diff options
| author | Allen Hubbe <Allen.Hubbe@emc.com> | 2015-08-31 15:30:59 +0200 |
|---|---|---|
| committer | Jon Mason <jdmason@kudzu.us> | 2015-09-07 21:27:12 +0200 |
| commit | 2aa2a77a489deda473c99a4c15074d092718912c (patch) | |
| tree | 07d9664437561503b5d7386f456f5f960d308f78 | |
| parent | NTB: Fix documentation for ntb_peer_db_clear. (diff) | |
| download | linux-2aa2a77a489deda473c99a4c15074d092718912c.tar.xz linux-2aa2a77a489deda473c99a4c15074d092718912c.zip | |
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>
| -rw-r--r-- | drivers/ntb/hw/intel/ntb_hw_intel.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/ntb/hw/intel/ntb_hw_intel.c b/drivers/ntb/hw/intel/ntb_hw_intel.c index c2bc56b67e63..fc6af2da8df0 100644 --- a/drivers/ntb/hw/intel/ntb_hw_intel.c +++ b/drivers/ntb/hw/intel/ntb_hw_intel.c @@ -575,10 +575,13 @@ static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf, "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 @@ static int xeon_setup_b2b_mw(struct intel_ntb_dev *ndev, 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 @@ static int xeon_init_ntb(struct intel_ntb_dev *ndev) 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 @@ static inline void ndev_init_struct(struct intel_ntb_dev *ndev, ndev->ntb.ops = &intel_ntb_ops; ndev->b2b_off = 0; - ndev->b2b_idx = INT_MAX; + ndev->b2b_idx = UINT_MAX; ndev->bar4_split = 0; |