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-rw-r--r--sys/kern/subr_disk.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/kern/subr_disk.c b/sys/kern/subr_disk.c
index 8e637ff..ce5f6e0 100644
--- a/sys/kern/subr_disk.c
+++ b/sys/kern/subr_disk.c
@@ -48,6 +48,8 @@ disk_dev_synth(dev_t dev)
p = RAW_PART;
s = WHOLE_DISK_SLICE;
pdev = makedev(dp->d_devsw->d_maj, dkmakeminor(u, s, p));
+ if (pdev->si_devsw == NULL)
+ return; /* Probably a unit we don't have */
s = dkslice(dev);
p = dkpart(dev);
if (s == WHOLE_DISK_SLICE && p == RAW_PART) {
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