From: Fabrice Gasnier <fabrice.gasnier@st.com>
To: <thierry.reding@gmail.com>, <stefan.wahren@i2se.com>,
<gohai@sukzessiv.net>
Cc: <hsweeten@visionengravers.com>, <gottfried.haider@gmail.com>,
<loic.pallardy@st.com>, <broonie@kernel.org>,
<fabrice.gasnier@st.com>, <linux-arm-kernel@lists.infradead.org>,
<linux-rpi-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-pwm@vger.kernel.org>
Subject: [RESEND PATCH] Revert "pwm: Set class for exported channels in sysfs"
Date: Fri, 21 Sep 2018 16:02:47 +0200 [thread overview]
Message-ID: <1537538567-5377-1-git-send-email-fabrice.gasnier@st.com> (raw)
This reverts commit 7e5d1fd75c3dde9fc10c4472b9368089d1b81d00 as it causes
regression with multiple pwm chip. It creates a new entry in
'/sys/class/pwm' every time a 'pwmX' is exported with 'echo X > export':
- 1st time export will create an entry in /sys/class/pwm/pwmX
- when another export happens on another pwmchip, it can't be created
(e.g. -EEXIST)
This also changes existing ABI (Documentation/ABI/testing/sysfs-class-pwm):
- pmwX should be there: /sys/class/pwm/pwmchipN/pwmX
Example on stm32 (stm32429i-eval) platform:
$ ls /sys/class/pwm
pwmchip0 pwmchip4
$ cd /sys/class/pwm/pwmchip0/
$ echo 0 > export
$ ls /sys/class/pwm
pwm0 pwmchip0 pwmchip4
$ cd /sys/class/pwm/pwmchip4/
$ echo 0 > export
sysfs: cannot create duplicate filename '/class/pwm/pwm0'
...Exception stack follows...
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/pwm/sysfs.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 7c71cdb..4726d43 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -263,7 +263,6 @@ static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
export->pwm = pwm;
mutex_init(&export->lock);
- export->child.class = parent->class;
export->child.release = pwm_export_release;
export->child.parent = parent;
export->child.devt = MKDEV(0, 0);
--
1.9.1
next reply other threads:[~2018-09-21 14:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 14:02 Fabrice Gasnier [this message]
2018-09-24 11:53 ` [RESEND PATCH] Revert "pwm: Set class for exported channels in sysfs" Thierry Reding
2018-09-24 13:59 ` Fabrice Gasnier
2018-09-24 14:23 ` Thierry Reding
2018-09-24 15:50 ` Fabrice Gasnier
2018-09-25 13:59 ` Fabrice Gasnier
2018-09-25 15:20 ` Thierry Reding
2018-09-29 0:19 ` Gottfried Haider
2018-10-01 13:28 ` Fabrice Gasnier
-- strict thread matches above, loose matches on Subject: below --
2018-07-20 7:27 Fabrice Gasnier
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