[PATCH v5 06/10] clk: starfive: Add StarFive JH7110 Video-Output clock driver

[Xingyu Wu]

On 2023/5/15 5:46, Aurelien Jarno wrote:
> On 2023-04-24 21:54, Xingyu Wu wrote:
>> Add driver for the StarFive JH7110 Video-Output clock controller.
>> And these clock controllers should power on and enable the clocks from
>> SYSCRG first before registering.
>> 
>> Signed-off-by: Xingyu Wu <xingyu.wu at starfivetech.com>
> 
> There seems to be something wrong with this patch. Building the kernel
> with the whole series applied and with CONFIG_FORTIFY_SOURCE=y triggers
> the following kernel bug: 
> 
> [   75.705103] detected buffer overflow in __fortify_strlen
> [   75.710497] ------------[ cut here ]------------
> [   75.715117] kernel BUG at lib/string_helpers.c:1027!
> [   75.720083] Kernel BUG [#1]
> [   75.722879] Modules linked in: clk_starfive_jh7110_vout(+) nvme_fabrics binfmt_misc starfive_wdt jh7110_trng watchdog sfctemp rng_core drm loop fuse drm_panel_orientation_quirks configfs ip_tables x_tables autofs4 ext4 crc32c_generic crc16 mbcache jbd2 dm_mod nvme nvme_core t10_pi crc64_rocksoft crc64 crc_t10dif crct10dif_generic crct10dif_common xhci_pci xhci_hcd mmc_block dwmac_starfive stmmac_platform stmmac usbcore pcs_xpcs of_mdio fixed_phy fwnode_mdio phylink libphy usb_common dw_mmc_starfive dw_mmc_pltfm clk_starfive_jh7110_isp dw_mmc clk_starfive_jh7110_aon ptp phy_starfive_dphy_rx mmc_core pps_core phy_jh7110_pcie i2c_designware_platform clk_starfive_jh7110_stg phy_jh7110_usb i2c_designware_core
> [   75.785411] CPU: 1 PID: 419 Comm: insmod Not tainted 6.3.1+ #1
> [   75.791241] Hardware name: StarFive VisionFive 2 v1.2A (DT)
> [   75.796809] epc : fortify_panic+0x1a/0x1c
> [   75.800828]  ra : fortify_panic+0x1a/0x1c
> [   75.804838] epc : ffffffff80874242 ra : ffffffff80874242 sp : ffffffc80454b6a0
> [   75.812054]  gp : ffffffff8157f008 tp : ffffffd8c1214f80 t0 : 6465746365746564
> [   75.819269]  t1 : 0000000000000064 t2 : 2064657463657465 s0 : ffffffc80454b6b0
> [   75.826483]  s1 : 0000000000000020 a0 : 000000000000002c a1 : ffffffd8fdd63688
> [   75.833697]  a2 : ffffffd8fdd6f8e8 a3 : 0000000000000000 a4 : 0000000000000000
> [   75.840912]  a5 : 0000000000000000 a6 : ffffffff81426a38 a7 : 0000000000000000
> [   75.848126]  s2 : ffffffff80ec4e00 s3 : ffffffd8d9e28008 s4 : 000000000000001f
> [   75.855340]  s5 : 0000000000000000 s6 : ffffffff81580798 s7 : 0000000000ffffff
> [   75.862555]  s8 : ffffffd8d9e29ab0 s9 : 0000000000000011 s10: ffffffff017312a0
> [   75.869770]  s11: ffffffff01731450 t3 : ffffffff81592df7 t4 : ffffffff81592df7
> [   75.876984]  t5 : ffffffff81592df8 t6 : ffffffc80454b4a8
> [   75.882290] status: 0000000200000120 badaddr: 0000000000000000 cause: 0000000000000003
> [   75.890199] [<ffffffff80874242>] fortify_panic+0x1a/0x1c
> [   75.895513] [<ffffffff805c7e20>] auxiliary_match_id+0x70/0xcc
> [   75.901262] [<ffffffff805c7f22>] auxiliary_match+0x1e/0x2a
> [   75.906749] [<ffffffff805bd6b0>] __device_attach_driver+0x2c/0xe4
> [   75.912841] [<ffffffff805bb04e>] bus_for_each_drv+0x70/0xc4
> [   75.918418] [<ffffffff805bdb0a>] __device_attach+0x94/0x198
> [   75.923989] [<ffffffff805bde68>] device_initial_probe+0x1a/0x22
> [   75.929908] [<ffffffff805bc146>] bus_probe_device+0x96/0x98
> [   75.935482] [<ffffffff805b971e>] device_add+0x56a/0x722
> [   75.940710] [<ffffffff805c7fc4>] __auxiliary_device_add+0x40/0x92
> [   75.946803] [<ffffffff80556ff4>] jh7110_reset_controller_register+0x92/0xca
> [   75.953765] [<ffffffff0173034c>] jh7110_voutcrg_probe+0x236/0x2fa [clk_starfive_jh7110_vout]
> [   75.962228] [<ffffffff805bfb40>] platform_probe+0x5e/0xa6
> [   75.967629] [<ffffffff805bd1e6>] really_probe+0xa0/0x342
> [   75.972940] [<ffffffff805bd508>] __driver_probe_device+0x80/0x138
> [   75.979031] [<ffffffff805bd5f8>] driver_probe_device+0x38/0xc4
> [   75.984863] [<ffffffff805bd83a>] __driver_attach+0xd2/0x1a8
> [   75.990436] [<ffffffff805baf92>] bus_for_each_dev+0x6c/0xb8
> [   75.996011] [<ffffffff805bcab6>] driver_attach+0x26/0x2e
> [   76.001325] [<ffffffff805bc384>] bus_add_driver+0x10c/0x1ee
> [   76.006900] [<ffffffff805be5e2>] driver_register+0x52/0xf4
> [   76.012386] [<ffffffff805bf78e>] __platform_driver_register+0x28/0x30
> [   76.018827] [<ffffffff01b72028>] jh7110_voutcrg_driver_init+0x28/0x1000 [clk_starfive_jh7110_vout]
> [   76.027802] [<ffffffff8000281a>] do_one_initcall+0x5c/0x1c8
> [   76.033377] [<ffffffff800a7612>] do_init_module+0x4c/0x1f6
> [   76.038867] [<ffffffff800a9396>] load_module+0x1a6c/0x1ebe
> [   76.044356] [<ffffffff800a99ea>] __do_sys_finit_module+0x9c/0xf8
> [   76.050365] [<ffffffff800a9a82>] sys_finit_module+0x1c/0x24
> [   76.055936] [<ffffffff80003df8>] ret_from_syscall+0x0/0x2
> [   76.061343] Code: 0800 85aa 3517 007a 0513 7ee5 a097 ffff 80e7 fc20 (9002) 7179 
> [   76.068735] ---[ end trace 0000000000000000 ]---
> 

I got the recurrence of this with CONFIG_FORTIFY_SOURCE=y.
And I found the problem that the reset name of auxiliary_device_id in VOUTCRG
is exactly 32 characters. I rename the reset of auxiliary_device_id in VOUTCRG
to a shorter name and fix the problem. And I will fix it in next patch.

Best regards,
Xingyu Wu