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| author |   Matt Fleming <matt@codeblueprint.co.uk> | 2016-03-01 23:08:03 +0000 |
|---|---|---|
| committer | Matt Fleming <matt@codeblueprint.co.uk> | 2016-09-09 16:08:37 +0100 |
| commit | 8e80632fb23f021ce5a6957f2edcdae4645a7030 (patch) | |
| tree | 02613c2a9158598641fb36dbf8bb12eaa60cca10 /drivers/firmware | |
| parent | efi/runtime-map: Use efi.memmap directly instead of a copy (diff) | |
| download | linux-dev-8e80632fb23f021ce5a6957f2edcdae4645a7030.tar.xz linux-dev-8e80632fb23f021ce5a6957f2edcdae4645a7030.zip | |
efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()
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>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/esrt.c | 20 |
1 files changed, 4 insertions, 16 deletions
diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c index 75feb3f5829b..b93cd11f9bcc 100644 --- a/drivers/firmware/efi/esrt.c +++ b/drivers/firmware/efi/esrt.c @@ -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; |