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Red Hat Bugzilla – Attachment 245981 Details for
Bug 361931
[Stratus 4.7 bug] iounmap may sleep while holding vmlist_lock, causing a deadlock.
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[patch]
Patch to fix this problem
rhel4-iounmap.patch (text/plain), 635 bytes, created by
Larry Woodman
on 2007-11-01 19:05:15 UTC
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Description:
Patch to fix this problem
Filename:
MIME Type:
Creator:
Larry Woodman
Created:
2007-11-01 19:05:15 UTC
Size:
635 bytes
patch
obsolete
>--- linux-2.6.9/arch/x86_64/mm/ioremap.c.orig >+++ linux-2.6.9/arch/x86_64/mm/ioremap.c >@@ -235,16 +235,16 @@ void iounmap(void __iomem *addr) > if (p->addr == (void *)(PAGE_MASK & (unsigned long)addr)) > break; > if (!p) { >+ write_unlock(&vmlist_lock); > printk("__iounmap: bad address %p\n", addr); >- goto out_unlock; >+ return; > } > *pprev = p->next; > unmap_vm_area(p); >+ write_unlock(&vmlist_lock); > if (p->flags >> 20) { > /* p->size includes the guard page, but cpa doesn't like that */ > ioremap_change_attr(p->phys_addr, (p->size - PAGE_SIZE), 0); > } >-out_unlock: >- write_unlock(&vmlist_lock); > kfree(p); > }
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