busybox: add 1.20.0 patch for mdev and update buildsys patch

--- busybox-1.20.0/archival/libarchive/Kbuild.src

+++ busybox-1.20.0-buildsys/archival/libarchive/Kbuild.src

@@ -45,7 +45,7 @@ lib-$(CONFIG_UNXZ)

 lib-$(CONFIG_CPIO)                      += get_header_cpio.o

 lib-$(CONFIG_DPKG)                      += $(DPKG_FILES)

 lib-$(CONFIG_DPKG_DEB)                  += $(DPKG_FILES)

-lib-$(CONFIG_GUNZIP)                    += decompress_gunzip.o

+lib-$(CONFIG_GUNZIP)                    += open_transformer.o decompress_gunzip.o

 lib-$(CONFIG_RPM2CPIO)                  += decompress_gunzip.o get_header_cpio.o

 lib-$(CONFIG_RPM)                       += open_transformer.o decompress_gunzip.o get_header_cpio.o

 lib-$(CONFIG_TAR)                       += get_header_tar.o

@@ -60,7 +60,7 @@ lib-$(CONFIG_FEATURE_SEAMLESS_GZ)

 lib-$(CONFIG_FEATURE_SEAMLESS_BZ2)      += open_transformer.o decompress_bunzip2.o

 lib-$(CONFIG_FEATURE_SEAMLESS_LZMA)     += open_transformer.o decompress_unlzma.o

--- busybox-1.20.0/util-linux/mdev.c

+++ busybox-1.20.0-mdev/util-linux/mdev.c

@@ -661,37 +661,45 @@ static int FAST_FUNC dirAction(const cha

 static void load_firmware(const char *firmware, const char *sysfs_path)

 {

 	int cnt;

-	int firmware_fd, loading_fd, data_fd;

+	int firmware_fd, loading_fd;

 	/* check for /lib/firmware/$FIRMWARE */

 	xchdir("/lib/firmware");

-	firmware_fd = xopen(firmware, O_RDONLY);

-

-	/* in case we goto out ... */

-	data_fd = -1;

+	firmware_fd = open(firmware, O_RDONLY); /* can fail */

 	/* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */

 	xchdir(sysfs_path);

 	for (cnt = 0; cnt < 30; ++cnt) {

 		loading_fd = open("loading", O_WRONLY);

-		if (loading_fd != -1)

+		if (loading_fd >= 0)

 			goto loading;

 		sleep(1);

 	}

 	goto out;

  loading:

-	/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */

-	if (full_write(loading_fd, "1", 1) != 1)

-		goto out;

-

-	/* load firmware into /sys/$DEVPATH/data */

-	data_fd = open("data", O_WRONLY);

-	if (data_fd == -1)

-		goto out;

-	cnt = bb_copyfd_eof(firmware_fd, data_fd);

+	cnt = 0;

+	if (firmware_fd >= 0) {

+		int data_fd;

+

+		/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */

+		if (full_write(loading_fd, "1", 1) != 1)

+			goto out;

+

+		/* load firmware into /sys/$DEVPATH/data */

+		data_fd = open("data", O_WRONLY);

+		if (data_fd < 0)

+			goto out;

+		cnt = bb_copyfd_eof(firmware_fd, data_fd);

+		if (ENABLE_FEATURE_CLEAN_UP)

+			close(data_fd);

+	}

-	/* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */

+	/* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading"

+	 * Note: we emit -1 if firmware file wasn't found.

+	 * There are cases when otherwise kernel would wait for minutes

+	 * before timing out.

+	 */

 	if (cnt > 0)

 		full_write(loading_fd, "0", 1);

 	else

@@ -701,7 +709,6 @@ static void load_firmware(const char *fi

 	if (ENABLE_FEATURE_CLEAN_UP) {

 		close(firmware_fd);

 		close(loading_fd);

-		close(data_fd);

 	}

 }