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From: Stephane Viau <sviau@codeaurora.org>
To: dri-devel@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm/msm/mdp5: Fix negative SMP block allocation
Date: Fri, 16 Jan 2015 13:22:14 -0500	[thread overview]
Message-ID: <1421432534-27808-1-git-send-email-sviau@codeaurora.org> (raw)

In case we request a number of SMP blocks which is lower than
the already reserved blocks, we should not try to allocate a
negative number, but 0 blocks instead.

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
index bf55188..1f795af89 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
@@ -119,9 +119,10 @@ static int smp_request_block(struct mdp5_smp *smp,
 
 	spin_lock_irqsave(&smp->state_lock, flags);
 
-	nblks -= reserved;
-	if (reserved)
+	if (reserved) {
+		nblks = max(0, nblks - reserved);
 		DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
+	}
 
 	avail = cnt - bitmap_weight(smp->state, cnt);
 	if (nblks > avail) {
-- 
Qualcomm Innovation Center, Inc.

The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project

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WARNING: multiple messages have this Message-ID (diff)
From: Stephane Viau <sviau@codeaurora.org>
To: dri-devel@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	robdclark@gmail.com, Stephane Viau <sviau@codeaurora.org>
Subject: [PATCH] drm/msm/mdp5: Fix negative SMP block allocation
Date: Fri, 16 Jan 2015 13:22:14 -0500	[thread overview]
Message-ID: <1421432534-27808-1-git-send-email-sviau@codeaurora.org> (raw)

In case we request a number of SMP blocks which is lower than
the already reserved blocks, we should not try to allocate a
negative number, but 0 blocks instead.

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
index bf55188..1f795af89 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
@@ -119,9 +119,10 @@ static int smp_request_block(struct mdp5_smp *smp,
 
 	spin_lock_irqsave(&smp->state_lock, flags);
 
-	nblks -= reserved;
-	if (reserved)
+	if (reserved) {
+		nblks = max(0, nblks - reserved);
 		DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
+	}
 
 	avail = cnt - bitmap_weight(smp->state, cnt);
 	if (nblks > avail) {
-- 
Qualcomm Innovation Center, Inc.

The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project


             reply	other threads:[~2015-01-16 18:22 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-16 18:22 Stephane Viau [this message]
2015-01-16 18:22 ` [PATCH] drm/msm/mdp5: Fix negative SMP block allocation Stephane Viau

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