Hello,

maybe it's already on your radar because the commit has a Fixes: line but to make sure you consider this: Commit

21a268069203 ("mtd: rawnand: marvell: prevent harmless warnings")

fixes the following warning for me:

[ 14.135901] ------------[ cut here ]------------ [ 14.140239] WARNING: CPU: 0 PID: 229 at /build/linux-QEquFP/linux-4.18.20/drivers/mtd/nand/raw/nand_base.c:2773 nand_subop_get_data_len+0x60/0xa4 [ 14.152615] Modules linked in: marvell_nand(+) mvneta(+) mvmdio(+) phylink g762 orion_wdt leds_gpio ip_tables x_tables autofs4 btrfs libcrc32c crc32c_generic xor zstd_decompress zstd_compress xxhash zlib_deflate raid6_pq sd_mod gpio_pca953x ahci libahci libata scsi_mod i2c_mv64xxx [ 14.175598] CPU: 0 PID: 229 Comm: systemd-udevd Not tainted 4.18.0-3-armmp #1 Debian 4.18.20-2 [ 14.183529] Hardware name: Marvell Armada 370/XP (Device Tree) [ 14.188923] [<c0316f60>] (unwind_backtrace) from [<c0310330>] (show_stack+0x20/0x24) [ 14.196062] [<c0310330>] (show_stack) from [<c0ac69fc>] (dump_stack+0x94/0xa8) [ 14.202726] [<c0ac69fc>] (dump_stack) from [<c0354138>] (__warn+0xf0/0x108) [ 14.209144] [<c0354138>] (__warn) from [<c0354288>] (warn_slowpath_null+0x50/0x58) [ 14.216119] [<c0354288>] (warn_slowpath_null) from [<c086bbf0>] (nand_subop_get_data_len+0x60/0xa4) [ 14.224492] [<c086bbf0>] (nand_subop_get_data_len) from [<bf39cc84>] (marvell_nfc_parse_instructions+0x6c/0x25c [marvell_nand]) [ 14.235090] [<bf39cc84>] (marvell_nfc_parse_instructions [marvell_nand]) from [<bf39f348>] (marvell_nfc_naked_access_exec+0x38/0x1bc [marvell_nand]) [ 14.247349] [<bf39f348>] (marvell_nfc_naked_access_exec [marvell_nand]) from [<c086c4cc>] (nand_op_parser_exec_op+0x2a8/0x4bc) [ 14.257847] [<c086c4cc>] (nand_op_parser_exec_op) from [<bf39ee70>] (marvell_nfc_exec_op+0x38/0x44 [marvell_nand]) [ 14.267389] [<bf39ee70>] (marvell_nfc_exec_op [marvell_nand]) from [<c086e384>] (nand_reset_op+0x160/0x184) [ 14.276363] [<c086e384>] (nand_reset_op) from [<c086f254>] (nand_reset+0x60/0xc0) [ 14.283258] [<c086f254>] (nand_reset) from [<c087168c>] (nand_scan_ident+0x22c/0x12bc) [ 14.290560] [<c087168c>] (nand_scan_ident) from [<bf39e318>] (marvell_nand_chip_init+0x1b8/0x880 [marvell_nand]) [ 14.299946] [<bf39e318>] (marvell_nand_chip_init [marvell_nand]) from [<bf39ecc0>] (marvell_nfc_probe+0x2e0/0x458 [marvell_nand]) [ 14.310690] [<bf39ecc0>] (marvell_nfc_probe [marvell_nand]) from [<c0822770>] (platform_drv_probe+0x58/0xa8) [ 14.319745] [<c0822770>] (platform_drv_probe) from [<c08202f4>] (driver_probe_device+0x314/0x47c) [ 14.327918] [<c08202f4>] (driver_probe_device) from [<c0820568>] (__driver_attach+0x10c/0x134) [ 14.335862] [<c0820568>] (__driver_attach) from [<c081dc44>] (bus_for_each_dev+0x84/0xc4) [ 14.343398] [<c081dc44>] (bus_for_each_dev) from [<c081fa44>] (driver_attach+0x2c/0x30) [ 14.350772] [<c081fa44>] (driver_attach) from [<c081f2e8>] (bus_add_driver+0x168/0x268) [ 14.358146] [<c081f2e8>] (bus_add_driver) from [<c08212cc>] (driver_register+0x84/0x118) [ 14.365601] [<c08212cc>] (driver_register) from [<c08226c0>] (__platform_driver_register+0x50/0x58) [ 14.373943] [<c08226c0>] (__platform_driver_register) from [<bf3a5024>] (marvell_nfc_driver_init+0x24/0x1000 [marvell_nand]) [ 14.384287] [<bf3a5024>] (marvell_nfc_driver_init [marvell_nand]) from [<c0303660>] (do_one_initcall+0x50/0x210) [ 14.393662] [<c0303660>] (do_one_initcall) from [<c0400cf8>] (do_init_module+0x74/0x224) [ 14.401118] [<c0400cf8>] (do_init_module) from [<c03ffbf0>] (load_module.constprop.17+0x20c0/0x280c) [ 14.409532] [<c03ffbf0>] (load_module.constprop.17) from [<c04005f0>] (sys_finit_module+0xc0/0x110) [ 14.417865] [<c04005f0>] (sys_finit_module) from [<c03011d8>] (__sys_trace_return+0x0/0x10) [ 14.425554] Exception stack(0xdd4c7fa8 to 0xdd4c7ff0) [ 14.430210] 7fa0: b6e4d728 0189f268 00000007 b6e4ce3c 00000000 b6e4d950 [ 14.437744] 7fc0: b6e4d728 0189f268 413f7b00 0000017b 018ac100 00496b00 018abba8 00000000 [ 14.445274] 7fe0: bef6b8a8 bef6b898 b6e46cf9 b6ef5ff2 [ 14.449959] ---[ end trace 5e73e9525a320f70 ]--- [ 14.454238] ------------[ cut here ]------------

and I see several of these during boot.

The commit identifies this warning as harmless but this isn't obvious for users.

The Fixes-Line identifies 760c435e0f85 which is only in 4.19-rc1 but it was backported to 4.18.9 so the problem appears there, too. Older stable releases don't seem to include this commit.

Best regards Uwe