From c5d5a32ead1e3a61a07a1e59eb52a53e4a6b2a7f Mon Sep 17 00:00:00 2001
From: Navid Emamdoost <navid.emamdoost@gmail.com>
Date: Mon, 15 Jun 2020 01:12:20 -0500
Subject: [PATCH] drm/etnaviv: fix ref count leak via pm_runtime_get_sync
Git-commit: c5d5a32ead1e3a61a07a1e59eb52a53e4a6b2a7f
Patch-mainline: v5.9-rc1
References: git-fixes
in etnaviv_gpu_submit, etnaviv_gpu_recover_hang, etnaviv_gpu_debugfs,
and etnaviv_gpu_init the call to pm_runtime_get_sync increments the
counter even in case of failure, leading to incorrect ref count.
In case of failure, decrement the ref count before returning.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -694,7 +694,7 @@ int etnaviv_gpu_init(struct etnaviv_gpu
ret = pm_runtime_get_sync(gpu->dev);
if (ret < 0) {
dev_err(gpu->dev, "Failed to enable GPU power domain\n");
- return ret;
+ goto pm_put;
}
etnaviv_hw_identify(gpu);
@@ -808,6 +808,7 @@ destroy_iommu:
gpu->mmu = NULL;
fail:
pm_runtime_mark_last_busy(gpu->dev);
+pm_put:
pm_runtime_put_autosuspend(gpu->dev);
return ret;
@@ -848,7 +849,7 @@ int etnaviv_gpu_debugfs(struct etnaviv_g
ret = pm_runtime_get_sync(gpu->dev);
if (ret < 0)
- return ret;
+ goto pm_put;
dma_lo = gpu_read(gpu, VIVS_FE_DMA_LOW);
dma_hi = gpu_read(gpu, VIVS_FE_DMA_HIGH);
@@ -971,6 +972,7 @@ int etnaviv_gpu_debugfs(struct etnaviv_g
ret = 0;
pm_runtime_mark_last_busy(gpu->dev);
+pm_put:
pm_runtime_put_autosuspend(gpu->dev);
return ret;
@@ -984,7 +986,7 @@ void etnaviv_gpu_recover_hang(struct etn
dev_err(gpu->dev, "recover hung GPU!\n");
if (pm_runtime_get_sync(gpu->dev) < 0)
- return;
+ goto pm_put;
mutex_lock(&gpu->lock);
@@ -1002,6 +1004,7 @@ void etnaviv_gpu_recover_hang(struct etn
mutex_unlock(&gpu->lock);
pm_runtime_mark_last_busy(gpu->dev);
+pm_put:
pm_runtime_put_autosuspend(gpu->dev);
}
@@ -1274,8 +1277,10 @@ struct dma_fence *etnaviv_gpu_submit(str
if (!submit->runtime_resumed) {
ret = pm_runtime_get_sync(gpu->dev);
- if (ret < 0)
+ if (ret < 0) {
+ pm_runtime_put_noidle(gpu->dev);
return NULL;
+ }
submit->runtime_resumed = true;
}
@@ -1292,6 +1297,7 @@ struct dma_fence *etnaviv_gpu_submit(str
ret = event_alloc(gpu, nr_events, event);
if (ret) {
DRM_ERROR("no free events\n");
+ pm_runtime_put_noidle(gpu->dev);
return NULL;
}