spi-nor 5.11 regression: Division by zero in kernel

DISCUSSION Rafał Miłecki 3 participants 4 messages Aug 2, 2021 – Aug 3, 2021

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Memory technology devices (MTD) SPI

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Rafał Miłecki

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2021-08-02 13:24 UTC #0 lore raw

Hi,

It seems that kernel 5.11 broke spi-nor on Broadcom Northstar (BCM5301X) platforms.

The problem seems to be spi_nor_spimem_read_data() which calculates:
op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;

On Northstar this happens to be:
op.dummy.nbytes = (0 * 0) / 8;

That results in bcm_qspi_bspi_set_flex_mode() dividing by zero in the:
bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;

Could you take a look at that issue, please?

GOOD 5.10.55
BAD 5.11.22
BAD 5.12.19
BAD 5.13.2
BAD 5.13.7

[    1.075513] Division by zero in kernel.
[    1.079354] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.7 #18
[    1.085376] Hardware name: BCM5301X
[    1.088873] [<c0108394>] (unwind_backtrace) from [<c010498c>] (show_stack+0x10/0x14)
[    1.096666] [<c010498c>] (show_stack) from [<c0696470>] (dump_stack+0x94/0xa8)
[    1.103926] [<c0696470>] (dump_stack) from [<c03e7f94>] (Ldiv0+0x8/0x10)
[    1.110653] [<c03e7f94>] (Ldiv0) from [<c0699274>] (bcm_qspi_exec_mem_op+0x3e0/0x744)
[    1.118512] [<c0699274>] (bcm_qspi_exec_mem_op) from [<c0698740>] (spi_mem_exec_op+0x184/0x4fc)
[    1.127234] [<c0698740>] (spi_mem_exec_op) from [<c0698bac>] (spi_mem_dirmap_read+0xf4/0x1c8)
[    1.135780] [<c0698bac>] (spi_mem_dirmap_read) from [<c0697d58>] (spi_nor_spimem_read_data+0x13c/0x1ec)
[    1.145199] [<c0697d58>] (spi_nor_spimem_read_data) from [<c0498d60>] (spi_nor_read+0x16c/0x174)
[    1.154008] [<c0498d60>] (spi_nor_read) from [<c04835d0>] (mtd_read_oob_std+0x9c/0xa4)
[    1.161964] [<c04835d0>] (mtd_read_oob_std) from [<c04855d0>] (mtd_read_oob+0x84/0x148)
[    1.169997] [<c04855d0>] (mtd_read_oob) from [<c04856f4>] (mtd_read+0x60/0x90)
[    1.177237] [<c04856f4>] (mtd_read) from [<c048ab50>] (bcm47xxpart_parse+0x1d4/0x744)
[    1.185089] [<c048ab50>] (bcm47xxpart_parse) from [<c0488568>] (parse_mtd_partitions+0x188/0x424)
[    1.193985] [<c0488568>] (parse_mtd_partitions) from [<c0486018>] (mtd_device_parse_register+0x7c/0x1c0)
[    1.203489] [<c0486018>] (mtd_device_parse_register) from [<c04998b8>] (spi_nor_probe+0x20c/0x2d0)
[    1.212471] [<c04998b8>] (spi_nor_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.220245] [<c046fbf8>] (really_probe) from [<c046dd40>] (bus_for_each_drv+0x80/0xd0)
[    1.228184] [<c046dd40>] (bus_for_each_drv) from [<c04701d0>] (__device_attach+0xf8/0x15c)
[    1.236468] [<c04701d0>] (__device_attach) from [<c046edd4>] (bus_probe_device+0x84/0x8c)
[    1.244668] [<c046edd4>] (bus_probe_device) from [<c046c6c4>] (device_add+0x300/0x840)
[    1.252606] [<c046c6c4>] (device_add) from [<c04b3dc4>] (spi_add_device+0x9c/0x164)
[    1.260292] [<c04b3dc4>] (spi_add_device) from [<c04b482c>] (spi_register_controller+0x8ac/0xbc0)
[    1.269187] [<c04b482c>] (spi_register_controller) from [<c04b7bd4>] (bcm_qspi_probe+0x600/0x700)
[    1.278092] [<c04b7bd4>] (bcm_qspi_probe) from [<c0471d3c>] (platform_probe+0x48/0x8c)
[    1.286030] [<c0471d3c>] (platform_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.293880] [<c046fbf8>] (really_probe) from [<c04705dc>] (device_driver_attach+0xf0/0x100)
[    1.302254] [<c04705dc>] (device_driver_attach) from [<c0470678>] (__driver_attach+0x8c/0x11c)
[    1.310888] [<c0470678>] (__driver_attach) from [<c046dc74>] (bus_for_each_dev+0x74/0xc0)
[    1.319086] [<c046dc74>] (bus_for_each_dev) from [<c046efc8>] (bus_add_driver+0xf4/0x1dc)
[    1.327286] [<c046efc8>] (bus_add_driver) from [<c0470cdc>] (driver_register+0x88/0x118)
[    1.335397] [<c0470cdc>] (driver_register) from [<c01016dc>] (do_one_initcall+0x54/0x1d0)
[    1.343598] [<c01016dc>] (do_one_initcall) from [<c08010e8>] (kernel_init_freeable+0x244/0x2ac)
[    1.352337] [<c08010e8>] (kernel_init_freeable) from [<c069a7c8>] (kernel_init+0x8/0x118)
[    1.360536] [<c069a7c8>] (kernel_init) from [<c0100130>] (ret_from_fork+0x14/0x24)
[    1.368125] Exception stack(0xc1035fb0 to 0xc1035ff8)
[    1.373184] 5fa0:                                     00000000 00000000 00000000 00000000
[    1.381384] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    1.389582] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000

