* [PATCH] software node: balance refcount for managed sw nodes
@ 2021-09-27 10:22 Laurentiu Tudor
2021-09-27 12:17 ` Greg KH
0 siblings, 1 reply; 5+ messages in thread
From: Laurentiu Tudor @ 2021-09-27 10:22 UTC (permalink / raw)
To: gregkh; +Cc: heikki.krogerus, jon, rafael.j.wysocki, Laurentiu Tudor, stable
software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed
software nodes, thus leading to underflow errors. Balance the refcount by
bumping it in the device_create_managed_software_node() function.
The error [1] was encountered after adding a .shutdown() op to our
fsl-mc-bus driver.
[Backported to stable from mainline commit
5aeb05b27f81 ("software node: balance refcount for managed software nodes")]
[1]
pc : refcount_warn_saturate+0xf8/0x150
lr : refcount_warn_saturate+0xf8/0x150
sp : ffff80001009b920
x29: ffff80001009b920 x28: ffff1a2420318000 x27: 0000000000000000
x26: ffffccac15e7a038 x25: 0000000000000008 x24: ffffccac168e0030
x23: ffff1a2428a82000 x22: 0000000000080000 x21: ffff1a24287b5000
x20: 0000000000000001 x19: ffff1a24261f4400 x18: ffffffffffffffff
x17: 6f72645f726f7272 x16: 0000000000000000 x15: ffff80009009b607
x14: 0000000000000000 x13: ffffccac16602670 x12: 0000000000000a17
x11: 000000000000035d x10: ffffccac16602670 x9 : ffffccac16602670
x8 : 00000000ffffefff x7 : ffffccac1665a670 x6 : ffffccac1665a670
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1a2420318000
Call trace:
refcount_warn_saturate+0xf8/0x150
kobject_put+0x10c/0x120
software_node_notify+0xd8/0x140
device_platform_notify+0x4c/0xb4
device_del+0x188/0x424
fsl_mc_device_remove+0x2c/0x4c
rebofind sp.c__fsl_mc_device_remove+0x14/0x2c
device_for_each_child+0x5c/0xac
dprc_remove+0x9c/0xc0
fsl_mc_driver_remove+0x28/0x64
__device_release_driver+0x188/0x22c
device_release_driver+0x30/0x50
bus_remove_device+0x128/0x134
device_del+0x16c/0x424
fsl_mc_bus_remove+0x8c/0x114
fsl_mc_bus_shutdown+0x14/0x20
platform_shutdown+0x28/0x40
device_shutdown+0x15c/0x330
__do_sys_reboot+0x218/0x2a0
__arm64_sys_reboot+0x28/0x34
invoke_syscall+0x48/0x114
el0_svc_common+0x40/0xdc
do_el0_svc+0x2c/0x94
el0_svc+0x2c/0x54
el0t_64_sync_handler+0xa8/0x12c
el0t_64_sync+0x198/0x19c
---[ end trace 32eb1c71c7d86821 ]---
Fixes: 151f6ff78cdf ("software node: Provide replacement for device_add_properties()")
Reported-by: Jon Nettleton <jon@solid-run.com>
Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: <stable@vger.kernel.org> # 5.12+
---
drivers/base/swnode.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index d1f1a8240120..bdb50a06c82a 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -1113,6 +1113,9 @@ int device_create_managed_software_node(struct device *dev,
to_swnode(fwnode)->managed = true;
set_secondary_fwnode(dev, fwnode);
+ if (device_is_registered(dev))
+ software_node_notify(dev, KOBJ_ADD);
+
return 0;
}
EXPORT_SYMBOL_GPL(device_create_managed_software_node);
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] software node: balance refcount for managed sw nodes
2021-09-27 10:22 [PATCH] software node: balance refcount for managed sw nodes Laurentiu Tudor
@ 2021-09-27 12:17 ` Greg KH
2021-09-27 12:42 ` Laurentiu Tudor
0 siblings, 1 reply; 5+ messages in thread
From: Greg KH @ 2021-09-27 12:17 UTC (permalink / raw)
To: Laurentiu Tudor; +Cc: heikki.krogerus, jon, rafael.j.wysocki, stable
On Mon, Sep 27, 2021 at 01:22:49PM +0300, Laurentiu Tudor wrote:
> software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed
> software nodes, thus leading to underflow errors. Balance the refcount by
> bumping it in the device_create_managed_software_node() function.
