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spidev: BKL removal 

Another step to removing ->ioctl and to removing the BKL

[dbrownell@users.sourceforge.net: take final step; BKL not needed]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-07-23 21:29:55 -07:00 committed by Linus Torvalds
parent 102eb97564
commit 4ef754b7d7
1 changed files with 13 additions and 6 deletions
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19
drivers/spi/spidev.c
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@ -228,7 +228,6 @@ static int spidev_message(struct spidev_data *spidev,
* We walk the array of user-provided transfers, using each one
* to initialize a kernel version of the same transfer.
*/
mutex_lock(&spidev->buf_lock);
buf = spidev->buffer;
total = 0;
for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers;
@ -296,14 +295,12 @@ static int spidev_message(struct spidev_data *spidev,
status = total;
done:
mutex_unlock(&spidev->buf_lock);
kfree(k_xfers);
return status;
}
static int
spidev_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
static long
spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int err = 0;
int retval = 0;
@ -341,6 +338,14 @@ spidev_ioctl(struct inode *inode, struct file *filp,
if (spi == NULL)
return -ESHUTDOWN;
/* use the buffer lock here for triple duty:
* - prevent I/O (from us) so calling spi_setup() is safe;
* - prevent concurrent SPI_IOC_WR_* from morphing
* data fields while SPI_IOC_RD_* reads them;
* - SPI_IOC_MESSAGE needs the buffer locked "normally".
*/
mutex_lock(&spidev->buf_lock);
switch (cmd) {
/* read requests */
case SPI_IOC_RD_MODE:
@ -456,6 +461,8 @@ spidev_ioctl(struct inode *inode, struct file *filp,
kfree(ioc);
break;
}
mutex_unlock(&spidev->buf_lock);
spi_dev_put(spi);
return retval;
}
@ -533,7 +540,7 @@ static struct file_operations spidev_fops = {
*/
.write = spidev_write,
.read = spidev_read,
.ioctl = spidev_ioctl,
.unlocked_ioctl = spidev_ioctl,
.open = spidev_open,
.release = spidev_release,
};