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sf: Fix incorrect state reporting in dumpsys 

Dumpsys utility accesses layer compositionType variable
with out proper protection. These variables are modified
during hwc_prepare call. Existing HAL lock protection is not
sufficient to address this issue. Failure to do this will
result in incorrect state reporting in dumpsys.

A new displayLock mutex in HWComposer will be used in both
dumpsys and draw calls to ensure correct state is accessed.

Change-Id: I8a57de59525adc0e089b3bed95c067c01e42b666
This commit is contained in:
Manoj Kumar AVM 2015-06-11 14:18:14 -07:00 committed by Naseer Ahmed
parent 85e271d051
commit e54506b81a
2 changed files with 4 additions and 0 deletions
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2
services/surfaceflinger/DisplayHardware/HWComposer.cpp
View File

@ -635,6 +635,7 @@ status_t HWComposer::setFramebufferTarget(int32_t id,
}
status_t HWComposer::prepare() {
Mutex::Autolock _l(mDisplayLock);
for (size_t i=0 ; i<mNumDisplays ; i++) {
DisplayData& disp(mDisplayData[i]);
if (disp.framebufferTarget) {
@ -1145,6 +1146,7 @@ static String8 getFormatStr(PixelFormat format) {
}
void HWComposer::dump(String8& result) const {
Mutex::Autolock _l(mDisplayLock);
if (mHwc) {
result.appendFormat("Hardware Composer state (version %08x):\n", hwcApiVersion(mHwc));
result.appendFormat(" mDebugForceFakeVSync=%d\n", mDebugForceFakeVSync);

2
services/surfaceflinger/DisplayHardware/HWComposer.h
View File

@ -354,6 +354,8 @@ private:
// mLists[i>0] can be NULL. that display is to be ignored
struct hwc_display_contents_1* mLists[MAX_HWC_DISPLAYS];
DisplayData mDisplayData[MAX_HWC_DISPLAYS];
// protect mDisplayData from races between prepare and dump
mutable Mutex mDisplayLock;
size_t mNumDisplays;
cb_context* mCBContext;