From c7a7b814c9dca9ee01b38e63b4a46de87156d3b6 Mon Sep 17 00:00:00 2001 From: Tim Gardner Date: Thu, 28 Apr 2011 11:00:30 -0600 Subject: [PATCH] ioremap: Delay sanity check until after a successful mapping While tracking down the reason for an ioremap() failure I was distracted by the WARN_ONCE() in __ioremap_caller(). Performing a WARN_ONCE() sanity check before the mapping is successful seems pointless if the caller sends bad values. A case in point is when the BIOS provides erroneous screen_info values causing vesafb_probe() to request an outrageuous size. The WARN_ONCE is then wasted on bogosity. Move the warning to a point where the mapping has been successfully allocated. Addresses: http://bugs.launchpad.net/bugs/772042 Reviewed-by: Suresh Siddha Signed-off-by: Tim Gardner Link: http://lkml.kernel.org/r/4DB99D2E.9080106@canonical.com Signed-off-by: Ingo Molnar --- arch/x86/mm/ioremap.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 0369843511dc..be1ef574ce9a 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -90,13 +90,6 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr, if (is_ISA_range(phys_addr, last_addr)) return (__force void __iomem *)phys_to_virt(phys_addr); - /* - * Check if the request spans more than any BAR in the iomem resource - * tree. - */ - WARN_ONCE(iomem_map_sanity_check(phys_addr, size), - KERN_INFO "Info: mapping multiple BARs. Your kernel is fine."); - /* * Don't allow anybody to remap normal RAM that we're using.. */ @@ -170,6 +163,13 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr, ret_addr = (void __iomem *) (vaddr + offset); mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr); + /* + * Check if the request spans more than any BAR in the iomem resource + * tree. + */ + WARN_ONCE(iomem_map_sanity_check(unaligned_phys_addr, unaligned_size), + KERN_INFO "Info: mapping multiple BARs. Your kernel is fine."); + return ret_addr; err_free_area: free_vm_area(area); -- 2.20.1