forked from pool/s390-tools
36 lines
1.4 KiB
Diff
36 lines
1.4 KiB
Diff
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Subject: [PATCH] [BZ 143050] zipl/boot: fix failed start subchannel in FBA loader
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From: Stefan Haberland <sth@linux.vnet.ibm.com>
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Description: zipl/boot: fix failed start subchannel in FBA loader
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Symptom: IPL of a FBA device fails with:
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Start subchannel failed
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disabled wait PSW 00020000 80000000 00000000 00004502
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Problem: The FBA loader has only a limited amount of memory to build CCW
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requests. Therefore larger I/O requests need to be split.
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This splitting was off by one leading to the fact that one CCW
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request uses memory of another data structure which in turn leads
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to corrupted data.
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Solution: Fix by correcting the split rule.
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Reproduction: IPL a FBA device.
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The error might occur randomly depending on the size of the
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kernel image and offsets within it.
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Upstream-ID: -
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Problem-ID: 143050
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Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
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---
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zipl/boot/fba2.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/zipl/boot/fba2.c
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+++ b/zipl/boot/fba2.c
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@@ -59,7 +59,7 @@ restart:
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memset(irb, 0, sizeof(struct irb));
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memset(&orb, 0, sizeof(struct orb));
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- if (blockptr->blockct > MAX_BLOCKCT) {
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+ if (blockptr->blockct >= MAX_BLOCKCT) {
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record_number = MAX_BLOCKCT - 1;
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blockptr->blockct -= MAX_BLOCKCT;
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} else {
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