[PATCH] powerpc/pseries/lparcfg: Replace deprecated strcpy in parse_system_parameter_string

[Thorsten Blum]

strcpy() is deprecated; use strscpy() instead. Use the return value of
strscpy() instead of calling strlen() again, and ignore any potential
string truncation since both strings are much shorter than the buffer
size SPLPAR_MAXLENGTH.

Change both if conditions to silence the following checkpatch warnings:

  Comparisons should place the constant on the right side of the test

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Thorsten Blum <thorsten.blum at linux.dev>
---
 arch/powerpc/platforms/pseries/lparcfg.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
index cc22924f159f..533a6edf2e03 100644
--- a/arch/powerpc/platforms/pseries/lparcfg.c
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -22,6 +22,7 @@
 #include <asm/papr-sysparm.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/hugetlb.h>
 #include <asm/lppaca.h>
@@ -420,17 +421,18 @@ static void parse_system_parameter_string(struct seq_file *m)
 				w_idx = 0;
 			} else if (local_buffer[idx] == '=') {
 				/* code here to replace workbuffer contents
-				   with different keyword strings */
-				if (0 == strcmp(workbuffer, "MaxEntCap")) {
-					strcpy(workbuffer,
-					       "partition_max_entitled_capacity");
-					w_idx = strlen(workbuffer);
-				}
-				if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
-					strcpy(workbuffer,
-					       "system_potential_processors");
-					w_idx = strlen(workbuffer);
-				}
+				 * with different keyword strings. Truncation
+				 * by strscpy is deliberately ignored because
+				 * SPLPAR_MAXLENGTH >= maximum string size.
+				 */
+				if (!strcmp(workbuffer, "MaxEntCap"))
+					w_idx = strscpy(workbuffer,
+							"partition_max_entitled_capacity",
+							SPLPAR_MAXLENGTH);
+				if (!strcmp(workbuffer, "MaxPlatProcs"))
+					w_idx = strscpy(workbuffer,
+							"system_potential_processors",
+							SPLPAR_MAXLENGTH);
 			}
 		}
 		kfree(workbuffer);
-- 
2.51.0