linux-kernel - [PATCH] drm/nouveau/dmem: missing mutex

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Date:   Thu, 13 Jun 2019 17:11:21 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Jerome Glisse <jglisse@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        "Ben Skeggs" <bskeggs@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
CC:     <nouveau@...ts.freedesktop.org>, <linux-mm@...ck.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Ralph Campbell" <rcampbell@...dia.com>
Subject: [PATCH] drm/nouveau/dmem: missing mutex_lock in error path

In nouveau_dmem_pages_alloc(), the drm->dmem->mutex is unlocked before
calling nouveau_dmem_chunk_alloc().
Reacquire the lock before continuing to the next page.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
---

I found this while testing Jason Gunthorpe's hmm tree but this is
independant of those changes. I guess it could go through
David Airlie's tree for nouveau or Jason's tree.

 drivers/gpu/drm/nouveau/nouveau_dmem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 27aa4e72abe9..00f7236af1b9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -379,9 +379,10 @@ nouveau_dmem_pages_alloc(struct nouveau_drm *drm,
 			ret = nouveau_dmem_chunk_alloc(drm);
 			if (ret) {
 				if (c)
-					break;
+					return 0;
 				return ret;
 			}
+			mutex_lock(&drm->dmem->mutex);
 			continue;
 		}
 
-- 
2.20.1