[2/8] pwm: core: Add support to remove registered consumer lookup tables
diff mbox

Message ID 1430818458-26922-1-git-send-email-shobhit.kumar@intel.com
State New
Headers show

Commit Message

Kumar, Shobhit May 5, 2015, 9:34 a.m. UTC
In case some drivers are unloading, they can remove lookup tables which
they would have registered during their load time to avoid redundant
entries if loaded again

v2: Ccing maintainers
v3: Correct the subject line (Lee jones)

CC: Samuel Ortiz <sameo@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/pwm/core.c  | 17 +++++++++++++++++
 include/linux/pwm.h |  5 +++++
 2 files changed, 22 insertions(+)

Comments

Thierry Reding May 6, 2015, 12:21 p.m. UTC | #1
On Tue, May 05, 2015 at 03:04:18PM +0530, Shobhit Kumar wrote:
> In case some drivers are unloading, they can remove lookup tables which
> they would have registered during their load time to avoid redundant
> entries if loaded again
> 
> v2: Ccing maintainers
> v3: Correct the subject line (Lee jones)
> 
> CC: Samuel Ortiz <sameo@linux.intel.com>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Alexandre Courbot <gnurou@gmail.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
> ---
>  drivers/pwm/core.c  | 17 +++++++++++++++++
>  include/linux/pwm.h |  5 +++++
>  2 files changed, 22 insertions(+)

Applied, thanks.

Thierry

Patch
diff mbox

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index ba34c7d..d2fe7c8d 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -586,6 +586,23 @@  void pwm_add_table(struct pwm_lookup *table, size_t num)
 }
 
 /**
+ * pwm_remove_table() - un-register PWM device consumers
+ * @table: array of consumers to un-register
+ * @num: number of consumers in table
+ */
+void pwm_remove_table(struct pwm_lookup *table, size_t num)
+{
+	mutex_lock(&pwm_lookup_lock);
+
+	while (num--) {
+		list_del(&table->list);
+		table++;
+	}
+
+	mutex_unlock(&pwm_lookup_lock);
+}
+
+/**
  * pwm_get() - look up and request a PWM device
  * @dev: device for PWM consumer
  * @con_id: consumer name
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e90628c..cfe2d8d 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -290,10 +290,15 @@  struct pwm_lookup {
 
 #if IS_ENABLED(CONFIG_PWM)
 void pwm_add_table(struct pwm_lookup *table, size_t num);
+void pwm_remove_table(struct pwm_lookup *table, size_t num);
 #else
 static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
 {
 }
+
+static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
+{
+}
 #endif
 
 #ifdef CONFIG_PWM_SYSFS