| From | Mika Westerberg <> | Subject | [PATCH v2 03/27] thunderbolt: Do not try to read UID if DROM offset is read as 0 | Date | Fri, 26 May 2017 19:09:12 +0300 |
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At least Falcon Ridge when in host mode does not have any kind of DROM available and reading DROM offset returns 0 for these. Do not try to read DROM any further in that case.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com> Reviewed-by: Michael Jamet <michael.jamet@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- drivers/thunderbolt/eeprom.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 6392990c984d..e4e64b130514 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -276,6 +276,9 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid) if (res) return res; + if (drom_offset == 0) + return -ENODEV; + /* read uid */ res = tb_eeprom_read_n(sw, drom_offset, data, 9); if (res) -- 2.11.0
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