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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2021-07-07 18:27:50 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2021-09-02 21:38:36 +0200 |
| commit | 020162d6f49f2963062229814a56a89c86cbeaa8 (patch) | |
| tree | ff818e000d85d764237bc3c705ca38179696e4a6 /drivers/pwm/pwm-img.c | |
| parent | pwm: lpc32xx: Don't modify HW state in .probe() after the PWM chip was regist... (diff) | |
| download | linux-020162d6f49f2963062229814a56a89c86cbeaa8.tar.gz linux-020162d6f49f2963062229814a56a89c86cbeaa8.zip | |
pwm: mxs: Don't modify HW state in .probe() after the PWM chip was registered
This fixes a race condition: After pwmchip_add() is called there might
already be a consumer and then modifying the hardware behind the
consumer's back is bad. So reset before calling pwmchip_add().
Note that reseting the hardware isn't the right thing to do if the PWM
is already running as it might e.g. disable (or even enable) a backlight
that is supposed to be on (or off).
Fixes: 4dce82c1e840 ("pwm: add pwm-mxs support")
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-img.c')
0 files changed, 0 insertions, 0 deletions