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efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()

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We can use the new efi_mem_reserve() API to mark the ESRT table as
reserved forever and save ourselves the trouble of copying the data
out into a kmalloc buffer.

The added advantage is that now the ESRT driver will work across
kexec reboot.

Tested-by: Dave Young <dyoung@redhat.com> [kexec/kdump]
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [arm]
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Peter Jones <pjones@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Matt Fleming 2016-03-01 23:08:03 +00:00
parent 31ce8cc681
commit 8e80632fb2
1 changed files with 4 additions and 16 deletions
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20
drivers/firmware/efi/esrt.c
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@ -235,7 +235,7 @@ static struct attribute_group esrt_attr_group = {
};
/*
* remap the table, copy it to kmalloced pages, and unmap it.
* remap the table, validate it, mark it reserved and unmap it.
*/
void __init efi_esrt_init(void)
{
@ -335,7 +335,7 @@ void __init efi_esrt_init(void)
end = esrt_data + size;
pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end);
memblock_reserve(esrt_data, esrt_data_size);
efi_mem_reserve(esrt_data, esrt_data_size);
pr_debug("esrt-init: loaded.\n");
err_memunmap:
@ -382,28 +382,18 @@ static void cleanup_entry_list(void)
static int __init esrt_sysfs_init(void)
{
int error;
struct efi_system_resource_table __iomem *ioesrt;
pr_debug("esrt-sysfs: loading.\n");
if (!esrt_data || !esrt_data_size)
return -ENOSYS;
ioesrt = ioremap(esrt_data, esrt_data_size);
if (!ioesrt) {
esrt = ioremap(esrt_data, esrt_data_size);
if (!esrt) {
pr_err("ioremap(%pa, %zu) failed.\n", &esrt_data,
esrt_data_size);
return -ENOMEM;
}
esrt = kmalloc(esrt_data_size, GFP_KERNEL);
if (!esrt) {
pr_err("kmalloc failed. (wanted %zu bytes)\n", esrt_data_size);
iounmap(ioesrt);
return -ENOMEM;
}
memcpy_fromio(esrt, ioesrt, esrt_data_size);
esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
if (!esrt_kobj) {
pr_err("Firmware table registration failed.\n");
@ -429,8 +419,6 @@ 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;