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soc: fsl: qe: Check of ioremap return value

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[ Upstream commit a222fd8541394b36b13c89d1698d9530afd59a9c ]

As the possible failure of the ioremap(), the par_io could be NULL.
Therefore it should be better to check it and return error in order to
guarantee the success of the initiation.
But, I also notice that all the caller like mpc85xx_qe_par_io_init() in
`arch/powerpc/platforms/85xx/common.c` don't check the return value of
the par_io_init().
Actually, par_io_init() needs to check to handle the potential error.
I will submit another patch to fix that.
Anyway, par_io_init() itsely should be fixed.

Fixes: 7aa1aa6ecec2 ("QE: Move QE from arch/powerpc to drivers/soc")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiasheng Jiang 2021-12-30 09:45:43 +08:00 committed by Greg Kroah-Hartman
parent 54fd522cbb
commit 405878545d
1 changed files with 2 additions and 0 deletions
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2
drivers/soc/fsl/qe/qe_io.c
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@ -41,6 +41,8 @@ int par_io_init(struct device_node *np)
if (ret)
return ret;
par_io = ioremap(res.start, resource_size(&res));
if (!par_io)
return -ENOMEM;
num_ports = of_get_property(np, "num-ports", NULL);
if (num_ports)