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| author | Logan Gunthorpe <logang@deltatee.com> | 2017-06-05 20:00:53 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-30 08:21:54 (GMT) |
| commit | 471954c313c57e09839f1381bd4897283d8e6537 (patch) | |
| tree | 5ee9e8960771ca7294a4a49411a308be68e663df /init/noinitramfs.c | |
| parent | 4743d1b37a38c36ce2b01741edd33bbaaea9a1b4 (diff) | |
| download | linux-471954c313c57e09839f1381bd4897283d8e6537.tar.xz | |
ntb_transport: fix bug calculating num_qps_mw
commit 8e8496e0e9564b66165f5219a4e8ed20b0d3fc6b upstream.
A divide by zero error occurs if qp_count is less than mw_count because
num_qps_mw is calculated to be zero. The calculation appears to be
incorrect.
The requirement is for num_qps_mw to be set to qp_count / mw_count
with any remainder divided among the earlier mws.
For example, if mw_count is 5 and qp_count is 12 then mws 0 and 1
will have 3 qps per window and mws 2 through 4 will have 2 qps per window.
Thus, when mw_num < qp_count % mw_count, num_qps_mw is 1 higher
than when mw_num >= qp_count.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Fixes: e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers")
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init/noinitramfs.c')
0 files changed, 0 insertions, 0 deletions