Patch "drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2)" has been added to the 3.11-stable tree

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

    drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2)

to the 3.11-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:
     drm-radeon-make-r100_cp_ring_info-and-radeon_ring_gfx-safe-v2.patch
and it can be found in the queue-3.11 subdirectory.

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


>From 0eb3448aa6b31fbf24c31756aba7940cac5ad6b8 Mon Sep 17 00:00:00 2001
From: Alex Ivanov <gnidorah@xxxxxxxxx>
Date: Fri, 20 Sep 2013 17:36:06 +0400
Subject: drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2)

From: Alex Ivanov <gnidorah@xxxxxxxxx>

commit 0eb3448aa6b31fbf24c31756aba7940cac5ad6b8 upstream.

Prevent NULL pointer dereference in case when radeon_ring_fini() did it's job.

Reading of r100_cp_ring_info and radeon_ring_gfx debugfs entries will lead to a KP if ring buffer was deallocated, e.g. on failed ring test.
Seen on PA-RISC machine having "radeon: ring test failed (scratch(0x8504)=0xCAFEDEAD)" issue.

v2: agd5f: add some parens around ring->ready check

Signed-off-by: Alex Ivanov <gnidorah@xxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/radeon/r100.c        |    8 +++++---
 drivers/gpu/drm/radeon/radeon_ring.c |    8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -2926,9 +2926,11 @@ static int r100_debugfs_cp_ring_info(str
 	seq_printf(m, "CP_RB_RPTR 0x%08x\n", rdp);
 	seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
 	seq_printf(m, "%u dwords in ring\n", count);
-	for (j = 0; j <= count; j++) {
-		i = (rdp + j) & ring->ptr_mask;
-		seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
+	if (ring->ready) {
+		for (j = 0; j <= count; j++) {
+			i = (rdp + j) & ring->ptr_mask;
+			seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
+		}
 	}
 	return 0;
 }
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -846,9 +846,11 @@ static int radeon_debugfs_ring_info(stru
 	 * packet that is the root issue
 	 */
 	i = (ring->rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask;
-	for (j = 0; j <= (count + 32); j++) {
-		seq_printf(m, "r[%5d]=0x%08x\n", i, ring->ring[i]);
-		i = (i + 1) & ring->ptr_mask;
+	if (ring->ready) {
+		for (j = 0; j <= (count + 32); j++) {
+			seq_printf(m, "r[%5d]=0x%08x\n", i, ring->ring[i]);
+			i = (i + 1) & ring->ptr_mask;
+		}
 	}
 	return 0;
 }


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

queue-3.11/drm-radeon-disable-tests-benchmarks-if-accel-is-disabled.patch
queue-3.11/drm-radeon-make-r100_cp_ring_info-and-radeon_ring_gfx-safe-v2.patch
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