linux-kernel - [PATCH v1 1/2] selftests: gpio: gpio-sim: Fix BUG: test FAILED due to recent change

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Message-Id: <20230411171521.29678-1-andriy.shevchenko@linux.intel.com>
Date:   Tue, 11 Apr 2023 20:15:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     linux-gpio@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Bamvor Jian Zhang <bamv2005@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/2] selftests: gpio: gpio-sim: Fix BUG: test FAILED due to recent change

From: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>

According to Mirsad the gpio-sim.sh test appears to FAIL in a wrong way
due to missing initialisation of shell variables:

 4.2. Bias settings work correctly
 cat: /sys/devices/platform/gpio-sim.0/gpiochip18/sim_gpio0/value: No such file or directory
 ./gpio-sim.sh: line 393: test: =: unary operator expected
 bias setting does not work
 GPIO gpio-sim test FAIL

After this change the test passed:

 4.2. Bias settings work correctly
 GPIO gpio-sim test PASS

His testing environment is AlmaLinux 8.7 on Lenovo desktop box with
the latest Linux kernel based on v6.2:

  Linux 6.2.0-mglru-kmlk-andy-09238-gd2980d8d8265 x86_64

Suggested-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 tools/testing/selftests/gpio/gpio-sim.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/gpio/gpio-sim.sh b/tools/testing/selftests/gpio/gpio-sim.sh
index 9f539d454ee4..fa2ce2b9dd5f 100755
--- a/tools/testing/selftests/gpio/gpio-sim.sh
+++ b/tools/testing/selftests/gpio/gpio-sim.sh
@@ -389,6 +389,9 @@ create_chip chip
 create_bank chip bank
 set_num_lines chip bank 8
 enable_chip chip
+DEVNAME=`configfs_dev_name chip`
+CHIPNAME=`configfs_chip_name chip bank`
+SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value"
 $BASE_DIR/gpio-mockup-cdev -b pull-up /dev/`configfs_chip_name chip bank` 0
 test `cat $SYSFS_PATH` = "1" || fail "bias setting does not work"
 remove_chip chip
-- 
2.40.0.1.gaa8946217a0b