summaryrefslogtreecommitdiff
path: root/drivers/char/nwflash.c
diff options
context:
space:
mode:
authorAkinobu Mita <akinobu.mita@gmail.com>2008-07-25 12:48:18 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 21:53:43 +0400
commit6ee8928d94841aa764aeaf645ad16daff811dc26 (patch)
tree04570a3c34e5589e910412f2850fa1b2345eafa2 /drivers/char/nwflash.c
parent236b8756a2b6f90498d45b2c36d43e5372f2d4b8 (diff)
downloadlinux-6ee8928d94841aa764aeaf645ad16daff811dc26.tar.xz
nwflash: use simple_read_from_buffer()
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/nwflash.c')
-rw-r--r--drivers/char/nwflash.c31
1 files changed, 8 insertions, 23 deletions
diff --git a/drivers/char/nwflash.c b/drivers/char/nwflash.c
index ba012c2bdf7a..f9f72a211292 100644
--- a/drivers/char/nwflash.c
+++ b/drivers/char/nwflash.c
@@ -122,35 +122,20 @@ static int flash_ioctl(struct inode *inodep, struct file *filep, unsigned int cm
static ssize_t flash_read(struct file *file, char __user *buf, size_t size,
loff_t *ppos)
{
- unsigned long p = *ppos;
- unsigned int count = size;
- int ret = 0;
+ ssize_t ret;
if (flashdebug)
printk(KERN_DEBUG "flash_read: flash_read: offset=0x%lX, "
"buffer=%p, count=0x%X.\n", p, buf, count);
+ /*
+ * We now lock against reads and writes. --rmk
+ */
+ if (mutex_lock_interruptible(&nwflash_mutex))
+ return -ERESTARTSYS;
- if (count)
- ret = -ENXIO;
-
- if (p < gbFlashSize) {
- if (count > gbFlashSize - p)
- count = gbFlashSize - p;
+ ret = simple_read_from_buffer(buf, size, ppos, FLASH_BASE, gbFlashSize);
+ mutex_unlock(&nwflash_mutex);
- /*
- * We now lock against reads and writes. --rmk
- */
- if (mutex_lock_interruptible(&nwflash_mutex))
- return -ERESTARTSYS;
-
- ret = copy_to_user(buf, (void *)(FLASH_BASE + p), count);
- if (ret == 0) {
- ret = count;
- *ppos += count;
- } else
- ret = -EFAULT;
- mutex_unlock(&nwflash_mutex);
- }
return ret;
}