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Message-ID: <20220615142028.2991915-1-conor.dooley@microchip.com>
Date: Wed, 15 Jun 2022 15:20:29 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Mark Brown <broonie@...nel.org>
CC: Daire McNamara <daire.mcnamara@...rochip.com>,
Lewis Hanly <lewis.hanly@...rochip.com>,
Conor Dooley <conor.dooley@...rochip.com>,
<linux-riscv@...ts.infradead.org>, <linux-spi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH v2] 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 <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/linux-spi/20220615091633.GI2168@kadam/
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
v2: drop the NULL check entirely rather than returning -ENXIO if NULL
---
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 5b2aee30fa04..d866a831104c 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;
--
2.36.1
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