[email protected]

2021-08-02 14:39 UTC #1 lore raw

Quoted 3 lines · Rafał Miłecki

EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
Hi,

Hi, Rafał!

Quoted 13 lines

It seems that kernel 5.11 broke spi-nor on Broadcom Northstar (BCM5301X) platforms.
The problem seems to be spi_nor_spimem_read_data() which calculates:
op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
On Northstar this happens to be:
op.dummy.nbytes = (0 * 0) / 8;
That results in bcm_qspi_bspi_set_flex_mode() dividing by zero in the:
bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;

Quoted 8 lines

Could you take a look at that issue, please?
GOOD    5.10.55
BAD     5.11.22
BAD     5.12.19
BAD     5.13.2
BAD     5.13.7

It's hard to guess. Would you please bisect and identify the commit that introduces the regression?

Thanks,
ta

Quoted 45 lines

[    1.075513] Division by zero in kernel.
[    1.079354] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.7 #18
[    1.085376] Hardware name: BCM5301X
[    1.088873] [<c0108394>] (unwind_backtrace) from [<c010498c>] (show_stack+0x10/0x14)
[    1.096666] [<c010498c>] (show_stack) from [<c0696470>] (dump_stack+0x94/0xa8)
[    1.103926] [<c0696470>] (dump_stack) from [<c03e7f94>] (Ldiv0+0x8/0x10)
[    1.110653] [<c03e7f94>] (Ldiv0) from [<c0699274>] (bcm_qspi_exec_mem_op+0x3e0/0x744)
[    1.118512] [<c0699274>] (bcm_qspi_exec_mem_op) from [<c0698740>] (spi_mem_exec_op+0x184/0x4fc) [    1.127234] [<c0698740>] (spi_mem_exec_op) from [<c0698bac>] (spi_mem_dirmap_read+0xf4/0x1c8) [    1.135780] [<c0698bac>] (spi_mem_dirmap_read) from [<c0697d58>] (spi_nor_spimem_read_data+0x13c/0x1ec) [    1.145199] [<c0697d58>] (spi_nor_spimem_read_data) from [<c0498d60>] (spi_nor_read+0x16c/0x174) [    1.154008] [<c0498d60>] (spi_nor_read) from [<c04835d0>] (mtd_read_oob_std+0x9c/0xa4) [    1.161964] [<c04835d0>] (mtd_read_oob_std) from [<c04855d0>] (mtd_read_oob+0x84/0x148) [    1.169997] [<c04855d0>] (mtd_read_oob) from [<c04856f4>] (mtd_read+0x60/0x90)
[    1.177237] [<c04856f4>] (mtd_read) from [<c048ab50>] (bcm47xxpart_parse+0x1d4/0x744)
[    1.185089] [<c048ab50>] (bcm47xxpart_parse) from [<c0488568>] (parse_mtd_partitions+0x188/0x424) [    1.193985] [<c0488568>] (parse_mtd_partitions) from [<c0486018>] (mtd_device_parse_register+0x7c/0x1c0) [    1.203489] [<c0486018>] (mtd_device_parse_register) from [<c04998b8>] (spi_nor_probe+0x20c/0x2d0) [    1.212471] [<c04998b8>] (spi_nor_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.220245] [<c046fbf8>] (really_probe) from [<c046dd40>] (bus_for_each_drv+0x80/0xd0) [    1.228184] [<c046dd40>] (bus_for_each_drv) from [<c04701d0>] (__device_attach+0xf8/0x15c) [    1.236468] [<c04701d0>] (__device_attach) from [<c046edd4>] (bus_probe_device+0x84/0x8c) [    1.244668] [<c046edd4>] (bus_probe_device) from [<c046c6c4>] (device_add+0x300/0x840) [    1.252606] [<c046c6c4>] (device_add) from [<c04b3dc4>] (spi_add_device+0x9c/0x164)
