From 24f11ec001920f1cfaeeed8e8b55725d900bbb56 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 25 Jan 2009 17:36:34 +0000 Subject: [PATCH] [ARM] fix section-based ioremap Tomi Valkeinen reports: Running with latest linux-omap kernel on OMAP3 SDP board, I have problem with iounmap(). It looks like iounmap() does not properly free large areas. Below is a test which fails for me in 6-7 loops. for (i = 0; i < 200; ++i) { vaddr = ioremap(paddr, size); if (!vaddr) { printk("couldn't ioremap\n"); break; } iounmap(vaddr); } The changes to vmalloc.c weren't reflected in the ARM ioremap implementation. Turns out the fix is rather simple. Tested-by: Tomi Valkeinen Tested-by: Matt Gerassimoff Signed-off-by: Russell King --- arch/arm/mm/ioremap.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 18373f73f2f..9f88dd3be60 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -138,7 +138,7 @@ void __check_kvm_seq(struct mm_struct *mm) */ static void unmap_area_sections(unsigned long virt, unsigned long size) { - unsigned long addr = virt, end = virt + (size & ~SZ_1M); + unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1)); pgd_t *pgd; flush_cache_vunmap(addr, end); @@ -337,10 +337,7 @@ void __iounmap(volatile void __iomem *io_addr) void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); #ifndef CONFIG_SMP struct vm_struct **p, *tmp; -#endif - unsigned int section_mapping = 0; -#ifndef CONFIG_SMP /* * If this is a section based mapping we need to handle it * specially as the VM subsystem does not know how to handle @@ -352,11 +349,8 @@ void __iounmap(volatile void __iomem *io_addr) for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) { if ((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) { if (tmp->flags & VM_ARM_SECTION_MAPPING) { - *p = tmp->next; unmap_area_sections((unsigned long)tmp->addr, tmp->size); - kfree(tmp); - section_mapping = 1; } break; } @@ -364,7 +358,6 @@ void __iounmap(volatile void __iomem *io_addr) write_unlock(&vmlist_lock); #endif - if (!section_mapping) - vunmap(addr); + vunmap(addr); } EXPORT_SYMBOL(__iounmap); -- 2.41.1