| 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
| ||
|
Message-ID: <1433970069-30235-1-git-send-email-grygorii.strashko@ti.com>
Date: Thu, 11 Jun 2015 00:01:09 +0300
From: Grygorii Strashko <grygorii.strashko@...com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>
CC: Sekhar Nori <nsekhar@...com>, <linux-gpio@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Grygorii Strashko <grygorii.strashko@...com>,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2] gpio: pcf857x: handle only enabled irqs
Now pcf857x_irq() IRQ's dispatcher will try to run nested
IRQ handlers for each GPIO pin which state has changed.
Such IRQs are, actually, spurious and nested IRQ handlers
have to be called only for IRQs wich were enabled by users.
This is not critical issue - just /proc/interrupts
will display counters for unused IRQS:
399: 4 0 pcf857x 0 Edge
428: 1 0 pcf857x 13 Edge
430: 1 0 pcf857x 15 Edge
Hence, fix it by adding irq_enabled field in struct pcf857x to track
enabled GPIO IRQs and corresponding callbacks in pcf857x_irq_chip.
Similar functionality was presented in pcf857x driver, commit
21fd3cd1874a ('gpio: pcf857x: call the gpio user handler iff...')
and then it was removed by commit
a39294bdf4b0 ('gpio: pcf857x: Switch to use gpiolib irqchip...')
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Fixes: a39294bdf4b0 ('gpio: pcf857x: Switch to use gpiolib irqchip helpers')
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
No functional changes.
It's just rebased on top of "devel" branch
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
drivers/gpio/gpio-pcf857x.c | 46 ++++++++++++++++++++++++++++++++++-----------
1 file changed, 35 insertions(+), 11 deletions(-)
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 83db0e1..404f3c6 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -92,6 +92,7 @@ struct pcf857x {
unsigned out; /* software latch */
unsigned status; /* current status */
unsigned int irq_parent;
+ unsigned irq_enabled; /* enabled irqs */
int (*write)(struct i2c_client *client, unsigned data);
int (*read)(struct i2c_client *client);
@@ -195,7 +196,7 @@ static irqreturn_t pcf857x_irq(int irq, void *data)
* interrupt source, just to avoid bad irqs
*/
- change = (gpio->status ^ status);
+ change = (gpio->status ^ status) & gpio->irq_enabled;
for_each_set_bit(i, &change, gpio->chip.ngpio)
handle_nested_irq(irq_find_mapping(gpio->chip.irqdomain, i));
gpio->status = status;
@@ -210,14 +211,10 @@ static irqreturn_t pcf857x_irq(int irq, void *data)
*/
static void noop(struct irq_data *data) { }
-static unsigned int noop_ret(struct irq_data *data)
-{
- return 0;
-}
-
static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on)
{
struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
int error = 0;
if (gpio->irq_parent) {
@@ -229,20 +226,47 @@ static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on)
gpio->irq_parent = 0;
}
}
-
return error;
}
+static void pcf857x_irq_enable(struct irq_data *data)
+{
+ struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+ gpio->irq_enabled |= (1 << data->hwirq);
+}
+
+static void pcf857x_irq_disable(struct irq_data *data)
+{
+ struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+ gpio->irq_enabled &= ~(1 << data->hwirq);
+}
+
+static void pcf857x_irq_bus_lock(struct irq_data *data)
+{
+ struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&gpio->lock);
+}
+
+static void pcf857x_irq_bus_sync_unlock(struct irq_data *data)
+{
+ struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+ mutex_unlock(&gpio->lock);
+}
+
static struct irq_chip pcf857x_irq_chip = {
.name = "pcf857x",
- .irq_startup = noop_ret,
- .irq_shutdown = noop,
- .irq_enable = noop,
- .irq_disable = noop,
+ .irq_enable = pcf857x_irq_enable,
+ .irq_disable = pcf857x_irq_disable,
.irq_ack = noop,
.irq_mask = noop,
.irq_unmask = noop,
.irq_set_wake = pcf857x_irq_set_wake,
+ .irq_bus_lock = pcf857x_irq_bus_lock,
+ .irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock,
};
/*-------------------------------------------------------------------------*/
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists