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ENGR00309915 [#1087] enhanced video memory mutex
this patch can fix NULL pointer issue in GPU kernel driver with the following log [<7f240438>] (gckEVENT_AddList+0x0/0x810 [galcore]) from [<7f239ebc>] (gckCOMMAND_Commit+0xf28/0x118c [galcore]) [<7f238f94>] (gckCOMMAND_Commit+0x0/0x118c [galcore]) from [<7f2362dc>] (gckKERNEL_Dispatch+0x120c/0x24e4 [galcore]) [<7f2350d0>] (gckKERNEL_Dispatch+0x0/0x24e4 [galcore]) from [<7f222280>] (drv_ioctl+0x390/0x540 [galcore]) [<7f221ef0>] (drv_ioctl+0x0/0x540 [galcore]) from [<800facd0>] (vfs_ioctl+0x30/0x44) The false code is at 0x217bc where the 0-pointer happens (r3 = 0) gcuVIDMEM_NODE_PTR node = (gcuVIDMEM_NODE_PTR)(gcmUINT64_TO_PTR(Record->info.u.FreeVideoMemory.node)); 217b8: e5953028 ldr r3, [r5, torvalds#40] ; 0x28 if (node->VidMem.memory->object.type == gcvOBJ_VIDMEM) 217bc: e5932000 ldr r2, [r3] 217c0: e5922000 ldr r2, [r2] 217c4: e152000a cmp r2, sl { gcmkVERIFY_OK(gckKERNEL_RemoveProcessDB(Event->kernel, Date: Apr 23, 2014 Signed-off-by: Xianzhong <b07117@freescale.com> Acked-by: Jason Liu
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