[PATCH next] perf: arm-ni: Fix an NULL vs IS_ERR() bug
Robin Murphy
robin.murphy at arm.com
Wed Sep 11 05:13:44 PDT 2024
On 2024-09-11 8:39 am, Dan Carpenter wrote:
> The devm_ioremap() function never returns error pointers, it returns a
> NULL pointer if there is an error.
Ah, this code went through a few evolutions, and apparently I missed
that devm_ioremap() and devm_ioremap_resource() helpfully have different
behaviour, urgh. Thanks Dan!
Reviewed-by: Robin Murphy <robin.murphy at arm.com>
> Fixes: 4d5a7680f2b4 ("perf: Add driver for Arm NI-700 interconnect PMU")
> Signed-off-by: Dan Carpenter <dan.carpenter at linaro.org>
> ---
> drivers/perf/arm-ni.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/perf/arm-ni.c b/drivers/perf/arm-ni.c
> index b72df3aea93e..90fcfe693439 100644
> --- a/drivers/perf/arm-ni.c
> +++ b/drivers/perf/arm-ni.c
> @@ -603,8 +603,8 @@ static int arm_ni_probe(struct platform_device *pdev)
> */
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> - if (IS_ERR(base))
> - return PTR_ERR(base);
> + if (!base)
> + return -ENOMEM;
>
> arm_ni_probe_domain(base, &cfg);
> if (cfg.type != NI_GLOBAL)
More information about the linux-arm-kernel
mailing list