linux-kernel - Re: [PATCH] mfd: sm501: Set coherent_dma

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Date:   Thu, 16 Aug 2018 10:07:01 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: sm501: Set coherent_dma_mask when creating
 subdevices

On Fri, 03 Aug 2018, Guenter Roeck wrote:

> Instantiating the sm501 OHCI subdevice results in a kernel warning.
> 
> sm501-usb sm501-usb: SM501 OHCI
> sm501-usb sm501-usb: new USB bus registered, assigned bus number 1
> WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516
> ohci_init+0x194/0x2d8
> Modules linked in:
> 
> CPU: 0 PID: 1 Comm: swapper Tainted: G        W
> 4.18.0-rc7-00178-g0b5b1f9a78b5 #1
> PC is at ohci_init+0x194/0x2d8
> PR is at ohci_init+0x168/0x2d8
> PC  : 8c27844c SP  : 8f81dd94 SR  : 40008001
> TEA : 29613060
> R0  : 00000000 R1  : 00000000 R2  : 00000000 R3  : 00000202
> R4  : 8fa98b88 R5  : 8c277e68 R6  : 00000000 R7  : 00000000
> R8  : 8f965814 R9  : 8c388100 R10 : 8fa98800 R11 : 8fa98928
> R12 : 8c48302c R13 : 8fa98920 R14 : 8c48302c
> MACH: 00000096 MACL: 0000017c GBR : 00000000 PR  : 8c278420
> 
> Call trace:
>  [<(ptrval)>] usb_add_hcd+0x1e8/0x6ec
>  [<(ptrval)>] _dev_info+0x0/0x54
>  [<(ptrval)>] arch_local_save_flags+0x0/0x8
>  [<(ptrval)>] arch_local_irq_restore+0x0/0x24
>  [<(ptrval)>] ohci_hcd_sm501_drv_probe+0x114/0x2d8
> ...
> 
> Initialize coherent_dma_mask when creating SM501 subdevices to fix
> the problem.
> 
> Fixes: b6d6454fdb66f ("mfd: SM501 core driver")
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/mfd/sm501.c | 1 +
>  1 file changed, 1 insertion(+)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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