Patch "[media] Revert "[media] videobuf_vm_{open,close} race fixes"" has been added to the 3.13-stable tree

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This is a note to let you know that I've just added the patch titled

    [media] Revert "[media] videobuf_vm_{open,close} race fixes"

to the 3.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-videobuf_vm_-open-close-race-fixes.patch
and it can be found in the queue-3.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From cca36e2eecec2b8fc869a50ffd3bd0adeed92b8b Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hverkuil@xxxxxxxxx>
Date: Fri, 3 Jan 2014 08:10:49 -0300
Subject: [media] Revert "[media] videobuf_vm_{open,close} race fixes"

From: Hans Verkuil <hverkuil@xxxxxxxxx>

commit cca36e2eecec2b8fc869a50ffd3bd0adeed92b8b upstream.

This reverts commit a242f426108c284049a69710f871cc9f11b13e61.

That commit actually caused deadlocks, rather then fixing them.

If ext_lock is set to NULL (otherwise videobuf_queue_lock doesn't do
anything), then you get this deadlock:

The driver's mmap function calls videobuf_mmap_mapper which calls
videobuf_queue_lock on q. videobuf_mmap_mapper calls  __videobuf_mmap_mapper,
__videobuf_mmap_mapper calls videobuf_vm_open and videobuf_vm_open
calls videobuf_queue_lock on q (introduced by above patch): deadlocked.

This affects drivers using dma-contig and dma-vmalloc. Only dma-sg is
not affected since it doesn't call videobuf_vm_open from __videobuf_mmap_mapper.

Most drivers these days have a non-NULL ext_lock. Those that still use
NULL there are all fairly obscure drivers, which is why this hasn't been
seen earlier.

Since everything worked perfectly fine for many years I prefer to just
revert this patch rather than trying to fix it. videobuf is quite fragile
and I rather not touch it too much. Work is (slowly) progressing to move
everything over to vb2 or at the very least use non-NULL ext_lock in
videobuf.

Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Reported-by: Pete Eberlein <pete@xxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/media/v4l2-core/videobuf-dma-contig.c |   12 +++++-------
 drivers/media/v4l2-core/videobuf-dma-sg.c     |   10 ++++------
 drivers/media/v4l2-core/videobuf-vmalloc.c    |   10 ++++------
 3 files changed, 13 insertions(+), 19 deletions(-)

--- a/drivers/media/v4l2-core/videobuf-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf-dma-contig.c
@@ -66,14 +66,11 @@ static void __videobuf_dc_free(struct de
 static void videobuf_vm_open(struct vm_area_struct *vma)
 {
 	struct videobuf_mapping *map = vma->vm_private_data;
-	struct videobuf_queue *q = map->q;
 
-	dev_dbg(q->dev, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
+	dev_dbg(map->q->dev, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
 		map, map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
 	map->count++;
-	videobuf_queue_unlock(q);
 }
 
 static void videobuf_vm_close(struct vm_area_struct *vma)
@@ -85,11 +82,12 @@ static void videobuf_vm_close(struct vm_
 	dev_dbg(q->dev, "vm_close %p [count=%u,vma=%08lx-%08lx]\n",
 		map, map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
-	if (!--map->count) {
+	map->count--;
+	if (0 == map->count) {
 		struct videobuf_dma_contig_memory *mem;
 
 		dev_dbg(q->dev, "munmap %p q=%p\n", map, q);
+		videobuf_queue_lock(q);
 
 		/* We need first to cancel streams, before unmapping */
 		if (q->streaming)
@@ -128,8 +126,8 @@ static void videobuf_vm_close(struct vm_
 
 		kfree(map);
 
+		videobuf_queue_unlock(q);
 	}
-	videobuf_queue_unlock(q);
 }
 
 static const struct vm_operations_struct videobuf_vm_ops = {
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -338,14 +338,11 @@ EXPORT_SYMBOL_GPL(videobuf_dma_free);
 static void videobuf_vm_open(struct vm_area_struct *vma)
 {
 	struct videobuf_mapping *map = vma->vm_private_data;
-	struct videobuf_queue *q = map->q;
 
 	dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
 		map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
 	map->count++;
-	videobuf_queue_unlock(q);
 }
 
 static void videobuf_vm_close(struct vm_area_struct *vma)
@@ -358,9 +355,10 @@ static void videobuf_vm_close(struct vm_
 	dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
 		map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
-	if (!--map->count) {
+	map->count--;
+	if (0 == map->count) {
 		dprintk(1, "munmap %p q=%p\n", map, q);
+		videobuf_queue_lock(q);
 		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 			if (NULL == q->bufs[i])
 				continue;
@@ -376,9 +374,9 @@ static void videobuf_vm_close(struct vm_
 			q->bufs[i]->baddr = 0;
 			q->ops->buf_release(q, q->bufs[i]);
 		}
+		videobuf_queue_unlock(q);
 		kfree(map);
 	}
-	videobuf_queue_unlock(q);
 	return;
 }
 
--- a/drivers/media/v4l2-core/videobuf-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf-vmalloc.c
@@ -54,14 +54,11 @@ MODULE_LICENSE("GPL");
 static void videobuf_vm_open(struct vm_area_struct *vma)
 {
 	struct videobuf_mapping *map = vma->vm_private_data;
-	struct videobuf_queue *q = map->q;
 
 	dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n", map,
 		map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
 	map->count++;
-	videobuf_queue_unlock(q);
 }
 
 static void videobuf_vm_close(struct vm_area_struct *vma)
@@ -73,11 +70,12 @@ static void videobuf_vm_close(struct vm_
 	dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n", map,
 		map->count, vma->vm_start, vma->vm_end);
 
-	videobuf_queue_lock(q);
-	if (!--map->count) {
+	map->count--;
+	if (0 == map->count) {
 		struct videobuf_vmalloc_memory *mem;
 
 		dprintk(1, "munmap %p q=%p\n", map, q);
+		videobuf_queue_lock(q);
 
 		/* We need first to cancel streams, before unmapping */
 		if (q->streaming)
@@ -116,8 +114,8 @@ static void videobuf_vm_close(struct vm_
 
 		kfree(map);
 
+		videobuf_queue_unlock(q);
 	}
-	videobuf_queue_unlock(q);
 
 	return;
 }


Patches currently in stable-queue which might be from hverkuil@xxxxxxxxx are

queue-3.13/revert-videobuf_vm_-open-close-race-fixes.patch
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