linux-kernel - [PATCH v2] drm/amdkfd: validate pdd where it acquired first

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Date:	Thu, 09 Jul 2015 14:41:53 +0530
From:	Maninder Singh <maninder1.s@...sung.com>
To:	oded.gabbay@...il.com, airlied@...ux.ie,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:	pankaj.m@...sung.com, Maninder Singh <maninder1.s@...sung.com>
Subject: [PATCH v2] drm/amdkfd: validate pdd where it acquired first

Currently pdd is validate after dereferencing it, which is
not correct, Thus validate pdd before its first use.

Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
---
v1: remove validation of pdd after its usage
v2: do validation at first place rather than removing

 drivers/gpu/drm/amd/amdkfd/kfd_process.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 8a1f999..9be0070 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -420,6 +420,12 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 	pqm_uninit(&p->pqm);
 
 	pdd = kfd_get_process_device_data(dev, p);
+
+	if (!pdd) {
+		mutex_unlock(&p->mutex);
+		return;
+	}
+
 	if (pdd->reset_wavefronts) {
 		dbgdev_wave_reset_wavefronts(pdd->dev, p);
 		pdd->reset_wavefronts = false;
@@ -431,8 +437,7 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 	 * We don't call amd_iommu_unbind_pasid() here
 	 * because the IOMMU called us.
 	 */
-	if (pdd)
-		pdd->bound = false;
+	pdd->bound = false;
 
 	mutex_unlock(&p->mutex);
 }
-- 
1.7.9.5

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