linux-kernel - [PATCH v1 2/5] pwm: core: Always require PWM flags to be provided

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210531154351.53614-2-andriy.shevchenko@linux.intel.com>
Date:   Mon, 31 May 2021 18:43:48 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Flavio Suligoi <f.suligoi@...m.it>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v1 2/5] pwm: core: Always require PWM flags to be provided

It makes little sense to make PWM flags optional since in case
of multi-channel consumer the flags can be optional only for
the last listed channel. Thus always require PWM flags to be
provided.

Fixes: 4a6ef8e37c4d ("pwm: Add support referencing PWMs from ACPI")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/pwm/core.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index c165c5822703..25f7b3370672 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -852,8 +852,10 @@ static struct pwm_chip *device_to_pwmchip(struct device *dev)
  *
  * This is analogous to of_pwm_get() except con_id is not yet supported.
  * ACPI entries must look like
- * Package () {"pwms", Package ()
- *     { <PWM device reference>, <PWM index>, <PWM period> [, <PWM flags>]}}
+ * Package () { "pwms", Package () {
+ *		<PWM device reference>, <PWM index>, <PWM period>, <PWM flags>,
+ *	}
+ * }
  *
  * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
  * error code on failure.
@@ -877,7 +879,7 @@ static struct pwm_device *acpi_pwm_get(struct fwnode_handle *fwnode)
 	if (!acpi)
 		return ERR_PTR(-EINVAL);
 
-	if (args.nargs < 2)
+	if (args.nargs < 3)
 		return ERR_PTR(-EPROTO);
 
 	chip = device_to_pwmchip(&acpi->dev);
@@ -891,7 +893,7 @@ static struct pwm_device *acpi_pwm_get(struct fwnode_handle *fwnode)
 	pwm->args.period = args.args[1];
 	pwm->args.polarity = PWM_POLARITY_NORMAL;
 
-	if (args.nargs > 2 && args.args[2] & PWM_POLARITY_INVERTED)
+	if (args.args[2] & PWM_POLARITY_INVERTED)
 		pwm->args.polarity = PWM_POLARITY_INVERSED;
 #endif
 
-- 
2.30.2