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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-04-10 19:47:18 +0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-04-10 18:51:15 +0400
commit7cfe21aae155c26193fde617dc61d37a79a63f86 (patch)
tree6600d3171afdfad430155f5e8a1f526367a6174d /drivers/ieee1394
parent3ac26b2ee30005930117fe6a180c139c5f300faf (diff)
downloadlinux-7cfe21aae155c26193fde617dc61d37a79a63f86.tar.xz
ieee1394: mark char device files as not seekable
The - raw1394 (/dev/raw1394), - video1394 (/dev/video1394/*), - dv1394 (/dev/dv1394/*) character device file ABIs do not make any use of lseek(), pread(), or pwrite(). Therefore use nonseekable_open() and, redundantly, set file_operations.llseek to no_llseek to remove any doubt whether the BKL- grabbing default_llseek handler is used. Although all this is legacy code which should be left in peace until it is eventually removed (as it is superseded by firewire-core's <linux/firewire-cdev.h> ABI), this change seems still worth doing to further minimize the presence of BKL usage in the kernel. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/ieee1394')
-rw-r--r--drivers/ieee1394/dv1394.c11
-rw-r--r--drivers/ieee1394/raw1394.c3
-rw-r--r--drivers/ieee1394/video1394.c5
3 files changed, 11 insertions, 8 deletions
diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
index 9fd4a0d3206e..adaefabc40e9 100644
--- a/drivers/ieee1394/dv1394.c
+++ b/drivers/ieee1394/dv1394.c
@@ -1824,7 +1824,7 @@ static int dv1394_open(struct inode *inode, struct file *file)
"and will not be available in the new firewire driver stack. "
"Try libraw1394 based programs instead.\n", current->comm);
- return 0;
+ return nonseekable_open(inode, file);
}
@@ -2153,17 +2153,18 @@ static struct cdev dv1394_cdev;
static const struct file_operations dv1394_fops=
{
.owner = THIS_MODULE,
- .poll = dv1394_poll,
+ .poll = dv1394_poll,
.unlocked_ioctl = dv1394_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = dv1394_compat_ioctl,
#endif
.mmap = dv1394_mmap,
.open = dv1394_open,
- .write = dv1394_write,
- .read = dv1394_read,
+ .write = dv1394_write,
+ .read = dv1394_read,
.release = dv1394_release,
- .fasync = dv1394_fasync,
+ .fasync = dv1394_fasync,
+ .llseek = no_llseek,
};
diff --git a/drivers/ieee1394/raw1394.c b/drivers/ieee1394/raw1394.c
index 8aa56ac07e29..b563d5e9fa2e 100644
--- a/drivers/ieee1394/raw1394.c
+++ b/drivers/ieee1394/raw1394.c
@@ -2834,7 +2834,7 @@ static int raw1394_open(struct inode *inode, struct file *file)
file->private_data = fi;
- return 0;
+ return nonseekable_open(inode, file);
}
static int raw1394_release(struct inode *inode, struct file *file)
@@ -3035,6 +3035,7 @@ static const struct file_operations raw1394_fops = {
.poll = raw1394_poll,
.open = raw1394_open,
.release = raw1394_release,
+ .llseek = no_llseek,
};
static int __init init_raw1394(void)
diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
index 949064a05675..a42bd6893bcf 100644
--- a/drivers/ieee1394/video1394.c
+++ b/drivers/ieee1394/video1394.c
@@ -1239,7 +1239,7 @@ static int video1394_open(struct inode *inode, struct file *file)
ctx->current_ctx = NULL;
file->private_data = ctx;
- return 0;
+ return nonseekable_open(inode, file);
}
static int video1394_release(struct inode *inode, struct file *file)
@@ -1287,7 +1287,8 @@ static const struct file_operations video1394_fops=
.poll = video1394_poll,
.mmap = video1394_mmap,
.open = video1394_open,
- .release = video1394_release
+ .release = video1394_release,
+ .llseek = no_llseek,
};
/*** HOTPLUG STUFF **********************************************************/