1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/hvconsole.c b/arch/powerpc/platforms/pseries/hvconsole.c
index 138e128a3886..ba6befd96636 100644
--- a/arch/powerpc/platforms/pseries/hvconsole.c
+++ b/arch/powerpc/platforms/pseries/hvconsole.c
@@ -62,6 +62,11 @@ int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
         unsigned long *lbuf = (unsigned long *) buf;
         long ret;
 
+
+        /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
+        if (count > MAX_VIO_PUT_CHARS)
+                count = MAX_VIO_PUT_CHARS;
+
         ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
                                  lbuf[1]);
         if (ret == H_Success)