From: Pawel Moll Date: Thu, 26 Jan 2012 10:47:11 +0000 (+0100) Subject: ARM: 7304/1: ioremap: fix boundary check when reusing static mapping X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3c424f359898aff48c3d5bed608ac706f8a528c3;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git ARM: 7304/1: ioremap: fix boundary check when reusing static mapping Since commit 576d2f2525612ecb5af029a76f21f22a3b82563d "ARM: add generic ioremap optimization by reusing static mappings" ioremap() is trying to reuse existing static mapping when possible. The condition checking boundaries of the requested and existing mappings didn't take in-page offset into consideration though, which lead to obscure and hard to debug problems when requested mapping crossed end of the static one. Signed-off-by: Pawel Moll Acked-by: Nicolas Pitre Signed-off-by: Russell King --- diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 80632e8d753..ba159370fa5 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -225,7 +225,8 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn, if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype)) continue; if (__phys_to_pfn(area->phys_addr) > pfn || - __pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1) + __pfn_to_phys(pfn) + offset + size-1 > + area->phys_addr + area->size-1) continue; /* we can drop the lock here as we know *area is static */ read_unlock(&vmlist_lock);