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5737cfe87a
Phy for slot 0 and 1 is shared and handled properly in slot 0. If there is only one port in use,(slot 0) we shall not call the 'phy_power_off' function with an invalid slot because kernel will crash with an unaligned access fault like the following: mt7621-pci 1e140000.pcie: Error applying setting, reverse things back mt7621-pci-phy 1e149000.pcie-phy: PHY for 0xbe149000 (dual port = 1) mt7621-pci-phy 1e14a000.pcie-phy: PHY for 0xbe14a000 (dual port = 0) mt7621-pci-phy 1e149000.pcie-phy: Xtal is 40MHz mt7621-pci-phy 1e14a000.pcie-phy: Xtal is 40MHz mt7621-pci 1e140000.pcie: pcie1 no card, disable it (RST & CLK) Unhandled kernel unaligned access[#1]: CPU: 3 PID: 111 Comm: kworker/3:2 Not tainted 5.6.0-rc3-00347-g825c6f470c62-dirty #9 Workqueue: events deferred_probe_work_func $ 0 : 00000000 00000001 5f60d043 8fe1ba80 $ 4 : 0000010d 01eb9000 00000000 00000000 $ 8 : 294b4c00 80940000 00000008 000000ce $12 : 2e303030 00000000 00000000 65696370 $16 : ffffffed 0000010d 8e373cd0 8214c1e0 $20 : 00000000 82144c80 82144680 8214c250 $24 : 00000018 803ef8f4 $28 : 8e372000 8e373c60 8214c080 803940e8 Hi : 00000125 Lo : 122f2000 epc : 807b3328 mutex_lock+0x8/0x44 ra : 803940e8 phy_power_off+0x28/0xb0 Status: 1100fc03 KERNEL EXL IE Cause : 00800010 (ExcCode 04) BadVA : 0000010d PrId : 0001992f (MIPS 1004Kc) Modules linked in: Process kworker/3:2 (pid: 111, threadinfo=(ptrval), task=(ptrval), tls=00000000) Stack : 8e373cd0 803fe4f4 8e372000 8e373c90 8214c080 804fde1c 8e373c98 808d62f4 8e373c78 00000000 8214c254 804fe648 1e160000 804f27b8 00000001 808d62f4 00000000 00000001 8214c228 808d62f4 80930000 809a0000 8fd47e10 808d63d4 808d62d4 8fd47e10 808d0000 808d0000 8e373cd0 8e373cd0 809e2a74 809db510 809db510 00000006 00000001 00000000 00000000 00000000 01000000 1e1440ff ... Call Trace: [<807b3328>] mutex_lock+0x8/0x44 [<803940e8>] phy_power_off+0x28/0xb0 [<804fe648>] mt7621_pci_probe+0xc20/0xd18 [<80402ab8>] platform_drv_probe+0x40/0x94 [<80400a74>] really_probe+0x104/0x364 [<803feb74>] bus_for_each_drv+0x84/0xdc [<80400924>] __device_attach+0xdc/0x120 [<803ffb5c>] bus_probe_device+0xa0/0xbc [<80400124>] deferred_probe_work_func+0x7c/0xbc [<800420e8>] process_one_work+0x230/0x450 [<80042638>] worker_thread+0x330/0x5fc [<80048eb0>] kthread+0x12c/0x134 [<80007438>] ret_from_kernel_thread+0x14/0x1c Code: |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.