From: Quanyang Wang <quanyang.w...@windriver.com>
The commit 4ce1995313ecb ("gpio: use pinctrl_gpio_get_mux_owner")
intends to call pinctrl_gpio_get_mux_owner to mark the muxed pin as
"used" and copy "mux_owner" or "gpio_owner" to "info->consumer". So that
when calling gpioinfo at userspace, the "mux_owner" is printed as
"label" in the output of console:
root@nxp-s32g:~# gpioinfo gpiochip0
gpiochip0 - 191 lines:
...
line 5: "PA_05" unused input active-high
line 6: "PA_06" "401d8000.spi" input active-high [used]
line 7: "PA_07" "401d8000.spi" input active-high [used]
...
But there are 3 problems with the current implementation:
1. The parameter "gpio" of the function pinctrl_gpio_get_mux_owner
should be "gc->base + info->offset" rather than "info->offset".
2. The member "strict" of s32cc_pmx_ops can be used to mark the flag
GPIO_V2_LINE_FLAG_USED, so there is no need to use the funciton
pinctrl_gpio_get_mux_owner to do that.
3. The function pinctrl_gpio_get_mux_owner takes mutex so it must be
called before taking the spinlock, or else it triggers the following
calltrace:
[ 4640.017246] BUG: sleeping function called from invalid context at
kernel/locking/rtmutex_api.c:510
[ 4640.017264] in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 11395,
name: gpioinfo
[ 4640.017271] preempt_count: 0, expected: 0
[ 4640.017276] RCU nest depth: 1, expected: 0
[ 4640.017281] INFO: lockdep is turned off.
[ 4640.017290] CPU: 3 PID: 11395 Comm: gpioinfo Tainted: G W O
5.15.147-rt72-yocto-preempt-rt #1
[ 4640.017297] Hardware name: Freescale S32G399A (DT)
[ 4640.017302] Call trace:
[ 4640.017304] dump_backtrace+0x0/0x1c0
[ 4640.017319] show_stack+0x20/0x30
[ 4640.017325] dump_stack_lvl+0xb0/0xf4
[ 4640.017335] dump_stack+0x18/0x34
[ 4640.017342] __might_resched+0x15c/0x1e0
[ 4640.017351] __might_sleep+0x50/0xa0
[ 4640.017357] mutex_lock_nested+0x58/0xe0
[ 4640.017367] pinctrl_get_device_gpio_range+0x48/0x11c
[ 4640.017378] pinctrl_gpio_get_mux_owner+0x48/0x110
[ 4640.017386] gpio_desc_to_lineinfo+0x2a8/0x2dc
[ 4640.017396] lineinfo_get_v1+0x144/0x260
[ 4640.017405] gpio_ioctl_unlocked+0xf4/0x3d0
[ 4640.017410] gpio_ioctl+0x4c/0x74
[ 4640.017415] __arm64_sys_ioctl+0xb0/0xf4
[ 4640.017424] invoke_syscall+0x5c/0x130
[ 4640.017437] el0_svc_common.constprop.0+0x68/0x124
[ 4640.017445] do_el0_svc+0x4c/0xb0
[ 4640.017452] el0_svc+0x54/0x110
[ 4640.017458] el0t_64_sync_handler+0xa4/0x12c
[ 4640.017464] el0t_64_sync+0x1a0/0x1a4
Signed-off-by: Quanyang Wang <quanyang.w...@windriver.com>
---
drivers/gpio/gpiolib-cdev.c | 10 +++-------
drivers/pinctrl/freescale/pinctrl-s32cc-core.c | 1 +
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index c175dbeb5d65..e0238bb772a4 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -2240,7 +2240,6 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
unsigned long flags;
u32 debounce_period_us;
unsigned int num_attrs = 0;
- int ret;
memset(info, 0, sizeof(*info));
info->offset = gpio_chip_hwgpio(desc);
@@ -2255,6 +2254,9 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
ok_for_pinctrl =
pinctrl_gpio_can_use_line(gc->base + info->offset);
+ pinctrl_gpio_get_mux_owner(gc->base + info->offset, info->consumer,
+ sizeof(info->consumer));
+
spin_lock_irqsave(&gpio_lock, flags);
if (desc->name)
@@ -2268,12 +2270,6 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
if (desc->label)
strscpy(info->consumer, desc->label, sizeof(info->consumer));
- else {
- ret = pinctrl_gpio_get_mux_owner(gc->base + info->offset,
info->consumer,
- sizeof(info->consumer));
- if (!ret)
- info->flags |= GPIO_V2_LINE_FLAG_USED;
- }
if (test_bit(FLAG_REQUESTED, &desc->flags) ||
test_bit(FLAG_IS_HOGGED, &desc->flags) ||
diff --git a/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
b/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
index e1d0cc817b65..a711242dc626 100644
--- a/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
+++ b/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
@@ -553,6 +553,7 @@ static const struct pinmux_ops s32cc_pmx_ops = {
.gpio_request_enable = s32cc_pmx_gpio_request_enable,
.gpio_disable_free = s32cc_pmx_gpio_disable_free,
.gpio_set_direction = s32cc_pmx_gpio_set_direction,
+ .strict = true,
};
static int s32cc_pinconf_get(struct pinctrl_dev *pctldev,
--
2.25.1
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