imx-vpu: fix checks of IOGetVirtMem() return value

The IOGetVirtMem() routine returns the address of a memory block
or -1 (MAP_FAILED) to indicate an error.

Many callers of this routine tested the return value for <= 0
to detect failure, and at least with a 3G/1G memory split
configured in the kernel, a negative number (!= -1) is a
valid (successful) return value.

Without this patch, the IOSystemInit() will often detect
failure incorrectly.

Change-Id: I8b20ae5f74608307cbb810168024e8863599dbdb
Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

2 files changed, 85 insertions, 0 deletions

diff --git a/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu/0001-IOGetVirtMem-returns-1-MAP_FAILED-on-failure.patch b/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu/0001-IOGetVirtMem-returns-1-MAP_FAILED-on-failure.patch
new file mode 100644
index 000000000..348a5360d
--- /dev/null
+++ b/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu/0001-IOGetVirtMem-returns-1-MAP_FAILED-on-failure.patch
@@ -0,0 +1,83 @@
+From 3f3e374391ddc5e605f604e5bcdf95e29b1bcc39 Mon Sep 17 00:00:00 2001
+From: Eric Nelson <eric.nelson@boundarydevices.com>
+Date: Fri, 20 Jun 2014 19:42:38 -0700
+Subject: [PATCH] IOGetVirtMem returns -1 (MAP_FAILED) on failure
+
+Upstream-Status: Pending
+
+Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
+---
+ vpu/vpu_io.c  | 2 +-
+ vpu/vpu_io.h  | 2 ++
+ vpu/vpu_lib.c | 8 ++++----
+ 3 files changed, 7 insertions(+), 5 deletions(-)
+
+diff --git a/vpu/vpu_io.c b/vpu/vpu_io.c
+index 8cbb571..14759da 100644
+--- a/vpu/vpu_io.c
++++ b/vpu/vpu_io.c
+@@ -265,7 +265,7 @@ int IOSystemInit(void *callback)
+                goto err;
+        }
+ 
+-       if (IOGetVirtMem(&bit_work_addr) <= 0)
++       if (IOGetVirtMem(&bit_work_addr) == -1)
+                goto err;
+ #endif
+        UnlockVpu(vpu_semap);
+diff --git a/vpu/vpu_io.h b/vpu/vpu_io.h
+index 392e04a..1e6340d 100644
+--- a/vpu/vpu_io.h
++++ b/vpu/vpu_io.h
+@@ -64,6 +64,8 @@ int IOSystemInit(void *callback);
+ int IOSystemShutdown(void);
+ int IOGetPhyMem(vpu_mem_desc * buff);
+ int IOFreePhyMem(vpu_mem_desc * buff);
++
++/* returns -1 ((int)MAP_FAILED) on failure */
+ int IOGetVirtMem(vpu_mem_desc * buff);
+ int IOFreeVirtMem(vpu_mem_desc * buff);
+ int IOGetVShareMem(int size);
+diff --git a/vpu/vpu_lib.c b/vpu/vpu_lib.c
+index 1fb731b..7a7f42d 100644
+--- a/vpu/vpu_lib.c
++++ b/vpu/vpu_lib.c
+@@ -1764,7 +1764,7 @@ RetCode vpu_EncStartOneFrame(EncHandle handle, EncParam * param)
+                                err_msg("Unable to obtain physical mem\n");
+                                return RETCODE_FAILURE;
+                        }
+-                       if (IOGetVirtMem(&pEncInfo->picParaBaseMem) <= 0) {
++                       if (IOGetVirtMem(&pEncInfo->picParaBaseMem) == -1) {
+                                IOFreePhyMem(&pEncInfo->picParaBaseMem);
+                                pEncInfo->picParaBaseMem.phy_addr = 0;
+                                err_msg("Unable to obtain virtual mem\n");
+@@ -2982,7 +2982,7 @@ RetCode vpu_DecGetInitialInfo(DecHandle handle, DecInitialInfo * info)
+                        UnlockVpu(vpu_semap);
+                        return RETCODE_FAILURE;
+                }
+-               if (IOGetVirtMem(&pDecInfo->userDataBufMem) <= 0) {
++               if (IOGetVirtMem(&pDecInfo->userDataBufMem) == -1) {
+                        IOFreePhyMem(&pDecInfo->userDataBufMem);
+                        pDecInfo->userDataBufMem.phy_addr = 0;
+                        err_msg("Unable to obtain virtual mem\n");
+@@ -4017,7 +4017,7 @@ RetCode vpu_DecStartOneFrame(DecHandle handle, DecParam * param)
+                                UnlockVpu(vpu_semap);
+                                return RETCODE_FAILURE;
+                        }
+-                       if (IOGetVirtMem(&pDecInfo->picParaBaseMem) <= 0) {
++                       if (IOGetVirtMem(&pDecInfo->picParaBaseMem) == -1) {
+                                IOFreePhyMem(&pDecInfo->picParaBaseMem);
+                                pDecInfo->picParaBaseMem.phy_addr = 0;
+                                err_msg("Unable to obtain virtual mem\n");
+@@ -4057,7 +4057,7 @@ RetCode vpu_DecStartOneFrame(DecHandle handle, DecParam * param)
+                        UnlockVpu(vpu_semap);
+                        return RETCODE_FAILURE;
+                }
+-               if (IOGetVirtMem(&pDecInfo->userDataBufMem) <= 0) {
++               if (IOGetVirtMem(&pDecInfo->userDataBufMem) == -1) {
+                        IOFreePhyMem(&pDecInfo->userDataBufMem);
+                        pDecInfo->userDataBufMem.phy_addr = 0;
+                        err_msg("Unable to obtain virtual mem\n");
+-- 
+1.9.1
+
diff --git a/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu_3.10.17-1.0.0.bb b/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu_3.10.17-1.0.0.bb
index ce07766a9..7ed9590ce 100644
--- a/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu_3.10.17-1.0.0.bb
+++ b/meta-fsl-arm/recipes-bsp/imx-vpu/imx-vpu_3.10.17-1.0.0.bb
@@ -7,4 +7,6 @@ PE = "1"
 SRC_URI[md5sum] = "71ea1b803864101ebf88a1bab45514d2"
 SRC_URI[sha256sum] = "cd8a7bd50ff3274db76a331cc6622d3ba4bb7c790ce778f303e49187df2dfd72"
 
+SRC_URI_append = " file://0001-IOGetVirtMem-returns-1-MAP_FAILED-on-failure.patch"
+
 COMPATIBLE_MACHINE = "(mx6)"