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devinfo sysctl handler: Do not write zero-length strings in to sbuf twice

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This fixes missing PnPinfo and location strings in devinfo(8) output
for devices with no attached drivers.
This commit is contained in:
Vladimir Kondratyev 2021-01-21 02:06:16 +03:00
parent e54a1d5751
commit e3dd8ed77b
1 changed files with 0 additions and 6 deletions
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6
sys/kern/subr_bus.c
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@ -5528,18 +5528,12 @@ sysctl_devices(SYSCTL_HANDLER_ARGS)
sbuf_new(&sb, udev->dv_fields, sizeof(udev->dv_fields), SBUF_FIXEDLEN);
if (dev->nameunit != NULL)
sbuf_cat(&sb, dev->nameunit);
else
sbuf_putc(&sb, '\0');
sbuf_putc(&sb, '\0');
if (dev->desc != NULL)
sbuf_cat(&sb, dev->desc);
else
sbuf_putc(&sb, '\0');
sbuf_putc(&sb, '\0');
if (dev->driver != NULL)
sbuf_cat(&sb, dev->driver->name);
else
sbuf_putc(&sb, '\0');
sbuf_putc(&sb, '\0');
bus_child_pnpinfo_sb(dev, &sb);
sbuf_putc(&sb, '\0');