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-rw-r--r--drivers/auxdisplay/charlcd.c11
-rw-r--r--drivers/auxdisplay/panel.c11
2 files changed, 18 insertions, 4 deletions
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index cfeb049a01ef..642afd88870b 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -647,18 +647,25 @@ static ssize_t charlcd_write(struct file *file, const char __user *buf,
static int charlcd_open(struct inode *inode, struct file *file)
{
struct charlcd_priv *priv = to_priv(the_charlcd);
+ int ret;
+ ret = -EBUSY;
if (!atomic_dec_and_test(&charlcd_available))
- return -EBUSY; /* open only once at a time */
+ goto fail; /* open only once at a time */
+ ret = -EPERM;
if (file->f_mode & FMODE_READ) /* device is write-only */
- return -EPERM;
+ goto fail;
if (priv->must_clear) {
charlcd_clear_display(&priv->lcd);
priv->must_clear = false;
}
return nonseekable_open(inode, file);
+
+ fail:
+ atomic_inc(&charlcd_available);
+ return ret;
}
static int charlcd_release(struct inode *inode, struct file *file)
diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
index df126dcdaf18..6911acd896d9 100644
--- a/drivers/auxdisplay/panel.c
+++ b/drivers/auxdisplay/panel.c
@@ -1105,14 +1105,21 @@ static ssize_t keypad_read(struct file *file,
static int keypad_open(struct inode *inode, struct file *file)
{
+ int ret;
+
+ ret = -EBUSY;
if (!atomic_dec_and_test(&keypad_available))
- return -EBUSY; /* open only once at a time */
+ goto fail; /* open only once at a time */
+ ret = -EPERM;
if (file->f_mode & FMODE_WRITE) /* device is read-only */
- return -EPERM;
+ goto fail;
keypad_buflen = 0; /* flush the buffer on opening */
return 0;
+ fail:
+ atomic_inc(&keypad_available);
+ return ret;
}
static int keypad_release(struct inode *inode, struct file *file)