Merge tag 'gpio-updates-for-v5.7-part4' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel

gpio updates for v5.7 part 4

- improve comments in the uapi header
- fix documentation issues
- add a warning to gpio-pl061 when the IRQ line is not configured
- allow building gpio-mxc and gpio-mxs with COMPILE_TEST enabled
- don't print an error message when an optional IRQ is missing in gpio-mvebu
- fix a potential segfault in gpio-hammer
- fix a couple typos and coding style issues in gpio tools
- provide a new flag in gpio-mmio and use it in mt7621 to fix an issue with
  the controller ignoring value setting when a GPIO is in input mode
- slightly refactor gpio_name_to_desc()

2 files changed, 20 insertions, 5 deletions

diff --git a/tools/gpio/gpio-hammer.c b/tools/gpio/gpio-hammer.c
index 0e0060a6eb34..9fd926e8cb52 100644
--- a/tools/gpio/gpio-hammer.c
+++ b/tools/gpio/gpio-hammer.c
@@ -77,7 +77,7 @@ int hammer_device(const char *device_name, unsigned int *lines, int nlines,
 
 		fprintf(stdout, "[%c] ", swirr[j]);
 		j++;
-		if (j == sizeof(swirr)-1)
+		if (j == sizeof(swirr) - 1)
 			j = 0;
 
 		fprintf(stdout, "[");
@@ -135,7 +135,14 @@ int main(int argc, char **argv)
 			device_name = optarg;
 			break;
 		case 'o':
-			lines[i] = strtoul(optarg, NULL, 10);
+			/*
+			 * Avoid overflow. Do not immediately error, we want to
+			 * be able to accurately report on the amount of times
+			 * '-o' was given to give an accurate error message
+			 */
+			if (i < GPIOHANDLES_MAX)
+				lines[i] = strtoul(optarg, NULL, 10);
+
 			i++;
 			break;
 		case '?':
@@ -143,6 +150,14 @@ int main(int argc, char **argv)
 			return -1;
 		}
 	}
+
+	if (i >= GPIOHANDLES_MAX) {
+		fprintf(stderr,
+			"Only %d occurrences of '-o' are allowed, %d were found\n",
+			GPIOHANDLES_MAX, i + 1);
+		return -1;
+	}
+
 	nlines = i;
 
 	if (!device_name || !nlines) {
diff --git a/tools/gpio/gpio-utils.c b/tools/gpio/gpio-utils.c
index 53470de6a502..06003789e7c7 100644
--- a/tools/gpio/gpio-utils.c
+++ b/tools/gpio/gpio-utils.c
@@ -17,7 +17,7 @@
 #include <linux/gpio.h>
 #include "gpio-utils.h"
 
-#define COMSUMER "gpio-utils"
+#define CONSUMER "gpio-utils"
 
 /**
  * doc: Operation of gpio
@@ -209,7 +209,7 @@ int gpiotools_gets(const char *device_name, unsigned int *lines,
 
 	ret = gpiotools_request_linehandle(device_name, lines, nlines,
 					   GPIOHANDLE_REQUEST_INPUT, data,
-					   COMSUMER);
+					   CONSUMER);
 	if (ret < 0)
 		return ret;
 
@@ -259,7 +259,7 @@ int gpiotools_sets(const char *device_name, unsigned int *lines,
 
 	ret = gpiotools_request_linehandle(device_name, lines, nlines,
 					   GPIOHANDLE_REQUEST_OUTPUT, data,
-					   COMSUMER);
+					   CONSUMER);
 	if (ret < 0)
 		return ret;