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x86: check for ioremap() failure in copy_oldmem_page()

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Add a check for ioremap() failure in copy_oldmem_page().
This patch also includes small coding style fixes.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Akinobu Mita 2008-09-21 23:27:13 +09:00 committed by Ingo Molnar
parent 72d31053f6
commit af2d237bf5
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/crash_dump_64.c
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@ -33,14 +33,16 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
return 0;
vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
if (userbuf) {
if (copy_to_user(buf, (vaddr + offset), csize)) {
if (copy_to_user(buf, vaddr + offset, csize)) {
iounmap(vaddr);
return -EFAULT;
}
} else
memcpy(buf, (vaddr + offset), csize);
memcpy(buf, vaddr + offset, csize);
iounmap(vaddr);
return csize;