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Date: Wed, 2 Sep 2020 14:47:31 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Dmitry Osipenko <digetx@...il.com>,
Lee Jones <lee.jones@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
Sebastian Reichel <sre@...nel.org>,
Lubomir Rintel <lkundrak@...sk>,
Mark Brown <broonie@...nel.org>
Cc: devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-leds@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
Jerome Brunet <jbrunet@...libre.com>,
Neil Armstrong <narmstrong@...libre.com>,
Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH v2 2/6] regmap: Use flexible sleep
Hi Dmitry,
On 30.08.2020 20:53, Dmitry Osipenko wrote:
> The multi-reg write function uses udelay(), which is a busy-loop based
> delaying function that is not suitable for a long delays. Hence let's
> replace the udelay() with fsleep(), which is flexible sleep function that
> selects best delay function based on the delay-time.
>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
This patch landed in today's linux-next (20200902) as commit
2b32d2f7ce0a. Sadly it breaks booting of ARM 64bit Amlogic S922X based
Odroid N2 board. Here is the log:
BUG: scheduling while atomic: kworker/4:1/46/0x00000003
5 locks held by kworker/4:1/46:
#0: ffff0000dfc06738 ((wq_completion)events){+.+.}-{0:0}, at:
process_one_work+0x200/0x718
#1: ffff80001320bdd0 (deferred_probe_work){+.+.}-{0:0}, at:
process_one_work+0x200/0x718
#2: ffff0000df4b6188 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x3c/0x150
#3: ffff800012306e70 (enable_lock){+.+.}-{2:2}, at:
clk_enable_lock+0x48/0x128
#4: ffff0000de01c418 (syscon:110:(&syscon_config)->lock){+.+.}-{2:2},
at: regmap_lock_spinlock+0x14/0x28
Modules linked in:
CPU: 4 PID: 46 Comm: kworker/4:1 Not tainted 5.9.0-rc2+ #1570
Hardware name: Hardkernel ODROID-N2 (DT)
Workqueue: events deferred_probe_work_func
Call trace:
dump_backtrace+0x0/0x1d0
show_stack+0x14/0x20
dump_stack+0xec/0x16c
__schedule_bug+0x64/0x98
__schedule+0x7e0/0x8a0
schedule+0x78/0x118
schedule_hrtimeout_range_clock+0x84/0x108
schedule_hrtimeout_range+0x10/0x18
usleep_range+0x88/0xb8
_regmap_multi_reg_write+0x188/0x4e0
regmap_multi_reg_write+0x38/0x58
meson_clk_pll_init+0x80/0xd8
meson_clk_pcie_pll_enable+0x48/0xd8
clk_core_enable+0xc8/0x2b0
clk_core_enable+0xa8/0x2b0
clk_core_enable+0xa8/0x2b0
clk_core_enable+0xa8/0x2b0
clk_core_enable_lock+0x20/0x40
clk_enable+0x14/0x28
phy_g12a_usb3_pcie_probe+0x130/0x210
platform_drv_probe+0x50/0xa8
really_probe+0x110/0x400
driver_probe_device+0x54/0xb8
__device_attach_driver+0x90/0xc0
bus_for_each_drv+0x70/0xc8
__device_attach+0xec/0x150
device_initial_probe+0x10/0x18
bus_probe_device+0x94/0xa0
deferred_probe_work_func+0x70/0xa8
process_one_work+0x2a8/0x718
worker_thread+0x48/0x460
kthread+0x134/0x160
ret_from_fork+0x10/0x1c
BUG: sleeping function called from invalid context at mm/slab.h:498
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 46, name: kworker/4:1
3 locks held by kworker/4:1/46:
#0: ffff0000dfc06738 ((wq_completion)events){+.+.}-{0:0}, at:
process_one_work+0x200/0x718
#1: ffff80001320bdd0 (deferred_probe_work){+.+.}-{0:0}, at:
process_one_work+0x200/0x718
#2: ffff0000df4b6188 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x3c/0x150
CPU: 4 PID: 46 Comm: kworker/4:1 Tainted: G W 5.9.0-rc2+ #1570
Hardware name: Hardkernel ODROID-N2 (DT)
Workqueue: events deferred_probe_work_func
Call trace:
dump_backtrace+0x0/0x1d0
show_stack+0x14/0x20