[    1.260292] [<c04b3dc4>] (spi_add_device) from [<c04b482c>] (spi_register_controller+0x8ac/0xbc0) [    1.269187] [<c04b482c>] (spi_register_controller) from [<c04b7bd4>] (bcm_qspi_probe+0x600/0x700) [    1.278092] [<c04b7bd4>] (bcm_qspi_probe) from [<c0471d3c>] (platform_probe+0x48/0x8c) [    1.286030] [<c0471d3c>] (platform_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.293880] [<c046fbf8>] (really_probe) from [<c04705dc>] (device_driver_attach+0xf0/0x100) [    1.302254] [<c04705dc>] (device_driver_attach) from [<c0470678>] (__driver_attach+0x8c/0x11c) [    1.310888] [<c0470678>] (__driver_attach) from [<c046dc74>] (bus_for_each_dev+0x74/0xc0) [    1.319086] [<c046dc74>] (bus_for_each_dev) from [<c046efc8>] (bus_add_driver+0xf4/0x1dc) [    1.327286] [<c046efc8>] (bus_add_driver) from [<c0470cdc>] (driver_register+0x88/0x118) [    1.335397] [<c0470cdc>] (driver_register) from [<c01016dc>] (do_one_initcall+0x54/0x1d0) [    1.343598] [<c01016dc>] (do_one_initcall) from [<c08010e8>] (kernel_init_freeable+0x244/0x2ac) [    1.352337] [<c08010e8>] (kernel_init_freeable) from [<c069a7c8>] (kernel_init+0x8/0x118) [    1.360536] [<c069a7c8>] (kernel_init) from [<c0100130>] (ret_from_fork+0x14/0x24)
[    1.368125] Exception stack(0xc1035fb0 to 0xc1035ff8)
[    1.373184] 5fa0:                                     00000000 00000000 00000000 00000000 [    1.381384] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [    1.389582] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Pratyush Yadav

2021-08-02 18:12 UTC #2 lore raw

+ Mark

Quoted 29 lines · On 02/08/21 02:39PM, [email protected] wrote:

Quoted 3 lines · Rafał Miłecki
EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
Hi,
Hi, Rafał!
Quoted 13 lines
It seems that kernel 5.11 broke spi-nor on Broadcom Northstar (BCM5301X) platforms.
The problem seems to be spi_nor_spimem_read_data() which calculates:
op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
On Northstar this happens to be:
op.dummy.nbytes = (0 * 0) / 8;
That results in bcm_qspi_bspi_set_flex_mode() dividing by zero in the:
bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;
Quoted 8 lines
Could you take a look at that issue, please?
GOOD    5.10.55
BAD     5.11.22
BAD     5.12.19
BAD     5.13.2
BAD     5.13.7

Quoted 2 lines

It's hard to guess. Would you please bisect and identify the commit that introduces the regression?

I think the bug is pretty obvious here. op->dummy.buswidth is 0 when there is no dummy phase, and that's why there is a division by zero. The controller driver does not check if the dummy phase exists (by checking op->dummy.nbytes) before performing the calculation. I saw a similar patch posted for spi-cadence-quadspi.c [0]. The fix is obvious IMO.

BTW, I think this was introduced by 0e30f47232ab ("mtd: spi-nor: add support for DTR protocol"). It set buswidths of non-existent phases to 0.

