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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-07-10 11:24:10 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-07-10 11:24:43 +0200 |
| commit | 83119ad4a1ceacd99f380086c2855ae2c4268afc (patch) | |
| tree | 6da1d5cdba6e5bcd8fcdf5332700e8353b4e79a8 /drivers/s390/char/sclp_chp.c | |
| parent | 05dd25307ca67cbfa0207bbba2e6c79fa97d125b (diff) | |
| download | linux-83119ad4a1ceacd99f380086c2855ae2c4268afc.tar.gz linux-83119ad4a1ceacd99f380086c2855ae2c4268afc.tar.bz2 linux-83119ad4a1ceacd99f380086c2855ae2c4268afc.zip | |
[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>
Diffstat (limited to 'drivers/s390/char/sclp_chp.c')
| -rw-r--r-- | drivers/s390/char/sclp_chp.c | 4 |
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) |