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gpiolib: cdev: replace locking wrappers for config_mutex with guards

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After the adoption of guard(), the locking wrappers that hold the
config_mutex for linereq_set_values() and linereq_set_config() no
longer add value, so combine them into the functions they wrap.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Kent Gibson 2023-12-21 09:20:39 +08:00 committed by Bartosz Golaszewski
parent b718fbfea9
commit 32d8e3b645
1 changed files with 44 additions and 59 deletions
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103
drivers/gpio/gpiolib-cdev.c
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@ -1454,14 +1454,19 @@ static long linereq_get_values(struct linereq *lr, void __user *ip)
return 0;
}
static long linereq_set_values_unlocked(struct linereq *lr,
struct gpio_v2_line_values *lv)
static long linereq_set_values(struct linereq *lr, void __user *ip)
{
DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX);
struct gpio_v2_line_values lv;
struct gpio_desc **descs;
unsigned int i, didx, num_set;
int ret;
if (copy_from_user(&lv, ip, sizeof(lv)))
return -EFAULT;
guard(mutex)(&lr->config_mutex);
/*
* gpiod_set_array_value_complex() requires compacted desc and val
* arrays, rather than the sparse ones in lv.
@ -1472,12 +1477,12 @@ static long linereq_set_values_unlocked(struct linereq *lr,
bitmap_zero(vals, GPIO_V2_LINES_MAX);
/* scan requested lines to determine the subset to be set */
for (num_set = 0, i = 0; i < lr->num_lines; i++) {
if (lv->mask & BIT_ULL(i)) {
if (lv.mask & BIT_ULL(i)) {
/* setting inputs is not allowed */
if (!test_bit(FLAG_IS_OUT, &lr->lines[i].desc->flags))
return -EPERM;
/* add to compacted values */
if (lv->bits & BIT_ULL(i))
if (lv.bits & BIT_ULL(i))
__set_bit(num_set, vals);
num_set++;
/* capture desc for the num_set == 1 case */
@ -1493,7 +1498,7 @@ static long linereq_set_values_unlocked(struct linereq *lr,
if (!descs)
return -ENOMEM;
for (didx = 0, i = 0; i < lr->num_lines; i++) {
if (lv->mask & BIT_ULL(i)) {
if (lv.mask & BIT_ULL(i)) {
descs[didx] = lr->lines[i].desc;
didx++;
}
@ -1507,66 +1512,15 @@ static long linereq_set_values_unlocked(struct linereq *lr,
return ret;
}
static long linereq_set_values(struct linereq *lr, void __user *ip)
{
struct gpio_v2_line_values lv;
if (copy_from_user(&lv, ip, sizeof(lv)))
return -EFAULT;
guard(mutex)(&lr->config_mutex);
return linereq_set_values_unlocked(lr, &lv);
}
static long linereq_set_config_unlocked(struct linereq *lr,
struct gpio_v2_line_config *lc)
static long linereq_set_config(struct linereq *lr, void __user *ip)
{
struct gpio_v2_line_config lc;
struct gpio_desc *desc;
struct line *line;
unsigned int i;
u64 flags, edflags;
int ret;
for (i = 0; i < lr->num_lines; i++) {
line = &lr->lines[i];
desc = lr->lines[i].desc;
flags = gpio_v2_line_config_flags(lc, i);
gpio_v2_line_config_flags_to_desc_flags(flags, &desc->flags);
edflags = flags & GPIO_V2_LINE_EDGE_DETECTOR_FLAGS;
/*
* Lines have to be requested explicitly for input
* or output, else the line will be treated "as is".
*/
if (flags & GPIO_V2_LINE_FLAG_OUTPUT) {
int val = gpio_v2_line_config_output_value(lc, i);
edge_detector_stop(line);
ret = gpiod_direction_output(desc, val);
if (ret)
return ret;
} else if (flags & GPIO_V2_LINE_FLAG_INPUT) {
ret = gpiod_direction_input(desc);
if (ret)
return ret;
ret = edge_detector_update(line, lc, i, edflags);
if (ret)
return ret;
}
WRITE_ONCE(line->edflags, edflags);
gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG);
}
return 0;
}
static long linereq_set_config(struct linereq *lr, void __user *ip)
{
struct gpio_v2_line_config lc;
int ret;
if (copy_from_user(&lc, ip, sizeof(lc)))
return -EFAULT;
@ -1576,7 +1530,38 @@ static long linereq_set_config(struct linereq *lr, void __user *ip)
guard(mutex)(&lr->config_mutex);
return linereq_set_config_unlocked(lr, &lc);
for (i = 0; i < lr->num_lines; i++) {
line = &lr->lines[i];
desc = lr->lines[i].desc;
flags = gpio_v2_line_config_flags(&lc, i);
gpio_v2_line_config_flags_to_desc_flags(flags, &desc->flags);
edflags = flags & GPIO_V2_LINE_EDGE_DETECTOR_FLAGS;
/*
* Lines have to be requested explicitly for input
* or output, else the line will be treated "as is".
*/
if (flags & GPIO_V2_LINE_FLAG_OUTPUT) {
int val = gpio_v2_line_config_output_value(&lc, i);
edge_detector_stop(line);
ret = gpiod_direction_output(desc, val);
if (ret)
return ret;
} else if (flags & GPIO_V2_LINE_FLAG_INPUT) {
ret = gpiod_direction_input(desc);
if (ret)
return ret;
ret = edge_detector_update(line, &lc, i, edflags);
if (ret)
return ret;
}
WRITE_ONCE(line->edflags, edflags);
gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG);
}
return 0;
}
static long linereq_ioctl_unlocked(struct file *file, unsigned int cmd,