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gpiolib: cdev: refactor linehandle cleanup into linehandle_free

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Consolidate the cleanup of linehandles, currently duplicated in
linehandle_create and linehandle_release, into a helper function
linehandle_free.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson 2020-07-08 12:15:55 +08:00 committed by Bartosz Golaszewski
parent 1bf7ba4001
commit 883f919818
1 changed files with 19 additions and 20 deletions
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39
drivers/gpio/gpiolib-cdev.c
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@ -228,17 +228,21 @@ static long linehandle_ioctl_compat(struct file *file, unsigned int cmd,
}
#endif
static int linehandle_release(struct inode *inode, struct file *file)
static void linehandle_free(struct linehandle_state *lh)
{
struct linehandle_state *lh = file->private_data;
struct gpio_device *gdev = lh->gdev;
int i;
for (i = 0; i < lh->num_descs; i++)
gpiod_free(lh->descs[i]);
if (lh->descs[i])
gpiod_free(lh->descs[i]);
kfree(lh->label);
put_device(&lh->gdev->dev);
kfree(lh);
put_device(&gdev->dev);
}
static int linehandle_release(struct inode *inode, struct file *file)
{
linehandle_free(file->private_data);
return 0;
}
@ -257,7 +261,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
struct gpiohandle_request handlereq;
struct linehandle_state *lh;
struct file *file;
int fd, i, count = 0, ret;
int fd, i, ret;
u32 lflags;
if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
@ -288,6 +292,8 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
}
}
lh->num_descs = handlereq.lines;
/* Request each GPIO */
for (i = 0; i < handlereq.lines; i++) {
u32 offset = handlereq.lineoffsets[i];
@ -295,19 +301,18 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
if (IS_ERR(desc)) {
ret = PTR_ERR(desc);
goto out_free_descs;
goto out_free_lh;
}
ret = gpiod_request(desc, lh->label);
if (ret)
goto out_free_descs;
goto out_free_lh;
lh->descs[i] = desc;
count = i + 1;
linehandle_flags_to_desc_flags(handlereq.flags, &desc->flags);
ret = gpiod_set_transitory(desc, false);
if (ret < 0)
goto out_free_descs;
goto out_free_lh;
/*
* Lines have to be requested explicitly for input
@ -318,11 +323,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
ret = gpiod_direction_output(desc, val);
if (ret)
goto out_free_descs;
goto out_free_lh;
} else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
ret = gpiod_direction_input(desc);
if (ret)
goto out_free_descs;
goto out_free_lh;
}
blocking_notifier_call_chain(&desc->gdev->notifier,
@ -331,12 +336,11 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
offset);
}
lh->num_descs = handlereq.lines;
fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
if (fd < 0) {
ret = fd;
goto out_free_descs;
goto out_free_lh;
}
file = anon_inode_getfile("gpio-linehandle",
@ -368,13 +372,8 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
out_put_unused_fd:
put_unused_fd(fd);
out_free_descs:
for (i = 0; i < count; i++)
gpiod_free(lh->descs[i]);
kfree(lh->label);
out_free_lh:
kfree(lh);
put_device(&gdev->dev);
linehandle_free(lh);
return ret;
}