>
> The error [1] was encountered after adding a .shutdown() op to our
> fsl-mc-bus driver.
>
> [Backported to stable from mainline commit
> 5aeb05b27f81 ("software node: balance refcount for managed software nodes")]
>
> [1]
> pc : refcount_warn_saturate+0xf8/0x150
> lr : refcount_warn_saturate+0xf8/0x150
> sp : ffff80001009b920
> x29: ffff80001009b920 x28: ffff1a2420318000 x27: 0000000000000000
> x26: ffffccac15e7a038 x25: 0000000000000008 x24: ffffccac168e0030
> x23: ffff1a2428a82000 x22: 0000000000080000 x21: ffff1a24287b5000
> x20: 0000000000000001 x19: ffff1a24261f4400 x18: ffffffffffffffff
> x17: 6f72645f726f7272 x16: 0000000000000000 x15: ffff80009009b607
> x14: 0000000000000000 x13: ffffccac16602670 x12: 0000000000000a17
> x11: 000000000000035d x10: ffffccac16602670 x9 : ffffccac16602670
> x8 : 00000000ffffefff x7 : ffffccac1665a670 x6 : ffffccac1665a670
> x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff
> x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1a2420318000
> Call trace:
> refcount_warn_saturate+0xf8/0x150
> kobject_put+0x10c/0x120
> software_node_notify+0xd8/0x140
> device_platform_notify+0x4c/0xb4
> device_del+0x188/0x424
> fsl_mc_device_remove+0x2c/0x4c
> rebofind sp.c__fsl_mc_device_remove+0x14/0x2c
> device_for_each_child+0x5c/0xac
> dprc_remove+0x9c/0xc0
> fsl_mc_driver_remove+0x28/0x64
> __device_release_driver+0x188/0x22c
> device_release_driver+0x30/0x50
> bus_remove_device+0x128/0x134
> device_del+0x16c/0x424
> fsl_mc_bus_remove+0x8c/0x114
> fsl_mc_bus_shutdown+0x14/0x20
> platform_shutdown+0x28/0x40
> device_shutdown+0x15c/0x330
> __do_sys_reboot+0x218/0x2a0
> __arm64_sys_reboot+0x28/0x34
> invoke_syscall+0x48/0x114
> el0_svc_common+0x40/0xdc
> do_el0_svc+0x2c/0x94
> el0_svc+0x2c/0x54
> el0t_64_sync_handler+0xa8/0x12c
> el0t_64_sync+0x198/0x19c
> ---[ end trace 32eb1c71c7d86821 ]---
>
> Fixes: 151f6ff78cdf ("software node: Provide replacement for device_add_properties()")
> Reported-by: Jon Nettleton <jon@solid-run.com>
> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
> Cc: <stable@vger.kernel.org> # 5.12+
> ---
> drivers/base/swnode.c | 3 +++
> 1 file changed, 3 insertions(+)
Next time, please include the git commit id of this patch that is
already in Linus's tree so that I don't have to go and manually look it
up...
thanks,
greg k-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] software node: balance refcount for managed sw nodes
2021-09-27 12:17 ` Greg KH
@ 2021-09-27 12:42 ` Laurentiu Tudor
2021-09-27 13:34 ` Greg KH
2021-09-27 13:36 ` Heikki Krogerus
0 siblings, 2 replies; 5+ messages in thread
From: Laurentiu Tudor @ 2021-09-27 12:42 UTC (permalink / raw)
To: Greg KH; +Cc: heikki.krogerus, jon, rafael.j.wysocki, stable
On 9/27/2021 3:17 PM, Greg KH wrote:
> On Mon, Sep 27, 2021 at 01:22:49PM +0300, Laurentiu Tudor wrote:
>> software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed
>> software nodes, thus leading to underflow errors. Balance the refcount by
>> bumping it in the device_create_managed_software_node() function.
>>
>> The error [1] was encountered after adding a .shutdown() op to our
>> fsl-mc-bus driver.
>>
>> [Backported to stable from mainline commit
>> 5aeb05b27f81 ("software node: balance refcount for managed software nodes")]
But ...
