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ACPI, APEI: Cleanup alignment-aware accesses 

We do use memcpy to avoid access alignment issues between firmware and
OS. Now we can use a better and standard way to avoid this issue. While
at it, simplify some variable names to avoid the 80 cols limit and
use structure assignment instead of unnecessary memcpy. No functional
changes.

Because ERST record id cache is implemented in memory to increase the
access speed via caching ERST content we can refrain from using memcpy
there too and use regular assignment instead.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Cc: Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/1387348249-20014-1-git-send-email-gong.chen@linux.intel.com
[ Boris: massage commit message a bit. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Chen, Gong 2013-12-18 01:30:49 -05:00 committed by Borislav Petkov
parent addccbb264
commit d3ab3edc02
3 changed files with 12 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/acpi/apei/apei-base.c
View File

@ -41,6 +41,7 @@
#include <linux/rculist.h>
#include <linux/interrupt.h>
#include <linux/debugfs.h>
#include <asm/unaligned.h>
#include "apei-internal.h"
@ -567,8 +568,7 @@ static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr,
bit_offset = reg->bit_offset;
access_size_code = reg->access_width;
space_id = reg->space_id;
/* Handle possible alignment issues */
memcpy(paddr, &reg->address, sizeof(*paddr));
*paddr = get_unaligned(&reg->address);
if (!*paddr) {
pr_warning(FW_BUG APEI_PFX
"Invalid physical address in GAR [0x%llx/%u/%u/%u/%u]\n",

19
drivers/acpi/apei/einj.c
View File

@ -34,6 +34,7 @@
#include <linux/delay.h>
#include <linux/mm.h>
#include <acpi/acpi.h>
#include <asm/unaligned.h>
#include "apei-internal.h"
@ -216,7 +217,7 @@ static void check_vendor_extension(u64 paddr,
static void *einj_get_parameter_address(void)
{
int i;
u64 paddrv4 = 0, paddrv5 = 0;
u64 pa_v4 = 0, pa_v5 = 0;
struct acpi_whea_header *entry;
entry = EINJ_TAB_ENTRY(einj_tab);
@ -225,30 +226,28 @@ static void *einj_get_parameter_address(void)
entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY)
memcpy(&paddrv4, &entry->register_region.address,
sizeof(paddrv4));
pa_v4 = get_unaligned(&entry->register_region.address);
if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY)
memcpy(&paddrv5, &entry->register_region.address,
sizeof(paddrv5));
pa_v5 = get_unaligned(&entry->register_region.address);
entry++;
}
if (paddrv5) {
if (pa_v5) {
struct set_error_type_with_address *v5param;
v5param = acpi_os_map_memory(paddrv5, sizeof(*v5param));
v5param = acpi_os_map_memory(pa_v5, sizeof(*v5param));
if (v5param) {
acpi5 = 1;
check_vendor_extension(paddrv5, v5param);
check_vendor_extension(pa_v5, v5param);
return v5param;
}
}
if (param_extension && paddrv4) {
if (param_extension && pa_v4) {
struct einj_parameter *v4param;
v4param = acpi_os_map_memory(paddrv4, sizeof(*v4param));
v4param = acpi_os_map_memory(pa_v4, sizeof(*v4param));
if (!v4param)
return NULL;
if (v4param->reserved1 || v4param->reserved2) {

2
drivers/acpi/apei/erst.c
View File

@ -611,7 +611,7 @@ static void __erst_record_id_cache_compact(void)
if (entries[i] == APEI_ERST_INVALID_RECORD_ID)
continue;
if (wpos != i)
memcpy(&entries[wpos], &entries[i], sizeof(entries[i]));
entries[wpos] = entries[i];
wpos++;
}
erst_record_id_cache.len = wpos;