[S390] kernel: Convert upper case scpdata to lower case

If the CP SET LOADDEV on the 3215 console has been used to specify
SCPdata, all data is converted to upper case letters.

When scpdata contains upper case letters only, convert all letters
to lower case.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 04451a5e3c15..ee57a42e6e93 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -340,19 +340,28 @@ size_t reipl_append_ascii_scpdata(char *dest, size_t size,
 {
 	size_t count;
 	size_t i;
+	int has_lowercase;
 
 	count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
 					     ipb->ipl_info.fcp.scp_data_len));
 	if (!count)
 		goto out;
 
-	for (i = 0; i < count; i++)
+	has_lowercase = 0;
+	for (i = 0; i < count; i++) {
 		if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
 			count = 0;
 			goto out;
 		}
+		if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
+			has_lowercase = 1;
+	}
 
-	memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
+	if (has_lowercase)
+		memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
+	else
+		for (i = 0; i < count; i++)
+			dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
 out:
 	dest[count] = '\0';
 	return count;