Xi Wang 60c3becfd1 RDMA/hns: Fix sg offset non-zero issue ... When run perftest in many times, the system will report a BUG as follows: BUG: Bad rss-counter state mm:(____ptrval____) idx:0 val:-1 BUG: Bad rss-counter state mm:(____ptrval____) idx:1 val:1 We tested with different kernel version and found it started from the the following commit: commit d10bcf947a ("RDMA/umem: Combine contiguous PAGE_SIZE regions in SGEs") In this commit, the sg->offset is always 0 when sg_set_page() is called in ib_umem_get() and the drivers are not allowed to change the sgl, otherwise it will get bad page descriptor when unfolding SGEs in __ib_umem_release() as sg_page_count() will get wrong result while sgl->offset is not 0. However, there is a weird sgl usage in the current hns driver, the driver modified sg->offset after calling ib_umem_get(), which caused we iterate past the wrong number of pages in for_each_sg_page iterator. This patch fixes it by correcting the non-standard sgl usage found in the hns_roce_db_map_user() function. Fixes: d10bcf947a ("RDMA/umem: Combine contiguous PAGE_SIZE regions in SGEs") Fixes: 0425e3e6e0 ("RDMA/hns: Support flush cqe for hip08 in kernel space") Link: https://lore.kernel.org/r/1562808737-45723-1-git-send-email-oulijun@huawei.com Signed-off-by: Xi Wang <wangxi11@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>		2019-07-22 14:44:08 -03:00
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bnxt_re	Linux 5.2-rc6	2019-06-28 21:18:23 -03:00
cxgb3	IB: Remove unneeded memset	2019-07-03 14:26:49 -03:00
cxgb4	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
efa	RDMA/efa: Entropy in admin commands id	2019-07-04 14:31:09 -03:00
hfi1	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
hns	RDMA/hns: Fix sg offset non-zero issue	2019-07-22 14:44:08 -03:00
i40iw	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
mlx4	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
mlx5	RDMA/mlx5: Set RDMA DIM to be enabled by default	2019-07-08 16:37:22 -03:00
mthca	IB: Remove unneeded memset	2019-07-03 14:26:49 -03:00
ocrdma	IB: Remove unneeded memset	2019-07-03 14:26:49 -03:00
qedr	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
qib	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
usnic	5.3 Merge window RDMA pull request	2019-07-15 20:38:15 -07:00
vmw_pvrdma	Linux 5.2-rc6	2019-06-28 21:18:23 -03:00
Makefile	rdma: Remove nes	2019-06-13 09:59:49 -04:00