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path: root/drivers/char/pcmcia/cm4040_cs.c
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Diffstat (limited to 'drivers/char/pcmcia/cm4040_cs.c')
-rw-r--r--drivers/char/pcmcia/cm4040_cs.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index 035084c..6181f8a 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -26,6 +26,7 @@
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/poll.h>
+#include <linux/smp_lock.h>
#include <linux/wait.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -448,23 +449,30 @@ static int cm4040_open(struct inode *inode, struct file *filp)
struct reader_dev *dev;
struct pcmcia_device *link;
int minor = iminor(inode);
+ int ret;
if (minor >= CM_MAX_DEV)
return -ENODEV;
+ lock_kernel();
link = dev_table[minor];
- if (link == NULL || !pcmcia_dev_present(link))
- return -ENODEV;
+ if (link == NULL || !pcmcia_dev_present(link)) {
+ ret = -ENODEV;
+ goto out;
+ }
- if (link->open)
- return -EBUSY;
+ if (link->open) {
+ ret = -EBUSY;
+ goto out;
+ }
dev = link->priv;
filp->private_data = dev;
if (filp->f_flags & O_NONBLOCK) {
DEBUGP(4, dev, "filep->f_flags O_NONBLOCK set\n");
- return -EAGAIN;
+ ret = -EAGAIN;
+ goto out;
}
link->open = 1;
@@ -473,7 +481,10 @@ static int cm4040_open(struct inode *inode, struct file *filp)
mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
- return nonseekable_open(inode, filp);
+ ret = nonseekable_open(inode, filp);
+out:
+ unlock_kernel();
+ return ret;
}
static int cm4040_close(struct inode *inode, struct file *filp)