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| author | melifaro <melifaro@FreeBSD.org> | 2014-09-13 16:04:55 +0000 |
|---|---|---|
| committer | melifaro <melifaro@FreeBSD.org> | 2014-09-13 16:04:55 +0000 |
| commit | cca53e2bbcbf76b919d889efbeb8f2aa1f73980a (patch) | |
| tree | e252cdf5ec68b7d418656a2f55995ccdf36570ea | |
| parent | 0a46d9d7d592cf517c516fad4b2df10863ceeb83 (diff) | |
| download | FreeBSD-src-cca53e2bbcbf76b919d889efbeb8f2aa1f73980a.zip FreeBSD-src-cca53e2bbcbf76b919d889efbeb8f2aa1f73980a.tar.gz | |
Do not try to read i2c info when no transceiver is present.
MFC with: r270064
Sponsored by: Yandex LLC
| -rw-r--r-- | sbin/ifconfig/sfp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sbin/ifconfig/sfp.c b/sbin/ifconfig/sfp.c index 2e8039d..abe71d6 100644 --- a/sbin/ifconfig/sfp.c +++ b/sbin/ifconfig/sfp.c @@ -764,11 +764,13 @@ sfp_status(int s, struct ifreq *ifr, int verbose) /* * Try to read byte 0 from i2c: * Both SFF-8472 and SFF-8436 use it as - * 'identification byte' + * 'identification byte'. + * Stop reading status on zero as value - + * this might happen in case of empty transceiver slot. */ id_byte = 0; ii.f(&ii, SFF_8472_BASE, SFF_8472_ID, 1, (caddr_t)&id_byte); - if (ii.error != 0) + if (ii.error != 0 || id_byte == 0) return; switch (id_byte) { |