dump_stack+0xec/0x16c
___might_sleep+0x1d4/0x1f8
__might_sleep+0x4c/0x88
slab_pre_alloc_hook.constprop.96+0xf4/0x138
__kmalloc_node_track_caller+0x6c/0x288
devres_alloc_node+0x54/0xc0
devm_reset_control_array_get+0x34/0xc0
phy_g12a_usb3_pcie_probe+0x148/0x210
platform_drv_probe+0x50/0xa8
really_probe+0x110/0x400
driver_probe_device+0x54/0xb8
__device_attach_driver+0x90/0xc0
bus_for_each_drv+0x70/0xc8
__device_attach+0xec/0x150
device_initial_probe+0x10/0x18
bus_probe_device+0x94/0xa0
deferred_probe_work_func+0x70/0xa8
process_one_work+0x2a8/0x718
worker_thread+0x48/0x460
kthread+0x134/0x160
ret_from_fork+0x10/0x1c
------------[ cut here ]------------
kernel BUG at mm/vmalloc.c:2066!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 4 PID: 46 Comm: kworker/4:1 Tainted: G W 5.9.0-rc2+ #1570
Hardware name: Hardkernel ODROID-N2 (DT)
Workqueue: events deferred_probe_work_func
pstate: 00000005 (nzcv daif -PAN -UAO BTYPE=--)
pc : __get_vm_area_node+0x190/0x198
lr : get_vm_area_caller+0x34/0x40
sp : ffff80001320b9f0
x29: ffff80001320b9f0 x28: ffff8000124bf68d
x27: ffff0000e47ce005 x26: ffff0000e484a6a8
x25: 0000000000000009 x24: ffff80001220f000
x23: 0068000000000707 x22: ffff800010531544
x21: 0000000000000000 x20: 00000000ffe09000
x19: 0000000000001000 x18: ffffffffffffffff
x17: 0000000089f66c61 x16: 00000000b502d7d1
x15: ffff80001220fa48 x14: ffff0000de6df18a
x13: ffff0000de6df189 x12: 0000000000000030
x11: 0000000000000003 x10: ffff8000124f8c58
x9 : 0000000000000000 x8 : 00000000fffffffe
x7 : ffff800010531544 x6 : 0000000000000cc0
x5 : 00000000ffffffff x4 : fffffdffbfff0000
x3 : ffff800010000000 x2 : 0000000000000001
x1 : 0000000000000001 x0 : 0000000000001000
Call trace:
__get_vm_area_node+0x190/0x198
__ioremap_caller+0x68/0xe0
__ioremap+0x38/0x40
__devm_ioremap+0x7c/0xf8
__devm_ioremap_resource+0xa8/0x160
devm_ioremap_resource+0x10/0x18
devm_platform_get_and_ioremap_resource+0x70/0x78
devm_platform_ioremap_resource+0x10/0x18
dwc3_meson_g12a_probe+0x60/0x518
platform_drv_probe+0x50/0xa8
really_probe+0x110/0x400
driver_probe_device+0x54/0xb8
__device_attach_driver+0x90/0xc0
bus_for_each_drv+0x70/0xc8
__device_attach+0xec/0x150
device_initial_probe+0x10/0x18
bus_probe_device+0x94/0xa0
deferred_probe_work_func+0x70/0xa8
process_one_work+0x2a8/0x718
worker_thread+0x48/0x460
kthread+0x134/0x160
ret_from_fork+0x10/0x1c
Code: cb010000 11000400 17ffffe8 d503201f (d4210000)
---[ end trace b621320ae7bce6b7 ]---
Kernel panic - not syncing: Aiee, killing interrupt handler!
SMP: stopping secondary CPUs
Kernel Offset: disabled
CPU features: 0x0240002,20082004
Memory Limit: none
---[ end Kernel panic - not syncing: Aiee, killing interrupt handler! ]---
Reverting this commit on top of current linux-next fixes board booting.
> ---
> drivers/base/regmap/regmap.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
> index e93700af7e6e..a417cb1a11dc 100644
> --- a/drivers/base/regmap/regmap.c
> +++ b/drivers/base/regmap/regmap.c
> @@ -2231,7 +2231,7 @@ static int _regmap_range_multi_paged_reg_write(struct regmap *map,
> return ret;
>
> if (regs[i].delay_us)
> - udelay(regs[i].delay_us);
> + fsleep(regs[i].delay_us);
>
> base += n;
> n = 0;
> @@ -2268,7 +2268,7 @@ static int _regmap_multi_reg_write(struct regmap *map,
> return ret;
>
> if (regs[i].delay_us)
> - udelay(regs[i].delay_us);
> + fsleep(regs[i].delay_us);
> }
> return 0;
> }
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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