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gpio: Don't fiddle with irqchips marked as immutable 

In order to move away from gpiolib messing with the internals of
unsuspecting irqchips, add a flag by which irqchips advertise
that they are not to be messed with, and do solemnly swear that
they correctly call into the gpiolib helpers when required.

Also nudge the users into converting their drivers to the
new model.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220419141846.598305-2-maz@kernel.org
This commit is contained in:
Marc Zyngier 2022-04-19 15:18:37 +01:00
parent 3123109284
commit 6c846d026d
3 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpio/gpiolib.c
View File

@ -1475,6 +1475,11 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc)
{
struct irq_chip *irqchip = gc->irq.chip;
if (irqchip->flags & IRQCHIP_IMMUTABLE)
return;
chip_warn(gc, "not an immutable chip, please consider fixing it!\n");
if (!irqchip->irq_request_resources &&
!irqchip->irq_release_resources) {
irqchip->irq_request_resources = gpiochip_irq_reqres;
@ -1633,7 +1638,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc)
irq_domain_remove(gc->irq.domain);
}
if (irqchip) {
if (irqchip && !(irqchip->flags & IRQCHIP_IMMUTABLE)) {
if (irqchip->irq_request_resources == gpiochip_irq_reqres) {
irqchip->irq_request_resources = NULL;
irqchip->irq_release_resources = NULL;

2
include/linux/irq.h
View File

@ -569,6 +569,7 @@ struct irq_chip {
* IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs
* in the suspend path if they are in disabled state
* IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup
* IRQCHIP_IMMUTABLE: Don't ever change anything in this chip
*/
enum {
IRQCHIP_SET_TYPE_MASKED = (1 << 0),
@ -582,6 +583,7 @@ enum {
IRQCHIP_SUPPORTS_NMI = (1 << 8),
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9),
IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10),
IRQCHIP_IMMUTABLE = (1 << 11),
};
#include <linux/irqdesc.h>

1
kernel/irq/debugfs.c
View File

@ -58,6 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = {
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
BIT_MASK_DESCR(IRQCHIP_IMMUTABLE),
};
static void