libcamera: Update the patch to upstreamed one

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 90 insertions, 11 deletions

diff --git a/meta-multimedia/recipes-multimedia/libcamera/libcamera/0001-uvcvideo-Use-auto-variable-to-avoid-range-loop-warni.patch b/meta-multimedia/recipes-multimedia/libcamera/libcamera/0001-uvcvideo-Use-auto-variable-to-avoid-range-loop-warni.patch
index 4ca412c695..cec5fc2872 100644
--- a/meta-multimedia/recipes-multimedia/libcamera/libcamera/0001-uvcvideo-Use-auto-variable-to-avoid-range-loop-warni.patch
+++ b/meta-multimedia/recipes-multimedia/libcamera/libcamera/0001-uvcvideo-Use-auto-variable-to-avoid-range-loop-warni.patch
@@ -1,27 +1,104 @@
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+From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+To: libcamera-devel@lists.libcamera.org
+Cc: Khem Raj <raj.khem@gmail.com>
+Subject: [PATCH v2] libcamera: pipeline: uvcvideo: Avoid reference to temporary object
+Date: Sun, 28 Mar 2021 05:57:41 +0300
+Message-Id: <20210328025741.30246-1-laurent.pinchart@ideasonboard.com>
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+
 From: Khem Raj <raj.khem@gmail.com>
-Date: Wed, 3 Mar 2021 15:11:46 -0800
-Subject: [PATCH] uvcvideo: Use auto variable to avoid range loop warnings
 
-With c++17 loop range bases are defined where copy is obvious since
-iterator returns a copy and not reference, gcc11 will emit a warning
-about this
+A range-based for loop whose range expression is an array of char
+pointers and range variable declaration is a const reference to a
+std::string creates a temporary string from the char pointer and binds
+the range variable reference to it. This creates a const reference to a
+temporary, which is valid in C++, and extends the lifetime of the
+temporary to the lifetime of the reference.
+
+However, lifetime extension in range-based for loops is considered as a
+sign of a potential issue, as a temporary is created for every
+iteration, which can be costly, and the usage of a reference in the
+range declaration doesn't make it obvious that the code isn't simply
+binding a reference to an existing object. gcc 11, with the
+-Wrange-loop-construct option, flags this:
 
 uvcvideo.cpp:432:33: error: loop variable 'name' of type 'const string&' {aka 'const std::__cxx11::basic_string<cha
 r>&'} binds to a temporary constructed from type 'const char* const' [-Werror=range-loop-construct]
 |   432 |         for (const std::string &name : { "idVendor", "idProduct" }) {
 |       |                                 ^~~~
 
-Therefore making it explicit is better
+To please the compiler, make the range variable a const char *. This may
+bring a tiny performance improvement, as the name is only used once, in
+a location where the compiler can use
+
+	operator+(const std::string &, const char *)
+
+instead of
+
+	operator+(const std::string &, const std::string &)
 
-Upstream-Status: Submitted [https://lists.libcamera.org/pipermail/libcamera-devel/2021-March/017966.html]
 Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+Use a const char * type instead of auto, and update the commit message
+accordingly.
+
+Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 ---
  src/libcamera/pipeline/uvcvideo/uvcvideo.cpp | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
-index 031f96e2..ef23ece7 100644
+index 031f96e28449..b6c6ade5ebaf 100644
 --- a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
 +++ b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
 @@ -429,7 +429,7 @@ std::string PipelineHandlerUVC::generateId(const UVCCameraData *data)
@@ -29,10 +106,12 @@ index 031f96e2..ef23ece7 100644
  	/* Creata a device ID from the USB devices vendor and product ID. */
  	std::string deviceId;
 -	for (const std::string &name : { "idVendor", "idProduct" }) {
-+	for (const auto name : { "idVendor", "idProduct" }) {
++	for (const char *name : { "idVendor", "idProduct" }) {
  		std::ifstream file(path + "/../" + name);
  
  		if (!file.is_open())
 -- 
-2.30.1
+Regards,
+
+Laurent Pinchart