| Message ID | 1598520178-17301-1-git-send-email-macpaul.lin@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] usb: mtu3: fix panic in mtu3_gadget_stop() | expand |
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
diff --git a/drivers/usb/mtu3/mtu3_gadget.c b/drivers/usb/mtu3/mtu3_gadget.c index 1de5c9a..1ab3d3a 100644 --- a/drivers/usb/mtu3/mtu3_gadget.c +++ b/drivers/usb/mtu3/mtu3_gadget.c @@ -564,6 +564,7 @@ static int mtu3_gadget_stop(struct usb_gadget *g) spin_unlock_irqrestore(&mtu->lock, flags); + synchronize_irq(mtu->irq); return 0; }
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 --- Changes for v3: - Call synchronize_irq() in mtu3_gadget_stop() instead of remembering callback function in mtu3_gadget_disconnect(). Thanks for Alan's suggestion. Changes for v2: - Check mtu_gadget_driver out of spin_lock might still not work. We use a temporary pointer to remember the callback function. drivers/usb/mtu3/mtu3_gadget.c | 1 + 1 file changed, 1 insertions(+)