>> [1]
>> pc : refcount_warn_saturate+0xf8/0x150
>> lr : refcount_warn_saturate+0xf8/0x150
>> sp : ffff80001009b920
>> x29: ffff80001009b920 x28: ffff1a2420318000 x27: 0000000000000000
>> x26: ffffccac15e7a038 x25: 0000000000000008 x24: ffffccac168e0030
>> x23: ffff1a2428a82000 x22: 0000000000080000 x21: ffff1a24287b5000
>> x20: 0000000000000001 x19: ffff1a24261f4400 x18: ffffffffffffffff
>> x17: 6f72645f726f7272 x16: 0000000000000000 x15: ffff80009009b607
>> x14: 0000000000000000 x13: ffffccac16602670 x12: 0000000000000a17
>> x11: 000000000000035d x10: ffffccac16602670 x9 : ffffccac16602670
>> x8 : 00000000ffffefff x7 : ffffccac1665a670 x6 : ffffccac1665a670
>> x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff
>> x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1a2420318000
>> Call trace:
>> refcount_warn_saturate+0xf8/0x150
>> kobject_put+0x10c/0x120
>> software_node_notify+0xd8/0x140
>> device_platform_notify+0x4c/0xb4
>> device_del+0x188/0x424
>> fsl_mc_device_remove+0x2c/0x4c
>> rebofind sp.c__fsl_mc_device_remove+0x14/0x2c
>> device_for_each_child+0x5c/0xac
>> dprc_remove+0x9c/0xc0
>> fsl_mc_driver_remove+0x28/0x64
>> __device_release_driver+0x188/0x22c
>> device_release_driver+0x30/0x50
>> bus_remove_device+0x128/0x134
>> device_del+0x16c/0x424
>> fsl_mc_bus_remove+0x8c/0x114
>> fsl_mc_bus_shutdown+0x14/0x20
>> platform_shutdown+0x28/0x40
>> device_shutdown+0x15c/0x330
>> __do_sys_reboot+0x218/0x2a0
>> __arm64_sys_reboot+0x28/0x34
>> invoke_syscall+0x48/0x114
>> el0_svc_common+0x40/0xdc
>> do_el0_svc+0x2c/0x94
>> el0_svc+0x2c/0x54
>> el0t_64_sync_handler+0xa8/0x12c
>> el0t_64_sync+0x198/0x19c
>> ---[ end trace 32eb1c71c7d86821 ]---
>>
>> Fixes: 151f6ff78cdf ("software node: Provide replacement for device_add_properties()")
>> Reported-by: Jon Nettleton <jon@solid-run.com>
>> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
>> Cc: <stable@vger.kernel.org> # 5.12+
>> ---
>> drivers/base/swnode.c | 3 +++
>> 1 file changed, 3 insertions(+)
>
> Next time, please include the git commit id of this patch that is
> already in Linus's tree so that I don't have to go and manually look it
> up...
>
... i did mention the mainline commit in the description. Maybe there's
a mix up with the previous submission, or i should have used a special
syntax that i'm not aware of...
Anyway, thanks for picking this up.
---
Best Regards, Laurentiu
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] software node: balance refcount for managed sw nodes
2021-09-27 12:42 ` Laurentiu Tudor
@ 2021-09-27 13:34 ` Greg KH
2021-09-27 13:36 ` Heikki Krogerus
1 sibling, 0 replies; 5+ messages in thread
From: Greg KH @ 2021-09-27 13:34 UTC (permalink / raw)
To: Laurentiu Tudor; +Cc: heikki.krogerus, jon, rafael.j.wysocki, stable
On Mon, Sep 27, 2021 at 03:42:42PM +0300, Laurentiu Tudor wrote:
>
> On 9/27/2021 3:17 PM, Greg KH wrote:
> > On Mon, Sep 27, 2021 at 01:22:49PM +0300, Laurentiu Tudor wrote:
> >> software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed
> >> software nodes, thus leading to underflow errors. Balance the refcount by
> >> bumping it in the device_create_managed_software_node() function.
> >>
> >> The error [1] was encountered after adding a .shutdown() op to our
> >> fsl-mc-bus driver.
> >>
> >> [Backported to stable from mainline commit
> >> 5aeb05b27f81 ("software node: balance refcount for managed software nodes")]
>
> But ...
Ah, missed that up here in the middle of the changelog text, sorry.
greg k-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] software node: balance refcount for managed sw nodes
2021-09-27 12:42 ` Laurentiu Tudor
2021-09-27 13:34 ` Greg KH
@ 2021-09-27 13:36 ` Heikki Krogerus
1 sibling, 0 replies; 5+ messages in thread
From: Heikki Krogerus @ 2021-09-27 13:36 UTC (permalink / raw)
To: Laurentiu Tudor; +Cc: Greg KH, jon, rafael.j.wysocki, stable
On Mon, Sep 27, 2021 at 03:42:42PM +0300, Laurentiu Tudor wrote:
>
> On 9/27/2021 3:17 PM, Greg KH wrote:
> > On Mon, Sep 27, 2021 at 01:22:49PM +0300, Laurentiu Tudor wrote:
> >> software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed
> >> software nodes, thus leading to underflow errors. Balance the refcount by
> >> bumping it in the device_create_managed_software_node() function.
