mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
88 lines
2.7 KiB
Diff
88 lines
2.7 KiB
Diff
From 14139f66e4f4a678e30ed06764603cd050e06ffd Mon Sep 17 00:00:00 2001
|
|
From: Bulbul Dabi <bdabi@codeaurora.org>
|
|
Date: Tue, 31 May 2016 11:24:22 -0600
|
|
Subject: [PATCH] msm: kgsl: Reserve a context ID slot but don't populate
|
|
immediately
|
|
|
|
When creating a context allocate an ID but don't populate the slot
|
|
with the context pointer until we are done setup up the rest of the
|
|
process. This avoids a race if somebody tries to free the same
|
|
identifier before the create operation is complete.
|
|
|
|
Bug: 31824853
|
|
Change-Id: Ic0dedbadca5b4cc4ce567afad48a33078b549439
|
|
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
|
|
---
|
|
drivers/gpu/msm/kgsl.c | 21 +++++++++++++--------
|
|
1 file changed, 13 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/drivers/gpu/msm/kgsl.c b/drivers/gpu/msm/kgsl.c
|
|
index f8ab3d042a728..4383e77776163 100644
|
|
--- a/drivers/gpu/msm/kgsl.c
|
|
+++ b/drivers/gpu/msm/kgsl.c
|
|
@@ -516,21 +516,18 @@ void kgsl_context_dump(struct kgsl_context *context)
|
|
EXPORT_SYMBOL(kgsl_context_dump);
|
|
|
|
/* Allocate a new context ID */
|
|
-int _kgsl_get_context_id(struct kgsl_device *device,
|
|
- struct kgsl_context *context)
|
|
+int _kgsl_get_context_id(struct kgsl_device *device)
|
|
{
|
|
int id;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
write_lock(&device->context_lock);
|
|
- id = idr_alloc(&device->context_idr, context, 1,
|
|
+ /* Allocate the slot but don't put a pointer in it yet */
|
|
+ id = idr_alloc(&device->context_idr, NULL, 1,
|
|
KGSL_MEMSTORE_MAX, GFP_NOWAIT);
|
|
write_unlock(&device->context_lock);
|
|
idr_preload_end();
|
|
|
|
- if (id > 0)
|
|
- context->id = id;
|
|
-
|
|
return id;
|
|
}
|
|
|
|
@@ -554,7 +551,7 @@ int kgsl_context_init(struct kgsl_device_private *dev_priv,
|
|
char name[64];
|
|
int ret = 0, id;
|
|
|
|
- id = _kgsl_get_context_id(device, context);
|
|
+ id = _kgsl_get_context_id(device);
|
|
if (id == -ENOSPC) {
|
|
/*
|
|
* Before declaring that there are no contexts left try
|
|
@@ -565,7 +562,7 @@ int kgsl_context_init(struct kgsl_device_private *dev_priv,
|
|
mutex_unlock(&device->mutex);
|
|
flush_workqueue(device->events_wq);
|
|
mutex_lock(&device->mutex);
|
|
- id = _kgsl_get_context_id(device, context);
|
|
+ id = _kgsl_get_context_id(device);
|
|
}
|
|
|
|
if (id < 0) {
|
|
@@ -577,6 +574,8 @@ int kgsl_context_init(struct kgsl_device_private *dev_priv,
|
|
return id;
|
|
}
|
|
|
|
+ context->id = id;
|
|
+
|
|
kref_init(&context->refcount);
|
|
/*
|
|
* Get a refernce to the process private so its not destroyed, until
|
|
@@ -2580,6 +2579,12 @@ long kgsl_ioctl_drawctxt_create(struct kgsl_device_private *dev_priv,
|
|
goto done;
|
|
}
|
|
trace_kgsl_context_create(dev_priv->device, context, param->flags);
|
|
+
|
|
+ /* Commit the pointer to the context in context_idr */
|
|
+ write_lock(&device->context_lock);
|
|
+ idr_replace(&device->context_idr, context, context->id);
|
|
+ write_unlock(&device->context_lock);
|
|
+
|
|
param->drawctxt_id = context->id;
|
|
done:
|
|
mutex_unlock(&device->mutex);
|