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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2013-04-16 14:17:15 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-04-17 14:07:38 +0200 |
| commit | b170bad40dab1a1684d629b37cb65a5281d35bd8 (patch) | |
| tree | 40f24811118d28edda9a99b40599f59913f01615 /arch/s390/pci/pci_insn.c | |
| parent | s390/pci: add exception table to load/store instructions (diff) | |
| download | linux-b170bad40dab1a1684d629b37cb65a5281d35bd8.tar.xz linux-b170bad40dab1a1684d629b37cb65a5281d35bd8.zip | |
s390/pci: do not read data after failed load
If a pci load instruction fails the content of the register where the
data is stored is possibly unchanged. Fix the inline assembly wrapper
__pcilg to not return stale data. Additionally fix the callers of this
function who access uninitialized variables.
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci/pci_insn.c')
| -rw-r--r-- | arch/s390/pci/pci_insn.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c index 4bc32f368f7d..22eeb9d7ffeb 100644 --- a/arch/s390/pci/pci_insn.c +++ b/arch/s390/pci/pci_insn.c @@ -103,7 +103,9 @@ static inline int __pcilg(u64 *data, u64 req, u64 offset, u8 *status) : "d" (__offset) : "cc"); *status = __req >> 24 & 0xff; - *data = __data; + if (!cc) + *data = __data; + return cc; } |