The main question is: do we want to keep the buswidth 0 when the dummy phase does not exist? It seems to be tripping up controller drivers. FWIW, I think we should keep it 0 since I think that when dummy.nbytes == 0 the other fields should be "don't care". The responsibility should lie on the controller driver to check this.

Thoughts?

[0] https://patchwork.kernel.org/project/spi-devel-general/patch/[email protected]/

Quoted 53 lines

Thanks,
ta
Quoted 42 lines
[    1.075513] Division by zero in kernel.
[    1.079354] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.7 #18
[    1.085376] Hardware name: BCM5301X
[    1.088873] [<c0108394>] (unwind_backtrace) from [<c010498c>] (show_stack+0x10/0x14)
[    1.096666] [<c010498c>] (show_stack) from [<c0696470>] (dump_stack+0x94/0xa8)
[    1.103926] [<c0696470>] (dump_stack) from [<c03e7f94>] (Ldiv0+0x8/0x10)
[    1.110653] [<c03e7f94>] (Ldiv0) from [<c0699274>] (bcm_qspi_exec_mem_op+0x3e0/0x744)
[    1.118512] [<c0699274>] (bcm_qspi_exec_mem_op) from [<c0698740>] (spi_mem_exec_op+0x184/0x4fc) [    1.127234] [<c0698740>] (spi_mem_exec_op) from [<c0698bac>] (spi_mem_dirmap_read+0xf4/0x1c8) [    1.135780] [<c0698bac>] (spi_mem_dirmap_read) from [<c0697d58>] (spi_nor_spimem_read_data+0x13c/0x1ec) [    1.145199] [<c0697d58>] (spi_nor_spimem_read_data) from [<c0498d60>] (spi_nor_read+0x16c/0x174) [    1.154008] [<c0498d60>] (spi_nor_read) from [<c04835d0>] (mtd_read_oob_std+0x9c/0xa4) [    1.161964] [<c04835d0>] (mtd_read_oob_std) from [<c04855d0>] (mtd_read_oob+0x84/0x148) [    1.169997] [<c04855d0>] (mtd_read_oob) from [<c04856f4>] (mtd_read+0x60/0x90)
[    1.177237] [<c04856f4>] (mtd_read) from [<c048ab50>] (bcm47xxpart_parse+0x1d4/0x744)
[    1.185089] [<c048ab50>] (bcm47xxpart_parse) from [<c0488568>] (parse_mtd_partitions+0x188/0x424) [    1.193985] [<c0488568>] (parse_mtd_partitions) from [<c0486018>] (mtd_device_parse_register+0x7c/0x1c0) [    1.203489] [<c0486018>] (mtd_device_parse_register) from [<c04998b8>] (spi_nor_probe+0x20c/0x2d0) [    1.212471] [<c04998b8>] (spi_nor_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.220245] [<c046fbf8>] (really_probe) from [<c046dd40>] (bus_for_each_drv+0x80/0xd0) [    1.228184] [<c046dd40>] (bus_for_each_drv) from [<c04701d0>] (__device_attach+0xf8/0x15c) [    1.236468] [<c04701d0>] (__device_attach) from [<c046edd4>] (bus_probe_device+0x84/0x8c) [    1.244668] [<c046edd4>] (bus_probe_device) from [<c046c6c4>] (device_add+0x300/0x840) [    1.252606] [<c046c6c4>] (device_add) from [<c04b3dc4>] (spi_add_device+0x9c/0x164)
[    1.260292] [<c04b3dc4>] (spi_add_device) from [<c04b482c>] (spi_register_controller+0x8ac/0xbc0) [    1.269187] [<c04b482c>] (spi_register_controller) from [<c04b7bd4>] (bcm_qspi_probe+0x600/0x700) [    1.278092] [<c04b7bd4>] (bcm_qspi_probe) from [<c0471d3c>] (platform_probe+0x48/0x8c) [    1.286030] [<c0471d3c>] (platform_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.293880] [<c046fbf8>] (really_probe) from [<c04705dc>] (device_driver_attach+0xf0/0x100) [    1.302254] [<c04705dc>] (device_driver_attach) from [<c0470678>] (__driver_attach+0x8c/0x11c) [    1.310888] [<c0470678>] (__driver_attach) from [<c046dc74>] (bus_for_each_dev+0x74/0xc0) [    1.319086] [<c046dc74>] (bus_for_each_dev) from [<c046efc8>] (bus_add_driver+0xf4/0x1dc) [    1.327286] [<c046efc8>] (bus_add_driver) from [<c0470cdc>] (driver_register+0x88/0x118) [    1.335397] [<c0470cdc>] (driver_register) from [<c01016dc>] (do_one_initcall+0x54/0x1d0) [    1.343598] [<c01016dc>] (do_one_initcall) from [<c08010e8>] (kernel_init_freeable+0x244/0x2ac) [    1.352337] [<c08010e8>] (kernel_init_freeable) from [<c069a7c8>] (kernel_init+0x8/0x118) [    1.360536] [<c069a7c8>] (kernel_init) from [<c0100130>] (ret_from_fork+0x14/0x24)
[    1.368125] Exception stack(0xc1035fb0 to 0xc1035ff8)
[    1.373184] 5fa0:                                     00000000 00000000 00000000 00000000 [    1.381384] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [    1.389582] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Quoted 3 lines
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Signature · 3 lines

