linux-kernel - [PATCH 3/5] uio: Remove unused uio

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Date:	Mon, 20 Sep 2010 00:23:12 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Hans J. Koch" <hjk@...utronix.de>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/5] uio: Remove unused uio_info mmap method.


There are no drivers in the kernel that implement the uio_info mmap
method so there is no point in keeping it.

Further keeping the mmap method would necessitate wrapping all of the
methods in vm_operations_struct to successfully implement support for
hotunplugable hardware, and it I have yet to find a correct way to wrap
the the vm_operations_struct close method.

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 drivers/uio/uio.c          |    6 ------
 include/linux/uio_driver.h |    1 -
 2 files changed, 0 insertions(+), 7 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 95f25ae..fc52fbc 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -659,7 +659,6 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 	struct uio_device *idev = listener->dev;
 	int mi;
 	unsigned long requested_pages, actual_pages;
-	int ret = 0;
 
 	if (vma->vm_end < vma->vm_start)
 		return -EINVAL;
@@ -676,11 +675,6 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 	if (requested_pages > actual_pages)
 		return -EINVAL;
 
-	if (idev->info->mmap) {
-		ret = idev->info->mmap(idev->info, vma);
-		return ret;
-	}
-
 	switch (idev->info->mem[mi].memtype) {
 		case UIO_MEM_PHYS:
 			return uio_mmap_physical(vma);
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index d6188e5..33789d4 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -88,7 +88,6 @@ struct uio_info {
 	unsigned long		irq_flags;
 	void			*priv;
 	irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
-	int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
 	int (*open)(struct uio_info *info, struct inode *inode);
 	int (*release)(struct uio_info *info, struct inode *inode);
 	int (*irqcontrol)(struct uio_info *info, s32 irq_on);
-- 
1.7.2.2

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