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From:   Felipe Balbi <balbi@kernel.org>
To:     Macpaul Lin <macpaul.lin@mediatek.com>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
Cc:     Ainge Hsu <ainge.hsu@mediatek.com>,
        Eddie Hung <eddie.hung@mediatek.com>,
        Mediatek WSD Upstream <wsd_upstream@mediatek.com>,
        Macpaul Lin <macpaul.lin@mediatek.com>,
        Macpaul Lin <macpaul.lin@gmail.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v3] usb: mtu3: fix panic in mtu3_gadget_stop()
In-Reply-To: <1598520178-17301-1-git-send-email-macpaul.lin@mediatek.com>
References: <1596185878-24360-1-git-send-email-macpaul.lin@mediatek.com>
 <1598520178-17301-1-git-send-email-macpaul.lin@mediatek.com>
Date:   Thu, 27 Aug 2020 16:03:46 +0300
Message-ID: <87pn7ci6kt.fsf@kernel.org>
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Macpaul Lin <macpaul.lin@mediatek.com> writes:

> This patch fixes a possible issue when mtu3_gadget_stop()
> already assigned NULL to mtu->gadget_driver during mtu_gadget_disconnect(=
).
>
> [<ffffff9008161974>] notifier_call_chain+0xa4/0x128
> [<ffffff9008161fd4>] __atomic_notifier_call_chain+0x84/0x138
> [<ffffff9008162ec0>] notify_die+0xb0/0x120
> [<ffffff900809e340>] die+0x1f8/0x5d0
> [<ffffff90080d03b4>] __do_kernel_fault+0x19c/0x280
> [<ffffff90080d04dc>] do_bad_area+0x44/0x140
> [<ffffff90080d0f9c>] do_translation_fault+0x4c/0x90
> [<ffffff9008080a78>] do_mem_abort+0xb8/0x258
> [<ffffff90080849d0>] el1_da+0x24/0x3c
> [<ffffff9009bde01c>] mtu3_gadget_disconnect+0xac/0x128
> [<ffffff9009bd576c>] mtu3_irq+0x34c/0xc18
> [<ffffff90082ac03c>] __handle_irq_event_percpu+0x2ac/0xcd0
> [<ffffff90082acae0>] handle_irq_event_percpu+0x80/0x138
> [<ffffff90082acc44>] handle_irq_event+0xac/0x148
> [<ffffff90082b71cc>] handle_fasteoi_irq+0x234/0x568
> [<ffffff90082a8708>] generic_handle_irq+0x48/0x68
> [<ffffff90082a96ac>] __handle_domain_irq+0x264/0x1740
> [<ffffff90080819f4>] gic_handle_irq+0x14c/0x250
> [<ffffff9008084cec>] el1_irq+0xec/0x194
> [<ffffff90085b985c>] dma_pool_alloc+0x6e4/0xae0
> [<ffffff9008d7f890>] cmdq_mbox_pool_alloc_impl+0xb0/0x238
> [<ffffff9008d80904>] cmdq_pkt_alloc_buf+0x2dc/0x7c0
> [<ffffff9008d80f60>] cmdq_pkt_add_cmd_buffer+0x178/0x270
> [<ffffff9008d82320>] cmdq_pkt_perf_begin+0x108/0x148
> [<ffffff9008d824d8>] cmdq_pkt_create+0x178/0x1f0
> [<ffffff9008f96230>] mtk_crtc_config_default_path+0x328/0x7a0
> [<ffffff90090246cc>] mtk_drm_idlemgr_kick+0xa6c/0x1460
> [<ffffff9008f9bbb4>] mtk_drm_crtc_atomic_begin+0x1a4/0x1a68
> [<ffffff9008e8df9c>] drm_atomic_helper_commit_planes+0x154/0x878
> [<ffffff9008f2fb70>] mtk_atomic_complete.isra.16+0xe80/0x19c8
> [<ffffff9008f30910>] mtk_atomic_commit+0x258/0x898
> [<ffffff9008ef142c>] drm_atomic_commit+0xcc/0x108
> [<ffffff9008ef7cf0>] drm_mode_atomic_ioctl+0x1c20/0x2580
> [<ffffff9008ebc768>] drm_ioctl_kernel+0x118/0x1b0
> [<ffffff9008ebcde8>] drm_ioctl+0x5c0/0x920
> [<ffffff900863b030>] do_vfs_ioctl+0x188/0x1820
> [<ffffff900863c754>] SyS_ioctl+0x8c/0xa0
>
> Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
> Cc: stable@vger.kernel.org

missing a Fixes: line here

=2D-=20
balbi

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