From: Jin Dongming Date: Wed, 29 Sep 2010 11:53:52 +0000 (+0800) Subject: ACPI, APEI, Fix acpi_pre_map() return value X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bad97c37db9c1ee36de8ac58f9f73931d15a2e94;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git ACPI, APEI, Fix acpi_pre_map() return value After we ioremap() a new region, we call __acpi_try_ioremap() to see whether another thread has already mapped the same region. This check clobbers "vaddr", so compute the return value of acpi_pre_map() using the ioremap() result "map->vaddr" instead. v2: Modified the unsuitable description of patch. v3: Removed unlikely() check and made description simpler. Signed-off-by: Jin Dongming Reviewed-by: Andi Kleen Signed-off-by: Huang Ying Signed-off-by: Len Brown --- diff --git a/drivers/acpi/atomicio.c b/drivers/acpi/atomicio.c index 8f8bd736d4f..542e5390389 100644 --- a/drivers/acpi/atomicio.c +++ b/drivers/acpi/atomicio.c @@ -142,7 +142,7 @@ static void __iomem *acpi_pre_map(phys_addr_t paddr, list_add_tail_rcu(&map->list, &acpi_iomaps); spin_unlock_irqrestore(&acpi_iomaps_lock, flags); - return vaddr + (paddr - pg_off); + return map->vaddr + (paddr - map->paddr); err_unmap: iounmap(vaddr); return NULL;