Hi Thierry, Daniel, and David,
On Fri, Jan 27, 2023 at 11:14:00PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The error handling for platform_get_irq() failing no longer
> works after a recent change, clang now points this out with
> a warning:
>
> drivers/gpu/host1x/dev.c:520:6: error: variable 'syncpt_irq' is uninitialized when used here [-Werror,-Wuninitialized]
> if (syncpt_irq < 0)
> ^~~~~~~~~~
>
> Fix this by removing the variable and checking the correct
> error status.
>
> Fixes: 625d4ffb438c ("gpu: host1x: Rewrite syncpoint interrupt handling")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/gpu/host1x/dev.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
> index 4872d183d860..aae2efeef503 100644
> --- a/drivers/gpu/host1x/dev.c
> +++ b/drivers/gpu/host1x/dev.c
> @@ -487,7 +487,6 @@ static int host1x_get_resets(struct host1x *host)
> static int host1x_probe(struct platform_device *pdev)
> {
> struct host1x *host;
> - int syncpt_irq;
> int err;
>
> host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
> @@ -517,8 +516,8 @@ static int host1x_probe(struct platform_device *pdev)
> }
>
> host->syncpt_irq = platform_get_irq(pdev, 0);
> - if (syncpt_irq < 0)
> - return syncpt_irq;
> + if (host->syncpt_irq < 0)
> + return host->syncpt_irq;
>
> mutex_init(&host->devices_lock);
> INIT_LIST_HEAD(&host->devices);
> --
> 2.39.0
>
Apologies if this has been reported already or has a solution in
progress but mainline is now broken because this change got separated
from the change it is fixing:
https://github.com/ClangBuiltLinux/continuous-integration2/actions/runs/4249931209/jobs/7391912774
https://storage.tuxsuite.com/public/clangbuiltlinux/continuous-integration2/builds/2M7y9HpiXB13qiC2mkHMyeZOcLW/build.log
I see this change sitting in the drm-tegra tree [1], which is getting
merged into -next, so it is fixed there, which is why we did not notice
any issues until the drm-next tree was merged into mainline. Can this be
fast tracked to Linus to unbreak clang builds with -Werror?
[1]: https://gitlab.freedesktop.org/drm/tegra/-/commit/b9930311641cf2ed905a84aabe27e8f3868aee4a
Cheers,
Nathan
