649fc9f9226b235977a7bf9402 Mon Sep 17 00:00:00 2001 From: Conor Dooley Date: Wed, 15 Jun 2022 15:20:29 +0100 Subject: [PATCH] spi: microchip-core: fix passing zero to PTR_ERR warning It is possible that the error case for devm_clk_get() returns NULL, in which case zero will be passed to PTR_ERR() as shown by the Smatch static checker warning: drivers/spi/spi-microchip-core.c:557 mchp_corespi_probe() warn: passing zero to 'PTR_ERR' Remove the NULL check and carry on with a dummy clock in case of an error. To avoid a potential div zero, abort calculating clkgen if clk_get_rate(spi->clk) is zero. Fixes: 9ac8d17694b6 ("spi: add support for microchip fpga spi controllers") Reported-by: Dan Carpenter Link: https://lore.kernel.org/linux-spi/20220615091633.GI2168@kadam/ Signed-off-by: Conor Dooley Link: https://lore.kernel.org/r/20220615142028.2991915-1-conor.dooley@microchip.com Signed-off-by: Mark Brown --- drivers/spi/spi-microchip-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-microchip-core.c b/drivers/spi/spi-microchip-core.c index 856a68fd8e9f..b3083075cd36 100644 --- a/drivers/spi/spi-microchip-core.c +++ b/drivers/spi/spi-microchip-core.c @@ -433,6 +433,8 @@ static int mchp_corespi_calculate_clkgen(struct mchp_corespi *spi, unsigned long clk_hz, spi_hz, clk_gen; clk_hz = clk_get_rate(spi->clk); + if (!clk_hz) + return -EINVAL; spi_hz = min(target_hz, clk_hz); /* @@ -553,7 +555,7 @@ static int mchp_corespi_probe(struct platform_device *pdev) } spi->clk = devm_clk_get(&pdev->dev, NULL); - if (!spi->clk || IS_ERR(spi->clk)) { + if (IS_ERR(spi->clk)) { ret = PTR_ERR(spi->clk); dev_err(&pdev->dev, "could not get clk: %d\n", ret); goto error_release_master;