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can: mpc5xxx_can: check of_iomap return before use 

of_iomap() can return NULL so that return needs to be checked and NULL
treated as failure. While at it also take care of the missing
of_node_put() in the error path.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: commit afa17a500a ("net/can: add driver for mscan family & mpc52xx_mscan")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Nicholas Mc Guire 2018-07-09 21:16:40 +02:00 committed by Marc Kleine-Budde
parent 393753b217
commit b5c1a23b17
1 changed files with 5 additions and 0 deletions
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5
drivers/net/can/mscan/mpc5xxx_can.c
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@ -86,6 +86,11 @@ static u32 mpc52xx_can_get_clock(struct platform_device *ofdev,
return 0;
}
cdm = of_iomap(np_cdm, 0);
if (!cdm) {
of_node_put(np_cdm);
dev_err(&ofdev->dev, "can't map clock node!\n");
return 0;
}
if (in_8(&cdm->ipb_clk_sel) & 0x1)
freq *= 2;