* [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection
@ 2012-07-29 2:54 Axel Lin
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Axel Lin @ 2012-07-29 2:54 UTC (permalink / raw)
To: linux-kernel; +Cc: Feng Tang, Tomoya MORINAGA, Grant Likely, Linus Walleij
gpio_chip.can_sleep is 0, but current code uses mutex in ioh_gpio_set,
ioh_gpio_get and ioh_gpio_direction_input functions.
Thus those functions are not callable from interrupt context.
This patch converts mutex into spinlock.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
drivers/gpio/gpio-ml-ioh.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/gpio/gpio-ml-ioh.c b/drivers/gpio/gpio-ml-ioh.c
index db01f15..6a29ee1 100644
--- a/drivers/gpio/gpio-ml-ioh.c
+++ b/drivers/gpio/gpio-ml-ioh.c
@@ -87,8 +87,7 @@ struct ioh_gpio_reg_data {
* @gpio_use_sel: Save GPIO_USE_SEL1~4 register for PM
* @ch: Indicate GPIO channel
* @irq_base: Save base of IRQ number for interrupt
- * @spinlock: Used for register access protection in
- * interrupt context ioh_irq_type and PM;
+ * @spinlock: Used for register access protection
*/
struct ioh_gpio {
void __iomem *base;
@@ -97,7 +96,6 @@ struct ioh_gpio {
struct gpio_chip gpio;
struct ioh_gpio_reg_data ioh_gpio_reg;
u32 gpio_use_sel;
- struct mutex lock;
int ch;
int irq_base;
spinlock_t spinlock;
@@ -109,8 +107,9 @@ static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
u32 reg_val;
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
reg_val = ioread32(&chip->reg->regs[chip->ch].po);
if (val)
reg_val |= (1 << nr);
@@ -118,7 +117,7 @@ static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
}
static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
@@ -134,8 +133,9 @@ static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
u32 pm;
u32 reg_val;
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
((1 << num_ports[chip->ch]) - 1);
pm |= (1 << nr);
@@ -148,7 +148,7 @@ static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
@@ -157,13 +157,14 @@ static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
u32 pm;
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
((1 << num_ports[chip->ch]) - 1);
pm &= ~(1 << nr);
iowrite32(pm, &chip->reg->regs[chip->ch].pm);
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
@@ -447,7 +448,6 @@ static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
chip->base = base;
chip->reg = chip->base;
chip->ch = i;
- mutex_init(&chip->lock);
spin_lock_init(&chip->spinlock);
ioh_gpio_setup(chip, num_ports[i]);
ret = gpiochip_add(&chip->gpio);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH RFT 2/2] gpio: gpio-pch: Use spinlock for register access protection
2012-07-29 2:54 [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection Axel Lin
@ 2012-07-29 2:55 ` Axel Lin
2012-08-13 12:02 ` Linus Walleij
2012-08-14 22:20 ` Linus Walleij
2012-08-13 12:01 ` [PATCH RFT 1/2] gpio: gpio-ml-ioh: " Linus Walleij
2012-08-14 22:18 ` Linus Walleij
2 siblings, 2 replies; 7+ messages in thread
From: Axel Lin @ 2012-07-29 2:55 UTC (permalink / raw)
To: linux-kernel; +Cc: Feng Tang, Tomoya MORINAGA, Grant Likely, Linus Walleij
gpio_chip.can_sleep is 0, but current code uses mutex in pch_gpio_set
pch_gpio_get and pch_gpio_direction_input functions.
Thus those functions are not callable from interrupt context.
This patch converts mutex into spinlock.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
drivers/gpio/gpio-pch.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index 139ad3e..4ad0c4f 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -92,9 +92,7 @@ struct pch_gpio_reg_data {
* @lock: Used for register access protection
* @irq_base: Save base of IRQ number for interrupt
* @ioh: IOH ID
- * @spinlock: Used for register access protection in
- * interrupt context pch_irq_mask,
- * pch_irq_unmask and pch_irq_type;
+ * @spinlock: Used for register access protection
*/
struct pch_gpio {
void __iomem *base;
@@ -102,7 +100,6 @@ struct pch_gpio {
struct device *dev;
struct gpio_chip gpio;
struct pch_gpio_reg_data pch_gpio_reg;
- struct mutex lock;
int irq_base;
enum pch_type_t ioh;
spinlock_t spinlock;
@@ -112,8 +109,9 @@ static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
u32 reg_val;
struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
reg_val = ioread32(&chip->reg->po);
if (val)
reg_val |= (1 << nr);
@@ -121,7 +119,7 @@ static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->po);
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
}
static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
@@ -137,8 +135,9 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
u32 pm;
u32 reg_val;
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
pm |= (1 << nr);
iowrite32(pm, &chip->reg->pm);
@@ -149,8 +148,7 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
else
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->po);
-
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
@@ -159,12 +157,13 @@ static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
u32 pm;
+ unsigned long flags;
- mutex_lock(&chip->lock);
+ spin_lock_irqsave(&chip->spinlock, flags);
pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
pm &= ~(1 << nr);
iowrite32(pm, &chip->reg->pm);
- mutex_unlock(&chip->lock);
+ spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
@@ -387,7 +386,6 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev,
chip->reg = chip->base;
pci_set_drvdata(pdev, chip);
- mutex_init(&chip->lock);
spin_lock_init(&chip->spinlock);
pch_gpio_setup(chip);
ret = gpiochip_add(&chip->gpio);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection
2012-07-29 2:54 [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection Axel Lin
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
@ 2012-08-13 12:01 ` Linus Walleij
2012-08-14 1:25 ` Feng Tang
2012-08-14 22:18 ` Linus Walleij
2 siblings, 1 reply; 7+ messages in thread
From: Linus Walleij @ 2012-08-13 12:01 UTC (permalink / raw)
To: Feng Tang, Tomoya MORINAGA; +Cc: linux-kernel, Grant Likely, Axel Lin
On Sun, Jul 29, 2012 at 4:54 AM, Axel Lin <axel.lin@gmail.com> wrote:
> gpio_chip.can_sleep is 0, but current code uses mutex in ioh_gpio_set,
> ioh_gpio_get and ioh_gpio_direction_input functions.
