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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-10-29 15:04:14 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-10-29 15:05:13 +0100
commitb3dcf3de8e4d71d79235fc67b6c5def6506c27f8 (patch)
tree75761765914c8240a1497d4a72ed9eb7817efa5f
parentf8501ba77d69c88a65e4ebbe03bdc65b1edb0b86 (diff)
[S390] smp: fix sigp sense handling
sigp sense only returns the status of a cpu if it is non zero. If the status of the sensed cpu is all zeros condition code 0 (accpeted) is set and no status bits are returned. The current code however assumes that a status was returned and tests bits in it. This means uninitalized data is accessed with random results. Worst case is that the code that checks if cpu is offline on cpu hotplug assumes that the target cpu is offline while it is still running. This leads potentially to memory corruption since resources that are still needed by the target cpu will be freed and could be resused while still in use. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/smp.c1
-rw-r--r--arch/s390/kernel/swsusp_asm64.S1
2 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index c99c45b848e..93e52039321 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -76,7 +76,6 @@ static int cpu_stopped(int cpu)
__u32 status;
switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
- case sigp_order_code_accepted:
case sigp_status_stored:
/* Check for stopped and check stop state */
if (status & 0x50)
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index 0f4ef3b856d..0c26cc1898e 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -207,6 +207,7 @@ restart_suspend:
llgh %r2,0(%r1)
7:
sigp %r9,%r2,__SIGP_SENSE /* Wait for resume CPU */
+ brc 8,7b /* accepted, status 0, still running */
brc 2,7b /* busy, try again */
tmll %r9,0x40 /* Test if resume CPU is stopped */
jz 7b