* [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration
@ 2017-12-22 21:38 Bart Van Assche
2017-12-25 10:28 ` Leon Romanovsky
0 siblings, 1 reply; 4+ messages in thread
From: Bart Van Assche @ 2017-12-22 21:38 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Doug Ledford, linux-rdma, Bart Van Assche, Leon Romanovsky,
stable
Avoid that the following two warnings are reported when registering an
rxe device:
WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/device.c:449 ib_register_device+0x591/0x640 [ib_core]
CPU: 2 PID: 1005 Comm: run_tests Not tainted 4.15.0-rc4-dbg+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:ib_register_device+0x591/0x640 [ib_core]
Call Trace:
rxe_register_device+0x3c6/0x470 [rdma_rxe]
rxe_add+0x543/0x5e0 [rdma_rxe]
rxe_net_add+0x37/0xb0 [rdma_rxe]
rxe_param_set_add+0x5a/0x120 [rdma_rxe]
param_attr_store+0x5e/0xc0
module_attr_store+0x19/0x30
sysfs_kf_write+0x3d/0x50
kernfs_fop_write+0x116/0x1a0
__vfs_write+0x23/0x120
vfs_write+0xbe/0x1b0
SyS_write+0x44/0xa0
entry_SYSCALL_64_fastpath+0x23/0x9a
WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/sysfs.c:1279 ib_device_register_sysfs+0x11d/0x160 [ib_core]
CPU: 2 PID: 1005 Comm: run_tests Tainted: G W 4.15.0-rc4-dbg+ #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:ib_device_register_sysfs+0x11d/0x160 [ib_core]
Call Trace:
ib_register_device+0x3f7/0x640 [ib_core]
rxe_register_device+0x3c6/0x470 [rdma_rxe]
rxe_add+0x543/0x5e0 [rdma_rxe]
rxe_net_add+0x37/0xb0 [rdma_rxe]
rxe_param_set_add+0x5a/0x120 [rdma_rxe]
param_attr_store+0x5e/0xc0
module_attr_store+0x19/0x30
sysfs_kf_write+0x3d/0x50
kernfs_fop_write+0x116/0x1a0
__vfs_write+0x23/0x120
vfs_write+0xbe/0x1b0
SyS_write+0x44/0xa0
entry_SYSCALL_64_fastpath+0x23/0x9a
Fixes: commit 99db9494035f ("IB/core: Remove ib_device.dma_device")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: stable@vger.kernel.org # v4.11
---
drivers/infiniband/core/device.c | 2 +-
drivers/infiniband/core/sysfs.c | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 30914f3baa5f..b9d7570e9989 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -446,7 +446,6 @@ int ib_register_device(struct ib_device *device,
struct ib_udata uhw = {.outlen = 0, .inlen = 0};
struct device *parent = device->dev.parent;
- WARN_ON_ONCE(!parent);
WARN_ON_ONCE(device->dma_device);
if (device->dev.dma_ops) {
/*
@@ -465,6 +464,7 @@ int ib_register_device(struct ib_device *device,
* The caller did not provide custom DMA operations. Use the
* DMA mapping operations of the parent device.
*/
+ WARN_ON_ONCE(!parent);
device->dma_device = parent;
}
diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index e30d86fa1855..8ae1308eecc7 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -1276,7 +1276,6 @@ int ib_device_register_sysfs(struct ib_device *device,
int ret;
int i;
- WARN_ON_ONCE(!device->dev.parent);
ret = dev_set_name(class_dev, "%s", device->name);
if (ret)
return ret;
--
2.15.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration
2017-12-22 21:38 [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration Bart Van Assche
@ 2017-12-25 10:28 ` Leon Romanovsky
[not found] ` <20171225102839.GD2942-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
0 siblings, 1 reply; 4+ messages in thread
From: Leon Romanovsky @ 2017-12-25 10:28 UTC (permalink / raw)
To: Bart Van Assche; +Cc: Jason Gunthorpe, Doug Ledford, linux-rdma, stable
[-- Attachment #1: Type: text/plain, Size: 3410 bytes --]
On Fri, Dec 22, 2017 at 01:38:52PM -0800, Bart Van Assche wrote:
> Avoid that the following two warnings are reported when registering an
> rxe device:
>
> WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/device.c:449 ib_register_device+0x591/0x640 [ib_core]
> CPU: 2 PID: 1005 Comm: run_tests Not tainted 4.15.0-rc4-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> RIP: 0010:ib_register_device+0x591/0x640 [ib_core]
> Call Trace:
> rxe_register_device+0x3c6/0x470 [rdma_rxe]
> rxe_add+0x543/0x5e0 [rdma_rxe]
> rxe_net_add+0x37/0xb0 [rdma_rxe]
> rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> param_attr_store+0x5e/0xc0
> module_attr_store+0x19/0x30
> sysfs_kf_write+0x3d/0x50
> kernfs_fop_write+0x116/0x1a0
> __vfs_write+0x23/0x120
> vfs_write+0xbe/0x1b0
> SyS_write+0x44/0xa0
> entry_SYSCALL_64_fastpath+0x23/0x9a
>
> WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/sysfs.c:1279 ib_device_register_sysfs+0x11d/0x160 [ib_core]
> CPU: 2 PID: 1005 Comm: run_tests Tainted: G W 4.15.0-rc4-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> RIP: 0010:ib_device_register_sysfs+0x11d/0x160 [ib_core]
> Call Trace:
> ib_register_device+0x3f7/0x640 [ib_core]
> rxe_register_device+0x3c6/0x470 [rdma_rxe]
> rxe_add+0x543/0x5e0 [rdma_rxe]
> rxe_net_add+0x37/0xb0 [rdma_rxe]
> rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> param_attr_store+0x5e/0xc0
> module_attr_store+0x19/0x30
> sysfs_kf_write+0x3d/0x50
> kernfs_fop_write+0x116/0x1a0
> __vfs_write+0x23/0x120
> vfs_write+0xbe/0x1b0
> SyS_write+0x44/0xa0
> entry_SYSCALL_64_fastpath+0x23/0x9a
>
> Fixes: commit 99db9494035f ("IB/core: Remove ib_device.dma_device")
^^^^^^ redundant
> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
> Cc: Leon Romanovsky <leon@kernel.org>
> Cc: stable@vger.kernel.org # v4.11
> ---
> drivers/infiniband/core/device.c | 2 +-
> drivers/infiniband/core/sysfs.c | 1 -
> 2 files changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index 30914f3baa5f..b9d7570e9989 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -446,7 +446,6 @@ int ib_register_device(struct ib_device *device,
> struct ib_udata uhw = {.outlen = 0, .inlen = 0};
> struct device *parent = device->dev.parent;
>
> - WARN_ON_ONCE(!parent);
> WARN_ON_ONCE(device->dma_device);
> if (device->dev.dma_ops) {
I understand that it fixed warning for you, but why is it correct?
You are using "parent" in this "if (device->dev.dma_ops)" too.
> /*
> @@ -465,6 +464,7 @@ int ib_register_device(struct ib_device *device,
> * The caller did not provide custom DMA operations. Use the
> * DMA mapping operations of the parent device.
> */
> + WARN_ON_ONCE(!parent);
> device->dma_device = parent;
> }
>
> diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
> index e30d86fa1855..8ae1308eecc7 100644
> --- a/drivers/infiniband/core/sysfs.c
> +++ b/drivers/infiniband/core/sysfs.c
> @@ -1276,7 +1276,6 @@ int ib_device_register_sysfs(struct ib_device *device,
> int ret;
> int i;
>
> - WARN_ON_ONCE(!device->dev.parent);
> ret = dev_set_name(class_dev, "%s", device->name);
> if (ret)
> return ret;
> --
> 2.15.1
>
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration
[not found] ` <20171225102839.GD2942-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
@ 2017-12-27 22:56 ` Jason Gunthorpe
2018-01-03 17:08 ` Bart Van Assche
0 siblings, 1 reply; 4+ messages in thread
From: Jason Gunthorpe @ 2017-12-27 22:56 UTC (permalink / raw)
To: Leon Romanovsky
Cc: Bart Van Assche, Doug Ledford, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
stable-u79uwXL29TY76Z2rM5mHXA
On Mon, Dec 25, 2017 at 12:28:39PM +0200, Leon Romanovsky wrote:
> On Fri, Dec 22, 2017 at 01:38:52PM -0800, Bart Van Assche wrote:
> > Avoid that the following two warnings are reported when registering an
> > rxe device:
> >
> > WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/device.c:449 ib_register_device+0x591/0x640 [ib_core]
> > CPU: 2 PID: 1005 Comm: run_tests Not tainted 4.15.0-rc4-dbg+ #2
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> > RIP: 0010:ib_register_device+0x591/0x640 [ib_core]
> > Call Trace:
> > rxe_register_device+0x3c6/0x470 [rdma_rxe]
> > rxe_add+0x543/0x5e0 [rdma_rxe]
> > rxe_net_add+0x37/0xb0 [rdma_rxe]
> > rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> > param_attr_store+0x5e/0xc0
> > module_attr_store+0x19/0x30
> > sysfs_kf_write+0x3d/0x50
> > kernfs_fop_write+0x116/0x1a0
> > __vfs_write+0x23/0x120
> > vfs_write+0xbe/0x1b0
> > SyS_write+0x44/0xa0
> > entry_SYSCALL_64_fastpath+0x23/0x9a
> >
> > WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/sysfs.c:1279 ib_device_register_sysfs+0x11d/0x160 [ib_core]
> > CPU: 2 PID: 1005 Comm: run_tests Tainted: G W 4.15.0-rc4-dbg+ #2
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> > RIP: 0010:ib_device_register_sysfs+0x11d/0x160 [ib_core]
> > Call Trace:
> > ib_register_device+0x3f7/0x640 [ib_core]
> > rxe_register_device+0x3c6/0x470 [rdma_rxe]
> > rxe_add+0x543/0x5e0 [rdma_rxe]
> > rxe_net_add+0x37/0xb0 [rdma_rxe]
> > rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> > param_attr_store+0x5e/0xc0
> > module_attr_store+0x19/0x30
> > sysfs_kf_write+0x3d/0x50
> > kernfs_fop_write+0x116/0x1a0
> > __vfs_write+0x23/0x120
> > vfs_write+0xbe/0x1b0
> > SyS_write+0x44/0xa0
> > entry_SYSCALL_64_fastpath+0x23/0x9a
> >
> > Fixes: commit 99db9494035f ("IB/core: Remove ib_device.dma_device")
>
> ^^^^^^ redundant
>
> > Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
> > Cc: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org # v4.11
> > drivers/infiniband/core/device.c | 2 +-
> > drivers/infiniband/core/sysfs.c | 1 -
> > 2 files changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> > index 30914f3baa5f..b9d7570e9989 100644
> > +++ b/drivers/infiniband/core/device.c
> > @@ -446,7 +446,6 @@ int ib_register_device(struct ib_device *device,
> > struct ib_udata uhw = {.outlen = 0, .inlen = 0};
> > struct device *parent = device->dev.parent;
> >
> > - WARN_ON_ONCE(!parent);
> > WARN_ON_ONCE(device->dma_device);
> > if (device->dev.dma_ops) {
>
> I understand that it fixed warning for you, but why is it correct?
