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5a0d83a316
Includes experimental video decoder driver. Thanks as always to @miouyouyou for the base patches
76 lines
2.6 KiB
Diff
76 lines
2.6 KiB
Diff
From 9bf91a052d8ceddfd5808547a51e167fb7463754 Mon Sep 17 00:00:00 2001
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From: "Miouyouyou (Myy)" <myy@miouyouyou.fr>
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Date: Wed, 18 Jul 2018 19:59:21 +0200
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Subject: [PATCH] GPU: Mali: Midgard: remove rcu_read_lock references
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This patch is actually based on @mihailescu2m patch.
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This removes references to rcu_read_lock when acquiring the OPP table,
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as it is useless since.
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See :
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/base/power/opp/core.c?id=5b650b388844f26c61c70564865598836d05dcb3
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The current rcu_read_lock actually generates some issues with recent
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kernels.
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See here :
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https://community.arm.com/graphics/f/discussions/9207/midgard-r20p0-kernel-drivers-errors
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The patch has been recreated since it does not apply directly on r19p0
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sources (I guess the affected line numbers slightly differ...).
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@mihailescu2m patch for the Mali Midgard r20p0 kernel driver can be
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acquired here :
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https://github.com/mihailescu2m/linux/commit/bbe73c3c1143e5991bdcaee3afaecf5c31af0647
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Signed-off-by: Miouyouyou (Myy) <myy@miouyouyou.fr>
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---
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drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c | 7 +------
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1 file changed, 1 insertion(+), 6 deletions(-)
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diff --git a/drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c b/drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c
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index e280322e..bf69d897 100644
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--- a/drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c
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+++ b/drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c
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@@ -87,10 +87,9 @@ kbase_devfreq_target(struct device *dev, unsigned long *target_freq, u32 flags)
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freq = *target_freq;
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- rcu_read_lock();
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opp = devfreq_recommended_opp(dev, &freq, flags);
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voltage = dev_pm_opp_get_voltage(opp);
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- rcu_read_unlock();
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+
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if (IS_ERR_OR_NULL(opp)) {
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dev_err(dev, "Failed to get opp (%ld)\n", PTR_ERR(opp));
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return PTR_ERR(opp);
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@@ -186,20 +185,17 @@ static int kbase_devfreq_init_freq_table(struct kbase_device *kbdev,
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unsigned long freq;
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struct dev_pm_opp *opp;
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- rcu_read_lock();
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count = dev_pm_opp_get_opp_count(kbdev->dev);
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if (count < 0) {
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rcu_read_unlock();
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return count;
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}
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- rcu_read_unlock();
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dp->freq_table = kmalloc_array(count, sizeof(dp->freq_table[0]),
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GFP_KERNEL);
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if (!dp->freq_table)
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return -ENOMEM;
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- rcu_read_lock();
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for (i = 0, freq = ULONG_MAX; i < count; i++, freq--) {
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opp = dev_pm_opp_find_freq_floor(kbdev->dev, &freq);
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if (IS_ERR(opp))
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@@ -207,7 +203,6 @@ static int kbase_devfreq_init_freq_table(struct kbase_device *kbdev,
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dp->freq_table[i] = freq;
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}
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- rcu_read_unlock();
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if (count != i)
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dev_warn(kbdev->dev, "Unable to enumerate all OPPs (%d!=%d\n",
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--
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2.16.4
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