linux-kernel - Re: [PATCH] omap2: hsmmc: fix logic to call either omap_hsmmc_init or omap_hsmmc_late

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Message-Id: <DF7C23F4-38A4-42CE-9D71-D89CC7DC32B4@goldelico.com>
Date:   Mon, 18 Sep 2017 22:33:15 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] omap2: hsmmc: fix logic to call either omap_hsmmc_init or omap_hsmmc_late_init but not both

Hi Tony,
is still there on 4.14-rc1.

BR,
Nikolaus

> Am 08.09.2017 um 21:15 schrieb H. Nikolaus Schaller <hns@...delico.com>:
> 
> With 4.13 kernel I get this boot message:
> 
> [    1.051727] ------------[ cut here ]------------
> [    1.051818] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x54/0x74
> [    1.051849] sysfs: cannot create duplicate filename '/devices/platform/omap_hsmmc.2'
> [    1.051879] Modules linked in:
> [    1.051971] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-letux+ #1360
> [    1.052001] Hardware name: Generic OMAP3 (Flattened Device Tree)
> [    1.052062] [<c010f690>] (unwind_backtrace) from [<c010bba8>] (show_stack+0x10/0x14)
> [    1.052124] [<c010bba8>] (show_stack) from [<c075dc88>] (dump_stack+0x98/0xd0)
> [    1.052185] [<c075dc88>] (dump_stack) from [<c012f398>] (__warn+0xd0/0x100)
> [    1.052215] [<c012f398>] (__warn) from [<c012f3fc>] (warn_slowpath_fmt+0x34/0x44)
> [    1.052276] [<c012f3fc>] (warn_slowpath_fmt) from [<c02ebcb4>] (sysfs_warn_dup+0x54/0x74)
> [    1.052337] [<c02ebcb4>] (sysfs_warn_dup) from [<c02ebd90>] (sysfs_create_dir_ns+0x74/0x84)
> [    1.052398] [<c02ebd90>] (sysfs_create_dir_ns) from [<c0761b8c>] (kobject_add_internal+0xd0/0x294)
> [    1.052429] [<c0761b8c>] (kobject_add_internal) from [<c0761f00>] (kobject_add+0x6c/0x8c)
> [    1.052490] [<c0761f00>] (kobject_add) from [<c04e831c>] (device_add+0xe4/0x510)
> [    1.052551] [<c04e831c>] (device_add) from [<c04ec6e4>] (platform_device_add+0x130/0x1c0)
> [    1.052612] [<c04ec6e4>] (platform_device_add) from [<c01281c0>] (omap_hsmmc_late_init+0x3c/0x60)
> [    1.052673] [<c01281c0>] (omap_hsmmc_late_init) from [<c0b0fa44>] (omap3_pandora_legacy_init+0x24/0xb4)
> [    1.052734] [<c0b0fa44>] (omap3_pandora_legacy_init) from [<c0128178>] (pdata_quirks_check+0x30/0x3c)
> [    1.052795] [<c0128178>] (pdata_quirks_check) from [<c0b0f950>] (omap_generic_init+0xc/0x18)
> [    1.052856] [<c0b0f950>] (omap_generic_init) from [<c0b03480>] (customize_machine+0x1c/0x28)
> [    1.052917] [<c0b03480>] (customize_machine) from [<c0101938>] (do_one_initcall+0xa8/0x150)
> [    1.052947] [<c0101938>] (do_one_initcall) from [<c0b00d70>] (kernel_init_freeable+0x110/0x1d4)
> [    1.053009] [<c0b00d70>] (kernel_init_freeable) from [<c076f198>] (kernel_init+0x8/0x10c)
> [    1.053070] [<c076f198>] (kernel_init) from [<c01070f0>] (ret_from_fork+0x14/0x24)
> [    1.055023] ---[ end trace 44e490b09ac4ab88 ]---
> 
> This can be traced down to the calls of
> 
> 	omap_hsmmc_init(pandora_mmc3);
> 	omap_hsmmc_late_init(pandora_mmc3);
> 
> in omap3_pandora_legacy_init().
> 
> It turns out that both funcions disagree how to decide if the other one was alredy called.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
> arch/arm/mach-omap2/hsmmc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
> index 5b614388d72f..6d28aa20a7d3 100644
> --- a/arch/arm/mach-omap2/hsmmc.c
> +++ b/arch/arm/mach-omap2/hsmmc.c
> @@ -58,10 +58,10 @@ void omap_hsmmc_late_init(struct omap2_hsmmc_info *c)
> 	struct platform_device *pdev;
> 	int res;
> 
> -	if (omap_hsmmc_done != 1)
> +	if (omap_hsmmc_done)
> 		return;
> 
> -	omap_hsmmc_done++;
> +	omap_hsmmc_done = 1;
> 
> 	for (; c->mmc; c++) {
> 		pdev = c->pdev;
> -- 
> 2.12.2
>