> >>
> >> The error [1] was encountered after adding a .shutdown() op to our
> >> fsl-mc-bus driver.
> >>
> >> [Backported to stable from mainline commit
> >> 5aeb05b27f81 ("software node: balance refcount for managed software nodes")]
>
> But ...
>
> >> [1]
> >> pc : refcount_warn_saturate+0xf8/0x150
> >> lr : refcount_warn_saturate+0xf8/0x150
> >> sp : ffff80001009b920
> >> x29: ffff80001009b920 x28: ffff1a2420318000 x27: 0000000000000000
> >> x26: ffffccac15e7a038 x25: 0000000000000008 x24: ffffccac168e0030
> >> x23: ffff1a2428a82000 x22: 0000000000080000 x21: ffff1a24287b5000
> >> x20: 0000000000000001 x19: ffff1a24261f4400 x18: ffffffffffffffff
> >> x17: 6f72645f726f7272 x16: 0000000000000000 x15: ffff80009009b607
> >> x14: 0000000000000000 x13: ffffccac16602670 x12: 0000000000000a17
> >> x11: 000000000000035d x10: ffffccac16602670 x9 : ffffccac16602670
> >> x8 : 00000000ffffefff x7 : ffffccac1665a670 x6 : ffffccac1665a670
> >> x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff
> >> x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1a2420318000
> >> Call trace:
> >> refcount_warn_saturate+0xf8/0x150
> >> kobject_put+0x10c/0x120
> >> software_node_notify+0xd8/0x140
> >> device_platform_notify+0x4c/0xb4
> >> device_del+0x188/0x424
> >> fsl_mc_device_remove+0x2c/0x4c
> >> rebofind sp.c__fsl_mc_device_remove+0x14/0x2c
> >> device_for_each_child+0x5c/0xac
> >> dprc_remove+0x9c/0xc0
> >> fsl_mc_driver_remove+0x28/0x64
> >> __device_release_driver+0x188/0x22c
> >> device_release_driver+0x30/0x50
> >> bus_remove_device+0x128/0x134
> >> device_del+0x16c/0x424
> >> fsl_mc_bus_remove+0x8c/0x114
> >> fsl_mc_bus_shutdown+0x14/0x20
> >> platform_shutdown+0x28/0x40
> >> device_shutdown+0x15c/0x330
> >> __do_sys_reboot+0x218/0x2a0
> >> __arm64_sys_reboot+0x28/0x34
> >> invoke_syscall+0x48/0x114
> >> el0_svc_common+0x40/0xdc
> >> do_el0_svc+0x2c/0x94
> >> el0_svc+0x2c/0x54
> >> el0t_64_sync_handler+0xa8/0x12c
> >> el0t_64_sync+0x198/0x19c
> >> ---[ end trace 32eb1c71c7d86821 ]---
> >>
> >> Fixes: 151f6ff78cdf ("software node: Provide replacement for device_add_properties()")
> >> Reported-by: Jon Nettleton <jon@solid-run.com>
> >> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> >> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> >> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
> >> Cc: <stable@vger.kernel.org> # 5.12+
> >> ---
> >> drivers/base/swnode.c | 3 +++
> >> 1 file changed, 3 insertions(+)
> >
> > Next time, please include the git commit id of this patch that is
> > already in Linus's tree so that I don't have to go and manually look it
> > up...
> >
>
> ... i did mention the mainline commit in the description. Maybe there's
> a mix up with the previous submission, or i should have used a special
> syntax that i'm not aware of...
The syntax is defined in the documentation:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> Anyway, thanks for picking this up.
thanks,
--
heikki
^ permalink raw reply [flat|nested] 5+ messages in thread
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2021-09-27 10:22 [PATCH] software node: balance refcount for managed sw nodes Laurentiu Tudor
2021-09-27 12:17 ` Greg KH
2021-09-27 12:42 ` Laurentiu Tudor
2021-09-27 13:34 ` Greg KH
2021-09-27 13:36 ` Heikki Krogerus
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