Regards,
Pratyush Yadav
Texas Instruments Inc.

[email protected]

2021-08-03 04:13 UTC #3 lore raw

Quoted 43 lines · Pratyush Yadav

EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
+ Mark
Quoted 29 lines · On 02/08/21 02:39PM, [email protected] wrote:
Quoted 3 lines · Rafał Miłecki
EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
Hi,
Hi, Rafał!
Quoted 13 lines
It seems that kernel 5.11 broke spi-nor on Broadcom Northstar (BCM5301X) platforms.
The problem seems to be spi_nor_spimem_read_data() which calculates:
op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
On Northstar this happens to be:
op.dummy.nbytes = (0 * 0) / 8;
That results in bcm_qspi_bspi_set_flex_mode() dividing by zero in the:
bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;
Quoted 8 lines
Could you take a look at that issue, please?
GOOD    5.10.55
BAD     5.11.22
BAD     5.12.19
BAD     5.13.2
BAD     5.13.7
Quoted 2 lines
It's hard to guess. Would you please bisect and identify the commit that introduces the regression?
I think the bug is pretty obvious here. op->dummy.buswidth is 0 when there is no dummy phase, and that's why there is a division by zero. The controller driver does not check if the dummy phase exists (by checking op->dummy.nbytes) before performing the calculation. I saw a similar patch posted for spi-cadence-quadspi.c [0]. The fix is obvious IMO.

Quoted 3 lines

BTW, I think this was introduced by 0e30f47232ab ("mtd: spi-nor: add support for DTR protocol"). It set buswidths of non-existent phases to 0.

I see. Ideally this should have been done in a dedicated patch ensuring that all the controllers that expose the mem_ops are handled.

Quoted 8 lines

The main question is: do we want to keep the buswidth 0 when the dummy phase does not exist? It seems to be tripping up controller drivers. FWIW, I think we should keep it 0 since I think that when dummy.nbytes == 0 the other fields should be "don't care". The responsibility should lie on the controller driver to check this.
Thoughts?

I'm fine with keeping the buswidth 0 when the dummy phase does not exist. Would you please check all the controllers that may get trapped in this and fix all in a single patch?

