soc: fsl: qe: Check of ioremap return value

[ 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>

diff --git a/drivers/soc/fsl/qe/qe_io.c b/drivers/soc/fsl/qe/qe_io.c
index 3657e296a8a271d495eadf0480f732cd3db839c8..058c2fec9a4b423d5ea1be275272e0e219a2c61e 100644 (file)
--- a/drivers/soc/fsl/qe/qe_io.c
+++ b/drivers/soc/fsl/qe/qe_io.c
@@ -37,6 +37,8 @@ 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)