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Commit 76ef964c authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
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[S390] zcore: Fix reipl device detection


The reipl device information is passed from the kernel to zfcpdump
using a pointer in the lowcore (0xe00) that points to the reipl
information Currently if that pointer is not zero, we copy the reipl
information. If the pointer is not initialized and points outside
the accessible memory, it can happen that the memory copy fails.
In that case we currently stop the initialization of zcore which leads
to a failing kernel dump. The correct behavior is to disable the reipl
after dump and continue with zcore intialization.

Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 157a1a27
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......@@ -638,11 +638,7 @@ static int __init zcore_reipl_init(void)
rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
else
rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
if (rc) {
free_page((unsigned long) ipl_block);
return rc;
}
if (csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
ipib_info.checksum) {
TRACE("Checksum does not match\n");
free_page((unsigned long) ipl_block);
......
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