> You are using "parent" in this "if (device->dev.dma_ops)" too.
If no parent is specified then the caller must provide a full set of
DMA data and none should be copied from the parent.
Presumably rxe does this, and has no parent because it is a virtual
device.
I'm a little more worried about the ib_device_register_sysfs - why was
the WARN_ON ever there?
What do you think about this as a clarification Bart?
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index bb2686d56d3c65..c535c7803d80a7 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -446,7 +446,6 @@ int ib_register_device(struct ib_device *device,
struct ib_udata uhw = {.outlen = 0, .inlen = 0};
struct device *parent = device->dev.parent;
- WARN_ON_ONCE(!parent);
WARN_ON_ONCE(device->dma_device);
if (device->dev.dma_ops) {
/*
@@ -455,16 +454,20 @@ int ib_register_device(struct ib_device *device,
* into device->dev.
*/
device->dma_device = &device->dev;
- if (!device->dev.dma_mask)
- device->dev.dma_mask = parent->dma_mask;
- if (!device->dev.coherent_dma_mask)
- device->dev.coherent_dma_mask =
- parent->coherent_dma_mask;
+
+ if (parent) {
+ if (!device->dev.dma_mask)
+ device->dev.dma_mask = parent->dma_mask;
+ if (!device->dev.coherent_dma_mask)
+ device->dev.coherent_dma_mask =
+ parent->coherent_dma_mask;
+ }
} else {
/*
* The caller did not provide custom DMA operations. Use the
* DMA mapping operations of the parent device.
*/
+ WARN_ON_ONCE(!parent);
device->dma_device = parent;
}
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration
2017-12-27 22:56 ` Jason Gunthorpe
@ 2018-01-03 17:08 ` Bart Van Assche
0 siblings, 0 replies; 4+ messages in thread
From: Bart Van Assche @ 2018-01-03 17:08 UTC (permalink / raw)
To: jgg@ziepe.ca, leon@kernel.org
Cc: linux-rdma@vger.kernel.org, stable@vger.kernel.org,
dledford@redhat.com
On Wed, 2017-12-27 at 15:56 -0700, Jason Gunthorpe wrote:
> I'm a little more worried about the ib_device_register_sysfs - why was
> the WARN_ON ever there?
That WARN_ON() statement was introduced by commit 97a9ea848016 ("IB/core:
Initialize ib_device.dev.parent earlier"):
[ ... ]
diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index c1fb545e8d78..daadf3130c9f 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -1258,7 +1258,7 @@ int ib_device_register_sysfs(struct ib_device *device,
int ret;
int i;
- device->dev.parent = device->dma_device;
+ WARN_ON_ONCE(!device->dev.parent);
ret = dev_set_name(class_dev, "%s", device->name);
if (ret)
return ret;
[ ... ]
Since ib_device_register_sysfs() does not use the parent pointer in any way
I think it is sufficient to check the parent pointer in ib_register_device()
and to leave out any parent pointer checks from ib_device_register_sysfs().
> What do you think about this as a clarification Bart?
> [ ... ]
OK, I will add a parent pointer check in the code paths that dereference that
pointer.
Bart.
^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-01-03 17:08 UTC | newest]
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2017-12-22 21:38 [PATCH] IB/core: Fix two kernel warnings triggered by rxe registration Bart Van Assche
2017-12-25 10:28 ` Leon Romanovsky
[not found] ` <20171225102839.GD2942-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-12-27 22:56 ` Jason Gunthorpe
2018-01-03 17:08 ` Bart Van Assche
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