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IB/ehca: Fix clipping of device limits to INT_MAX

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Doing min_t(int, foo, INT_MAX) doesn't work correctly, because if foo
is bigger than INT_MAX, then when treated as a signed integer, it will
become negative and hence such an expression is just an elaborate NOP.

Fix such cases in ehca to do min_t(unsigned, foo, INT_MAX) instead.
This fixes negative reported values for max_cqe, max_pd and max_ah:

Before:

        max_cqe:                        -64
        max_pd:                         -1
        max_ah:                         -1

After:
        max_cqe:                        2147483647
        max_pd:                         2147483647
        max_ah:                         2147483647

Based on a bug report and fix from Anton Blanchard <anton@samba.org>.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2007-10-09 19:59:18 -07:00
parent ede6bc04f3
commit 76dea3bc26
1 changed files with 16 additions and 16 deletions
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32
drivers/infiniband/hw/ehca/ehca_hca.c
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@ -82,17 +82,17 @@ int ehca_query_device(struct ib_device *ibdev, struct ib_device_attr *props)
props->vendor_id = rblock->vendor_id >> 8;
props->vendor_part_id = rblock->vendor_part_id >> 16;
props->hw_ver = rblock->hw_ver;
props->max_qp = min_t(int, rblock->max_qp, INT_MAX);
props->max_qp_wr = min_t(int, rblock->max_wqes_wq, INT_MAX);
props->max_sge = min_t(int, rblock->max_sge, INT_MAX);
props->max_sge_rd = min_t(int, rblock->max_sge_rd, INT_MAX);
props->max_cq = min_t(int, rblock->max_cq, INT_MAX);
props->max_cqe = min_t(int, rblock->max_cqe, INT_MAX);
props->max_mr = min_t(int, rblock->max_mr, INT_MAX);
props->max_mw = min_t(int, rblock->max_mw, INT_MAX);
props->max_pd = min_t(int, rblock->max_pd, INT_MAX);
props->max_ah = min_t(int, rblock->max_ah, INT_MAX);
props->max_fmr = min_t(int, rblock->max_mr, INT_MAX);
props->max_qp = min_t(unsigned, rblock->max_qp, INT_MAX);
props->max_qp_wr = min_t(unsigned, rblock->max_wqes_wq, INT_MAX);
props->max_sge = min_t(unsigned, rblock->max_sge, INT_MAX);
props->max_sge_rd = min_t(unsigned, rblock->max_sge_rd, INT_MAX);
props->max_cq = min_t(unsigned, rblock->max_cq, INT_MAX);
props->max_cqe = min_t(unsigned, rblock->max_cqe, INT_MAX);
props->max_mr = min_t(unsigned, rblock->max_mr, INT_MAX);
props->max_mw = min_t(unsigned, rblock->max_mw, INT_MAX);
props->max_pd = min_t(unsigned, rblock->max_pd, INT_MAX);
props->max_ah = min_t(unsigned, rblock->max_ah, INT_MAX);
props->max_fmr = min_t(unsigned, rblock->max_mr, INT_MAX);
if (EHCA_BMASK_GET(HCA_CAP_SRQ, shca->hca_cap)) {
props->max_srq = props->max_qp;
@ -104,15 +104,15 @@ int ehca_query_device(struct ib_device *ibdev, struct ib_device_attr *props)
props->local_ca_ack_delay
= rblock->local_ca_ack_delay;
props->max_raw_ipv6_qp
= min_t(int, rblock->max_raw_ipv6_qp, INT_MAX);
= min_t(unsigned, rblock->max_raw_ipv6_qp, INT_MAX);
props->max_raw_ethy_qp
= min_t(int, rblock->max_raw_ethy_qp, INT_MAX);
= min_t(unsigned, rblock->max_raw_ethy_qp, INT_MAX);
props->max_mcast_grp
= min_t(int, rblock->max_mcast_grp, INT_MAX);
= min_t(unsigned, rblock->max_mcast_grp, INT_MAX);
props->max_mcast_qp_attach
= min_t(int, rblock->max_mcast_qp_attach, INT_MAX);
= min_t(unsigned, rblock->max_mcast_qp_attach, INT_MAX);
props->max_total_mcast_qp_attach
= min_t(int, rblock->max_total_mcast_qp_attach, INT_MAX);
= min_t(unsigned, rblock->max_total_mcast_qp_attach, INT_MAX);
/* translate device capabilities */
props->device_cap_flags = IB_DEVICE_SYS_IMAGE_GUID |