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

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Message-ID: <CAPDyKFpLBz0_fRko2vQK8h4XSGtJFyK4a4YtRCym02oPXZWiew@mail.gmail.com>
Date:   Mon, 27 Mar 2023 12:28:37 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     yuzhe@...china.com
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        liqiong <liqiong@...china.com>
Subject: Re: Re: [PATCH] mmc: core: remove unnecessary (void*) conversions

On Mon, 27 Mar 2023 at 04:07, yuzhe <yuzhe@...china.com> wrote:
>
> <p><br /><br /><br />在 2023-03-24, 星期五, 23:47:08 ,Ulf Hansson 写到：</p>
> <pre>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
> </pre>
>
> sorry for making this mistake, I will check seriously next time.

Np, things go wrong sometimes, even in the simple cases. Feel free to
post an updated patch.

Kind regards
Uffe