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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-06-06 15:24:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-09 12:42:41 +0300
commitdf1421b5f72979e48096f68c253f59aa7e8e7468 (patch)
tree5a456484095181ef3a2cb3bb0152b377fa707200 /drivers/thunderbolt/eeprom.c
parent08a5e4cebec543bfa4a6d119fc18f0ed8fd9d8ce (diff)
downloadlinux-df1421b5f72979e48096f68c253f59aa7e8e7468.tar.xz
thunderbolt: Do not try to read UID if DROM offset is read as 0
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> Signed-off-by: Andreas Noever <andreas.noever@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/eeprom.c')
-rw-r--r--drivers/thunderbolt/eeprom.c3
1 files changed, 3 insertions, 0 deletions
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)