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authorKeith Busch <keith.busch@intel.com>2018-10-31 13:15:29 -0600
committerJens Axboe <axboe@kernel.dk>2018-11-02 08:14:46 -0600
commit9fe5c59ff6a1e5e26a39b75489a1420e7eaaf0b1 (patch)
tree4e5a5edf35e507d531ee778d75930e51df696b59 /mm
parentd19b8bc82fc232d17ec45ca148388e4ba05ac4b9 (diff)
downloadlinux-9fe5c59ff6a1e5e26a39b75489a1420e7eaaf0b1.tar.gz
nvme-pci: fix conflicting p2p resource adds
The nvme pci driver had been adding its CMB resource to the P2P DMA subsystem everytime on on a controller reset. This results in the following warning: ------------[ cut here ]------------ nvme 0000:00:03.0: Conflicting mapping in same section WARNING: CPU: 7 PID: 81 at kernel/memremap.c:155 devm_memremap_pages+0xa6/0x380 ... Call Trace: pci_p2pdma_add_resource+0x153/0x370 nvme_reset_work+0x28c/0x17b1 [nvme] ? add_timer+0x107/0x1e0 ? dequeue_entity+0x81/0x660 ? dequeue_entity+0x3b0/0x660 ? pick_next_task_fair+0xaf/0x610 ? __switch_to+0xbc/0x410 process_one_work+0x1cf/0x350 worker_thread+0x215/0x3d0 ? process_one_work+0x350/0x350 kthread+0x107/0x120 ? kthread_park+0x80/0x80 ret_from_fork+0x1f/0x30 ---[ end trace f7ea76ac6ee72727 ]--- nvme nvme0: failed to register the CMB This patch fixes this by registering the CMB with P2P only once. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm')
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