From: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Date: Mon, 21 Nov 2016 12:21:59 +0000 (+0100)
Subject: s390/dasd: Always store parameter elements in an array
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=09762dcb623b5cff08c624250130cdcd389d5044;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

s390/dasd: Always store parameter elements in an array

When the DASD driver is built into the kernel, the entire comma
separated parameter list is stored as one single element in the dasd[]
array, opposed to the module build where each element is stored
separately in dasd[].
There is no point in doing so. Therefore, store each part of the list as
single elements in dasd[] as well when built into the kernel.
Also, create a define for the maximum of 256 parameters.

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index dd46e96a3034..4c8eff6b1aab 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -26,6 +26,7 @@
 /* This is ugly... */
 #define PRINTK_HEADER "dasd_devmap:"
 #define DASD_BUS_ID_SIZE 20
+#define DASD_MAX_PARAMS 256
 
 #include "dasd_int.h"
 
@@ -76,7 +77,7 @@ EXPORT_SYMBOL_GPL(dasd_nofcx);
  * it is named 'dasd' to directly be filled by insmod with the comma separated
  * strings when running as a module.
  */
-static char *dasd[256];
+static char *dasd[DASD_MAX_PARAMS];
 module_param_array(dasd, charp, NULL, S_IRUGO);
 
 /*
@@ -104,18 +105,19 @@ dasd_hash_busid(const char *bus_id)
 }
 
 #ifndef MODULE
-/*
- * The parameter parsing functions for builtin-drivers are called
- * before kmalloc works. Store the pointers to the parameters strings
- * into dasd[] for later processing.
- */
-static int __init
-dasd_call_setup(char *str)
+static int __init dasd_call_setup(char *opt)
 {
-	static int count = 0;
+	static int i;
+	char *tmp;
+
+	while (i < DASD_MAX_PARAMS) {
+		tmp = strsep(&opt, ",");
+		if (!tmp)
+			break;
+
+		dasd[i++] = tmp;
+	}
 
-	if (count < 256)
-		dasd[count++] = str;
 	return 1;
 }
 
@@ -364,10 +366,8 @@ dasd_parse_next_element( char *parsestring ) {
 /*
  * Parse parameters stored in dasd[]
  * The 'dasd=...' parameter allows to specify a comma separated list of
- * keywords and device ranges. When the dasd driver is build into the kernel,
- * the complete list will be stored as one element of the dasd[] array.
- * When the dasd driver is build as a module, then the list is broken into
- * it's elements and each dasd[] entry contains one element.
+ * keywords and device ranges. The parameters in that list will be stored as
+ * separate elementes in dasd[].
  */
 int
 dasd_parse(void)
@@ -376,7 +376,7 @@ dasd_parse(void)
 	char *parsestring;
 
 	rc = 0;
-	for (i = 0; i < 256; i++) {
+	for (i = 0; i < DASD_MAX_PARAMS; i++) {
 		if (dasd[i] == NULL)
 			break;
 		parsestring = dasd[i];