Thanks,
ta

Quoted 62 lines

[0] https://patchwork.kernel.org/project/spi-devel-general/patch/[email protected]/
Quoted 46 lines
Thanks,
ta
Quoted 42 lines
[    1.075513] Division by zero in kernel.
[    1.079354] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.7 #18
[    1.085376] Hardware name: BCM5301X
[    1.088873] [<c0108394>] (unwind_backtrace) from [<c010498c>] (show_stack+0x10/0x14)
[    1.096666] [<c010498c>] (show_stack) from [<c0696470>] (dump_stack+0x94/0xa8)
[    1.103926] [<c0696470>] (dump_stack) from [<c03e7f94>] (Ldiv0+0x8/0x10)
[    1.110653] [<c03e7f94>] (Ldiv0) from [<c0699274>] (bcm_qspi_exec_mem_op+0x3e0/0x744)
[    1.118512] [<c0699274>] (bcm_qspi_exec_mem_op) from [<c0698740>] (spi_mem_exec_op+0x184/0x4fc) [    1.127234] [<c0698740>] (spi_mem_exec_op) from [<c0698bac>] (spi_mem_dirmap_read+0xf4/0x1c8) [    1.135780] [<c0698bac>] (spi_mem_dirmap_read) from [<c0697d58>] (spi_nor_spimem_read_data+0x13c/0x1ec) [    1.145199] [<c0697d58>] (spi_nor_spimem_read_data) from [<c0498d60>] (spi_nor_read+0x16c/0x174) [    1.154008] [<c0498d60>] (spi_nor_read) from [<c04835d0>] (mtd_read_oob_std+0x9c/0xa4) [    1.161964] [<c04835d0>] (mtd_read_oob_std) from [<c04855d0>] (mtd_read_oob+0x84/0x148) [    1.169997] [<c04855d0>] (mtd_read_oob) from [<c04856f4>] (mtd_read+0x60/0x90)
[    1.177237] [<c04856f4>] (mtd_read) from [<c048ab50>] (bcm47xxpart_parse+0x1d4/0x744)
[    1.185089] [<c048ab50>] (bcm47xxpart_parse) from [<c0488568>] (parse_mtd_partitions+0x188/0x424) [    1.193985] [<c0488568>] (parse_mtd_partitions) from [<c0486018>] (mtd_device_parse_register+0x7c/0x1c0) [    1.203489] [<c0486018>] (mtd_device_parse_register) from [<c04998b8>] (spi_nor_probe+0x20c/0x2d0) [    1.212471] [<c04998b8>] (spi_nor_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.220245] [<c046fbf8>] (really_probe) from [<c046dd40>] (bus_for_each_drv+0x80/0xd0) [    1.228184] [<c046dd40>] (bus_for_each_drv) from [<c04701d0>] (__device_attach+0xf8/0x15c) [    1.236468] [<c04701d0>] (__device_attach) from [<c046edd4>] (bus_probe_device+0x84/0x8c) [    1.244668] [<c046edd4>] (bus_probe_device) from [<c046c6c4>] (device_add+0x300/0x840) [    1.252606] [<c046c6c4>] (device_add) from [<c04b3dc4>] (spi_add_device+0x9c/0x164)
[    1.260292] [<c04b3dc4>] (spi_add_device) from [<c04b482c>] (spi_register_controller+0x8ac/0xbc0) [    1.269187] [<c04b482c>] (spi_register_controller) from [<c04b7bd4>] (bcm_qspi_probe+0x600/0x700) [    1.278092] [<c04b7bd4>] (bcm_qspi_probe) from [<c0471d3c>] (platform_probe+0x48/0x8c) [    1.286030] [<c0471d3c>] (platform_probe) from [<c046fbf8>] (really_probe+0xf0/0x4dc)
[    1.293880] [<c046fbf8>] (really_probe) from [<c04705dc>] (device_driver_attach+0xf0/0x100) [    1.302254] [<c04705dc>] (device_driver_attach) from [<c0470678>] (__driver_attach+0x8c/0x11c) [    1.310888] [<c0470678>] (__driver_attach) from [<c046dc74>] (bus_for_each_dev+0x74/0xc0) [    1.319086] [<c046dc74>] (bus_for_each_dev) from [<c046efc8>] (bus_add_driver+0xf4/0x1dc) [    1.327286] [<c046efc8>] (bus_add_driver) from [<c0470cdc>] (driver_register+0x88/0x118) [    1.335397] [<c0470cdc>] (driver_register) from [<c01016dc>] (do_one_initcall+0x54/0x1d0) [    1.343598] [<c01016dc>] (do_one_initcall) from [<c08010e8>] (kernel_init_freeable+0x244/0x2ac) [    1.352337] [<c08010e8>] (kernel_init_freeable) from [<c069a7c8>] (kernel_init+0x8/0x118) [    1.360536] [<c069a7c8>] (kernel_init) from [<c0100130>] (ret_from_fork+0x14/0x24)
[    1.368125] Exception stack(0xc1035fb0 to 0xc1035ff8)
[    1.373184] 5fa0: 00000000 00000000 00000000 00000000
[    1.381384] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [    1.389582] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Quoted 7 lines
Quoted 3 lines
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--
Regards,
Pratyush Yadav
Texas Instruments Inc.