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authorMichael Holzheu <holzheu@de.ibm.com>2006-12-15 17:18:22 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-12-15 17:18:22 +0100
commita45e14148fb34175cba042df8979e7982758635f (patch)
tree10add976d1291f4172e95aea60e2c44594b9813d /arch/s390/kernel/ipl.c
parentb3c14d0bfd1739b930f26df90552a4d8cdcca0a6 (diff)
downloadop-kernel-dev-a45e14148fb34175cba042df8979e7982758635f.zip
op-kernel-dev-a45e14148fb34175cba042df8979e7982758635f.tar.gz
[S390] Fix reboot hang on LPARs
Reboot hangs on LPARs without diag308 support. The reason for this is, that before the reboot is done, the channel subsystem is shut down. During the reset on each possible subchannel a "store subchannel" is done. This operation can end in a program check interruption, if the specified subchannel set is not implemented by the hardware. During the reset, currently we do not have a program check handler, which leads to the described kernel bug. We install now a new program check handler for the reboot code to fix this problem. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ipl.c')
-rw-r--r--arch/s390/kernel/ipl.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index a36bea1..d2e6a0a 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1037,13 +1037,15 @@ static void do_reset_calls(void)
}
extern void reset_mcck_handler(void);
+extern void reset_pgm_handler(void);
void s390_reset_system(void)
{
struct _lowcore *lc;
- /* Stack for interrupt/machine check handler */
lc = (struct _lowcore *)(unsigned long) store_prefix();
+
+ /* Stack for interrupt/machine check handler */
lc->panic_stack = S390_lowcore.panic_stack;
/* Disable prefixing */
@@ -1056,5 +1058,11 @@ void s390_reset_system(void)
S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
S390_lowcore.mcck_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler;
+
+ /* Set new program check handler */
+ S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
+ S390_lowcore.program_new_psw.addr =
+ PSW_ADDR_AMODE | (unsigned long) &reset_pgm_handler;
+
do_reset_calls();
}
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