[S390] sclp: Test facility list before executing a service call.

Check if a command is available before executing. Saves some
superfluous service calls that won't succeed anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/s390/char/sclp_chp.c b/drivers/s390/char/sclp_chp.c
index a66b914519b5..c68f5e7e63a0 100644
--- a/drivers/s390/char/sclp_chp.c
+++ b/drivers/s390/char/sclp_chp.c
@@ -55,6 +55,8 @@ static int do_configure(sclp_cmdw_t cmd)
         struct chp_cfg_data *data;
         int rc;
 
+        if (!SCLP_HAS_CHP_RECONFIG)
+                return -EOPNOTSUPP;
         /* Prepare sccb. */
         data = (struct chp_cfg_data *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
         if (!data)
@@ -152,6 +154,8 @@ int sclp_chp_read_info(struct sclp_chp_info *info)
         struct chp_info_data *data;
         int rc;
 
+        if (!SCLP_HAS_CHP_INFO)
+                return -EOPNOTSUPP;
         /* Prepare sccb. */
         data = (struct chp_info_data *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
         if (!data)