linux-kernel - Re: [PATCH] mmc: core: remove unnecessary (void*) conversions

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Date:   Fri, 24 Mar 2023 16:46:19 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Yu Zhe <yuzhe@...china.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        liqiong@...china.com
Subject: Re: [PATCH] mmc: core: remove unnecessary (void*) conversions

On Fri, 24 Mar 2023 at 14:28, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
> On 17.03.2023 07:47, Yu Zhe wrote:
> > Pointer variables of void * type do not require type cast.
> >
> > Signed-off-by: Yu Zhe <yuzhe@...china.com>
> > ---
> >   drivers/mmc/core/debugfs.c  | 2 +-
> >   drivers/mmc/core/host.c     | 2 +-
> >   drivers/mmc/core/mmc_test.c | 6 +++---
> >   3 files changed, 5 insertions(+), 5 deletions(-)
> ...
> > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> > index 096093f7be00..76900f67c782 100644
> > --- a/drivers/mmc/core/host.c
> > +++ b/drivers/mmc/core/host.c
> > @@ -590,7 +590,7 @@ EXPORT_SYMBOL(mmc_alloc_host);
> >
> >   static void devm_mmc_host_release(struct device *dev, void *res)
> >   {
> > -     mmc_free_host(*(struct mmc_host **)res);
> > +     mmc_free_host(res);
>
> The above chunk is wrong and causes following regression on today's
> Linux next-20230324:
>
> Unable to handle kernel paging request at virtual address 0000000000001020
> Mem abort info:
> meson-gx-mmc ffe07000.mmc: allocated mmc-pwrseq
> ...
> [0000000000001020] user address but active_mm is swapper
> Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 3 PID: 10 Comm: kworker/u12:0 Not tainted 6.3.0-rc3-next-20230324+
> #13452
> Hardware name: Khadas VIM3 (DT)
> Workqueue: events_unbound async_run_entry_fn
> pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : mmc_pwrseq_free+0x1c/0x38
> lr : devm_mmc_host_release+0x1c/0x34
> ...
> Call trace:
>   mmc_pwrseq_free+0x1c/0x38
>   devm_mmc_host_release+0x1c/0x34
>   release_nodes+0x5c/0x90
>   devres_release_all+0x8c/0xdc
>   device_unbind_cleanup+0x18/0x68
>   really_probe+0x11c/0x2b4
>   __driver_probe_device+0x78/0xe0
>   driver_probe_device+0xd8/0x160
>   __device_attach_driver+0xb8/0x138
>   bus_for_each_drv+0x84/0xe0
>   __device_attach_async_helper+0xb0/0xd4
>   async_run_entry_fn+0x34/0xe0
>   process_one_work+0x288/0x5c0
>   worker_thread+0x74/0x450
>   kthread+0x124/0x128
>   ret_from_fork+0x10/0x20
> Code: f9000bf3 aa0003f3 f9424c00 b4000080 (f9401000)
> ---[ end trace 0000000000000000 ]---
>
> Ulf: do You want me to send a partial revert or will you handle it by
> dropping this patch?

Thanks for the report, I will simply drop the patch!

Kind regards
Uffe