> Thus those functions are not callable from interrupt context.
> This patch converts mutex into spinlock.
>
> Signed-off-by: Axel Lin <axel.lin@gmail.com>
So IOH guys what are you saying about this?
If you say nothing I will apply these patches.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH RFT 2/2] gpio: gpio-pch: Use spinlock for register access protection
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
@ 2012-08-13 12:02 ` Linus Walleij
2012-08-14 22:20 ` Linus Walleij
1 sibling, 0 replies; 7+ messages in thread
From: Linus Walleij @ 2012-08-13 12:02 UTC (permalink / raw)
To: Feng Tang, Tomoya MORINAGA; +Cc: linux-kernel, Grant Likely, Axel Lin
On Sun, Jul 29, 2012 at 4:55 AM, Axel Lin <axel.lin@gmail.com> wrote:
> gpio_chip.can_sleep is 0, but current code uses mutex in pch_gpio_set
> pch_gpio_get and pch_gpio_direction_input functions.
> Thus those functions are not callable from interrupt context.
> This patch converts mutex into spinlock.
>
> Signed-off-by: Axel Lin <axel.lin@gmail.com>
Same with this, yell or I'll apply.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection
2012-08-13 12:01 ` [PATCH RFT 1/2] gpio: gpio-ml-ioh: " Linus Walleij
@ 2012-08-14 1:25 ` Feng Tang
0 siblings, 0 replies; 7+ messages in thread
From: Feng Tang @ 2012-08-14 1:25 UTC (permalink / raw)
To: Linus Walleij; +Cc: Tomoya MORINAGA, linux-kernel, Grant Likely, Axel Lin
On Mon, 13 Aug 2012 14:01:31 +0200
Linus Walleij <linus.walleij@linaro.org> wrote:
> On Sun, Jul 29, 2012 at 4:54 AM, Axel Lin <axel.lin@gmail.com> wrote:
>
> > gpio_chip.can_sleep is 0, but current code uses mutex in ioh_gpio_set,
> > ioh_gpio_get and ioh_gpio_direction_input functions.
> > Thus those functions are not callable from interrupt context.
> > This patch converts mutex into spinlock.
> >
> > Signed-off-by: Axel Lin <axel.lin@gmail.com>
>
> So IOH guys what are you saying about this?
I'm not the IOH guy, but just happened to work on it for some time :) Anyway,
the 2 patches both look good to me.
Thanks,
Feng
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection
2012-07-29 2:54 [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection Axel Lin
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
2012-08-13 12:01 ` [PATCH RFT 1/2] gpio: gpio-ml-ioh: " Linus Walleij
@ 2012-08-14 22:18 ` Linus Walleij
2 siblings, 0 replies; 7+ messages in thread
From: Linus Walleij @ 2012-08-14 22:18 UTC (permalink / raw)
To: Axel Lin; +Cc: linux-kernel, Feng Tang, Tomoya MORINAGA, Grant Likely
On Sun, Jul 29, 2012 at 4:54 AM, Axel Lin <axel.lin@gmail.com> wrote:
> gpio_chip.can_sleep is 0, but current code uses mutex in ioh_gpio_set,
> ioh_gpio_get and ioh_gpio_direction_input functions.
> Thus those functions are not callable from interrupt context.
> This patch converts mutex into spinlock.
>
> Signed-off-by: Axel Lin <axel.lin@gmail.com>
Applied to my devel branch for the next merge window, it doesn't
seem like a regression to me atleast.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH RFT 2/2] gpio: gpio-pch: Use spinlock for register access protection
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
2012-08-13 12:02 ` Linus Walleij
@ 2012-08-14 22:20 ` Linus Walleij
1 sibling, 0 replies; 7+ messages in thread
From: Linus Walleij @ 2012-08-14 22:20 UTC (permalink / raw)
To: Axel Lin; +Cc: linux-kernel, Feng Tang, Tomoya MORINAGA, Grant Likely
On Sun, Jul 29, 2012 at 4:55 AM, Axel Lin <axel.lin@gmail.com> wrote:
> gpio_chip.can_sleep is 0, but current code uses mutex in pch_gpio_set
> pch_gpio_get and pch_gpio_direction_input functions.
> Thus those functions are not callable from interrupt context.
> This patch converts mutex into spinlock.
>
> Signed-off-by: Axel Lin <axel.lin@gmail.com>
Applied to my devel branch for the next merge window...
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-08-14 22:20 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2012-07-29 2:54 [PATCH RFT 1/2] gpio: gpio-ml-ioh: Use spinlock for register access protection Axel Lin
2012-07-29 2:55 ` [PATCH RFT 2/2] gpio: gpio-pch: " Axel Lin
2012-08-13 12:02 ` Linus Walleij
2012-08-14 22:20 ` Linus Walleij
2012-08-13 12:01 ` [PATCH RFT 1/2] gpio: gpio-ml-ioh: " Linus Walleij
2012-08-14 1:25 ` Feng Tang
2012-08-14 22:18 ` Linus Walleij
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