File s390-tools-sles12sp2-zipl-fix-failed-start-subc... of Package s390-tools

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File s390-tools-sles12sp2-zipl-fix-failed-start-subchannel.patch of Package s390-tools (Revision 4a2eab80a65890b4af79027a6d34954d)

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Subject: [PATCH] [BZ 143050] zipl/boot: fix failed start subchannel in FBA loader
From: Stefan Haberland <sth@linux.vnet.ibm.com>

Description:  zipl/boot: fix failed start subchannel in FBA loader
Symptom:      IPL of a FBA device fails with:
              Start subchannel failed
              disabled wait PSW 00020000 80000000 00000000 00004502
Problem:      The FBA loader has only a limited amount of memory to build CCW
              requests. Therefore larger I/O requests need to be split.
              This splitting was off by one leading to the fact that one CCW
              request uses memory of another data structure which in turn leads
              to corrupted data.
Solution:     Fix by correcting the split rule.
Reproduction: IPL a FBA device.
              The error might occur randomly depending on the size of the
              kernel image and offsets within it.
Upstream-ID:  -
Problem-ID:   143050

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
---
 zipl/boot/fba2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/zipl/boot/fba2.c
+++ b/zipl/boot/fba2.c
@@ -59,7 +59,7 @@ restart:
 	memset(irb, 0, sizeof(struct irb));
 	memset(&orb, 0, sizeof(struct orb));
 
-	if (blockptr->blockct > MAX_BLOCKCT) {
+	if (blockptr->blockct >= MAX_BLOCKCT) {
 		record_number = MAX_BLOCKCT - 1;
 		blockptr->blockct -= MAX_BLOCKCT;
 	} else {

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File s390-tools-sles12sp2-zipl-fix-failed-start-subchannel.patch of Package s390-tools (Revision 4a2eab80a65890b4af79027a6d34954d)

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