From: Mitko Haralanov Date: Tue, 12 Apr 2016 17:46:41 +0000 (-0700) Subject: IB/hfi1: Correctly compute node interval X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de79093b284888faedb826d8ecd326e5b6843d88;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git IB/hfi1: Correctly compute node interval The computation of the interval of an interval RB node was incorrect leading to data corruption due to the RB search algorithm not properly finding the all RB nodes in an MMU invalidation interval. The problem stemmed from the fact that the beginning address of the node's range was being aligned to a page boundary. For certain buffer sizes, this would lead to a end address calculation that was off by 1 page. An important aspect of keeping the RB same is also updating the node's range in the case it's being extended. Reviewed-by: Dean Luick Signed-off-by: Mitko Haralanov Signed-off-by: Doug Ledford --- diff --git a/drivers/staging/rdma/hfi1/mmu_rb.c b/drivers/staging/rdma/hfi1/mmu_rb.c index 72b6d70ae2b5..a1aaaeac4475 100644 --- a/drivers/staging/rdma/hfi1/mmu_rb.c +++ b/drivers/staging/rdma/hfi1/mmu_rb.c @@ -91,7 +91,7 @@ static unsigned long mmu_node_start(struct mmu_rb_node *node) static unsigned long mmu_node_last(struct mmu_rb_node *node) { - return PAGE_ALIGN((node->addr & PAGE_MASK) + node->len) - 1; + return PAGE_ALIGN(node->addr + node->len) - 1; } int hfi1_mmu_rb_register(struct rb_root *root, struct mmu_rb_ops *ops) diff --git a/drivers/staging/rdma/hfi1/user_sdma.c b/drivers/staging/rdma/hfi1/user_sdma.c index 044d33777fba..d1645d98a43d 100644 --- a/drivers/staging/rdma/hfi1/user_sdma.c +++ b/drivers/staging/rdma/hfi1/user_sdma.c @@ -1076,7 +1076,6 @@ static int pin_vector_pages(struct user_sdma_request *req, return -ENOMEM; node->rb.addr = (unsigned long)iovec->iov.iov_base; - node->rb.len = iovec->iov.iov_len; node->pq = pq; atomic_set(&node->refcount, 0); INIT_LIST_HEAD(&node->list); @@ -1117,6 +1116,7 @@ retry: goto bail; } kfree(node->pages); + node->rb.len = iovec->iov.iov_len; node->pages = pages; node->npages += pinned; npages = node->npages;