From: Bryan Rosenburg Date: Wed, 20 Feb 2008 23:31:48 +0000 (-0600) Subject: RDMA/cxgb3: Fix shift calc in build_phys_page_list() for 1-entry page lists X-Git-Tag: v2.6.25-rc4~150^2~9 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82d416fffb5e8e39e899be7075dbeeac5fb8f0c2;p=linux-2.6 RDMA/cxgb3: Fix shift calc in build_phys_page_list() for 1-entry page lists A single entry (addr 0x10001000, size 0x2000) will get converted to page address 0x10000000 with a page size of 0x4000. The code as it stands doesn't address the single buffer case, but in fact it allows the subsequent single-buffer special case to be eliminated entirely. Because the mask now includes the (page adjusted) starting and ending addresses, the general case works for the single buffer case as well. Signed-off-by: Bryan Rosenburg Acked-by: Steve Wise Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/cxgb3/iwch_mem.c b/drivers/infiniband/hw/cxgb3/iwch_mem.c index 73bfd1656f..b8797c6667 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_mem.c +++ b/drivers/infiniband/hw/cxgb3/iwch_mem.c @@ -136,14 +136,8 @@ int build_phys_page_list(struct ib_phys_buf *buffer_list, /* Find largest page shift we can use to cover buffers */ for (*shift = PAGE_SHIFT; *shift < 27; ++(*shift)) - if (num_phys_buf > 1) { - if ((1ULL << *shift) & mask) - break; - } else - if (1ULL << *shift >= - buffer_list[0].size + - (buffer_list[0].addr & ((1ULL << *shift) - 1))) - break; + if ((1ULL << *shift) & mask) + break; buffer_list[0].size += buffer_list[0].addr & ((1ULL << *shift) - 1); buffer_list[0].addr &= ~0ull << *shift;