On Mon, Feb 15, 2016 at 12:32:32PM +0100, Ard Biesheuvel wrote:
> On ARM and arm64, ioremap() and memremap() are not interchangeable like
> on x86, and the use of ioremap() on ordinary RAM is typically flagged
> as an error if the memory region being mapped is also covered by the
> linear mapping, since that would lead to aliases with conflicting
> cacheability attributes.
>
> Since what we are dealing with is not an I/O region with side effects,
> using ioremap() here is arguably incorrect anyway, so let's replace
> it with memremap instead. Also add a missing unmap on the success path,
> and drop a memblock_remove() call which does not belong here, this far
> into the boot sequence.
>
> Cc: Peter Jones <pjones@xxxxxxxxxx>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Works on my test box and appears to be correct:
Tested-by: Peter Jones <pjones@xxxxxxxxxx>
Acked-by: Peter Jones <pjones@xxxxxxxxxx>
> ---
> drivers/firmware/efi/esrt.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
> index 22c5285f7705..f096a0a26dbd 100644
> --- a/drivers/firmware/efi/esrt.c
> +++ b/drivers/firmware/efi/esrt.c
> @@ -16,6 +16,7 @@
> #include <linux/device.h>
> #include <linux/efi.h>
> #include <linux/init.h>
> +#include <linux/io.h>
> #include <linux/kernel.h>
> #include <linux/kobject.h>
> #include <linux/list.h>
> @@ -385,15 +386,15 @@ static void cleanup_entry_list(void)
> static int __init esrt_sysfs_init(void)
> {
> int error;
> - struct efi_system_resource_table __iomem *ioesrt;
> + struct efi_system_resource_table *memesrt;
>
> pr_debug("esrt-sysfs: loading.\n");
> if (!esrt_data || !esrt_data_size)
> return -ENOSYS;
>
> - ioesrt = ioremap(esrt_data, esrt_data_size);
> - if (!ioesrt) {
> - pr_err("ioremap(%pa, %zu) failed.\n", &esrt_data,
> + memesrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB);
> + if (!memesrt) {
> + pr_err("memremap(%pa, %zu, MEMREMAP_WB) failed.\n", &esrt_data,
> esrt_data_size);
> return -ENOMEM;
> }
> @@ -401,11 +402,12 @@ static int __init esrt_sysfs_init(void)
> esrt = kmalloc(esrt_data_size, GFP_KERNEL);
> if (!esrt) {
> pr_err("kmalloc failed. (wanted %zu bytes)\n", esrt_data_size);
> - iounmap(ioesrt);
> + memunmap(memesrt);
> return -ENOMEM;
> }
>
> - memcpy_fromio(esrt, ioesrt, esrt_data_size);
> + memcpy(esrt, memesrt, esrt_data_size);
> + memunmap(memesrt);
>
> esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
> if (!esrt_kobj) {
> @@ -432,8 +434,6 @@ static int __init esrt_sysfs_init(void)
> if (error)
> goto err_cleanup_list;
>
> - memblock_remove(esrt_data, esrt_data_size);
> -
> pr_debug("esrt-sysfs: loaded.\n");
>
> return 0;
> --
> 2.5.0
>
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