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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-05-22 22:07:51 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 15:16:18 -0700
commit5cb4aeca8e8c29605703be5576825eb3257d8a92 (patch)
treeb33bd1668d65836c6f6ceb2d60ea75de0a664728
parent1160d0765660e14b44dffd931b28a3875d5d9e46 (diff)
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USB: usblcd: Push down BKL into driver
I'm pretty sure this can be eliminated however I couldn't prove (or find) what stopped the device vanishing mid IOCTL_GET_HARD_VERSION. Perhaps a USB wizard could double check that and see if the lock_kernel can go entirely. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/misc/usblcd.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/misc/usblcd.c b/drivers/usb/misc/usblcd.c
index 7f7021e..2db4228 100644
--- a/drivers/usb/misc/usblcd.c
+++ b/drivers/usb/misc/usblcd.c
@@ -146,7 +146,7 @@ static ssize_t lcd_read(struct file *file, char __user * buffer, size_t count, l
return retval;
}
-static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long lcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct usb_lcd *dev;
u16 bcdDevice;
@@ -158,12 +158,14 @@ static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
switch (cmd) {
case IOCTL_GET_HARD_VERSION:
+ lock_kernel();
bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
sprintf(buf,"%1d%1d.%1d%1d",
(bcdDevice & 0xF000)>>12,
(bcdDevice & 0xF00)>>8,
(bcdDevice & 0xF0)>>4,
(bcdDevice & 0xF));
+ unlock_kernel();
if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
return -EFAULT;
break;
@@ -272,7 +274,7 @@ static const struct file_operations lcd_fops = {
.read = lcd_read,
.write = lcd_write,
.open = lcd_open,
- .ioctl = lcd_ioctl,
+ .unlocked_ioctl = lcd_ioctl,
.release = lcd_release,
};