diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-01-04 00:28:18 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-01-04 03:26:59 +0300 |
| commit | 02ee9da347873699603d9ce0112a80b5dd69dea1 (patch) | |
| tree | 4d04019bb44ae3142bc1844027cae4db99e68512 /drivers/infiniband/core/device.c | |
| parent | 3cc297db970762024109f75ce289078f8479a2f8 (diff) | |
| download | linux-02ee9da347873699603d9ce0112a80b5dd69dea1.tar.xz | |
IB/core: Fix two kernel warnings triggered by rxe registration
Eliminate the WARN_ONs that create following two warnings 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
The code should accept either a parent pointer or a fully specified DMA
specification without producing warnings.
Fixes: 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
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/core/device.c')
| -rw-r--r-- | drivers/infiniband/core/device.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index a8757b5552de..5c9934b1e598 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 +454,25 @@ 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 (!device->dev.dma_mask) { + if (parent) + device->dev.dma_mask = parent->dma_mask; + else + WARN_ON_ONCE(true); + } + if (!device->dev.coherent_dma_mask) { + if (parent) + device->dev.coherent_dma_mask = + parent->coherent_dma_mask; + else + WARN_ON_ONCE(true); + } } 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; } |