linux-kernel - [PATCH v2 10/27] thunderbolt: Fail switch adding operation if reading DROM fails

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Date:   Fri, 26 May 2017 19:09:19 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>, Mario.Limonciello@...l.com,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 10/27] thunderbolt: Fail switch adding operation if reading DROM fails

All non-root switches are expected to have DROM so if the operation
fails, it might be due the user unlugging the device. There is no point
continuing adding the switch further in that case. Just bail out.

For root switches (hosts) the DROM is either retrieved from a EFI
variable, NVM or hard-coded.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@...el.com>
Reviewed-by: Michael Jamet <michael.jamet@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/thunderbolt/switch.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 8b7ac592866a..86ebce28e257 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -533,8 +533,11 @@ int tb_switch_add(struct tb_switch *sw)
 	int i, ret;
 
 	/* read drom */
-	if (tb_drom_read(sw))
-		tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n");
+	ret = tb_drom_read(sw);
+	if (ret) {
+		tb_sw_warn(sw, "tb_eeprom_read_rom failed\n");
+		return ret;
+	}
 	tb_sw_info(sw, "uid: %#llx\n", sw->uid);
 
 	tb_switch_set_uuid(sw);
-- 
2.11.0