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author | Ivo Borisov Shopov <ivoshopov@gmail.com> | 2023-01-26 14:10:33 +0100 |
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committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-01-27 14:05:46 +0100 |
commit | 677d85e1a1ee69fa05ccea83847309484be3781c (patch) | |
tree | 562b269eed424d502cc1c51f1cac00a1f32ed97f /tools/gpio | |
parent | gpio: ep93xx: remove unused variable (diff) | |
download | linux-677d85e1a1ee69fa05ccea83847309484be3781c.tar.xz linux-677d85e1a1ee69fa05ccea83847309484be3781c.zip |
tools: gpio: fix -c option of gpio-event-mon
Following line should listen for a rising edge and exit after the first
one since '-c 1' is provided.
# gpio-event-mon -n gpiochip1 -o 0 -r -c 1
It works with kernel 4.19 but it doesn't work with 5.10. In 5.10 the
above command doesn't exit after the first rising edge it keep listening
for an event forever. The '-c 1' is not taken into an account.
The problem is in commit 62757c32d5db ("tools: gpio: add multi-line
monitoring to gpio-event-mon").
Before this commit the iterator 'i' in monitor_device() is used for
counting of the events (loops). In the case of the above command (-c 1)
we should start from 0 and increment 'i' only ones and hit the 'break'
statement and exit the process. But after the above commit counting
doesn't start from 0, it start from 1 when we listen on one line.
It is because 'i' is used from one more purpose, counting of lines
(num_lines) and it isn't restore to 0 after following code
for (i = 0; i < num_lines; i++)
gpiotools_set_bit(&values.mask, i);
Restore the initial value of the iterator to 0 in order to allow counting
of loops to work for any cases.
Fixes: 62757c32d5db ("tools: gpio: add multi-line monitoring to gpio-event-mon")
Signed-off-by: Ivo Borisov Shopov <ivoshopov@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[Bartosz: tweak the commit message]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'tools/gpio')
-rw-r--r-- | tools/gpio/gpio-event-mon.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c index 6c122952c589..5dee2b98ab60 100644 --- a/tools/gpio/gpio-event-mon.c +++ b/tools/gpio/gpio-event-mon.c @@ -86,6 +86,7 @@ int monitor_device(const char *device_name, gpiotools_test_bit(values.bits, i)); } + i = 0; while (1) { struct gpio_v2_line_event event; |