NTB: Improve index handling in B2B MW workaround
Check that b2b_mw_idx is in range of the number of memory windows when
initializing the device. The workaround is considered to be in effect
only if the device b2b_idx is exactly UINT_MAX, instead of any index
past the last memory window.
Only print B2B MW workaround information in debugfs if the workaround is
in effect.
Signed-off-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
diff --git a/drivers/ntb/hw/intel/ntb_hw_intel.c b/drivers/ntb/hw/intel/ntb_hw_intel.c
index c2bc56b..fc6af2d 100644
--- a/drivers/ntb/hw/intel/ntb_hw_intel.c
+++ b/drivers/ntb/hw/intel/ntb_hw_intel.c
@@ -575,10 +575,13 @@
"Connection Topology -\t%s\n",
ntb_topo_string(ndev->ntb.topo));
- off += scnprintf(buf + off, buf_size - off,
- "B2B Offset -\t\t%#lx\n", ndev->b2b_off);
- off += scnprintf(buf + off, buf_size - off,
- "B2B MW Idx -\t\t%d\n", ndev->b2b_idx);
+ if (ndev->b2b_idx != UINT_MAX) {
+ off += scnprintf(buf + off, buf_size - off,
+ "B2B MW Idx -\t\t%u\n", ndev->b2b_idx);
+ off += scnprintf(buf + off, buf_size - off,
+ "B2B Offset -\t\t%#lx\n", ndev->b2b_off);
+ }
+
off += scnprintf(buf + off, buf_size - off,
"BAR4 Split -\t\t%s\n",
ndev->bar4_split ? "yes" : "no");
@@ -1487,7 +1490,7 @@
pdev = ndev_pdev(ndev);
mmio = ndev->self_mmio;
- if (ndev->b2b_idx >= ndev->mw_count) {
+ if (ndev->b2b_idx == UINT_MAX) {
dev_dbg(ndev_dev(ndev), "not using b2b mw\n");
b2b_bar = 0;
ndev->b2b_off = 0;
@@ -1779,6 +1782,13 @@
else
ndev->b2b_idx = b2b_mw_idx;
+ if (ndev->b2b_idx >= ndev->mw_count) {
+ dev_dbg(ndev_dev(ndev),
+ "b2b_mw_idx %d invalid for mw_count %u\n",
+ b2b_mw_idx, ndev->mw_count);
+ return -EINVAL;
+ }
+
dev_dbg(ndev_dev(ndev),
"setting up b2b mw idx %d means %d\n",
b2b_mw_idx, ndev->b2b_idx);
@@ -2008,7 +2018,7 @@
ndev->ntb.ops = &intel_ntb_ops;
ndev->b2b_off = 0;
- ndev->b2b_idx = INT_MAX;
+ ndev->b2b_idx = UINT_MAX;
ndev->bar4_split = 0;