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efi/apple-properties: Use memremap() instead of ioremap()

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The memory we are accessing through virtual address has no IO side
effects. Moreover, for IO memory we have to use special accessors,
which we don't use.

Due to above, convert the driver to use memremap() instead of ioremap().

Tested-by: Lukas Wunner <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Andy Shevchenko 2018-03-08 08:00:19 +00:00 • committed by Ingo Molnar
commit 44612d7e0c
1 changed files with 6 additions and 5 deletions
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11
drivers/firmware/efi/apple-properties.c
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@ -19,6 +19,7 @@
#include <linux/bootmem.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/property.h>
#include <linux/slab.h>
@ -189,7 +190,7 @@ static int __init map_properties(void)
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
data = ioremap(pa_data, sizeof(*data));
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
if (!data) {
pr_err("cannot map setup_data header\n");
return -ENOMEM;
@ -197,14 +198,14 @@ static int __init map_properties(void)
if (data->type != SETUP_APPLE_PROPERTIES) {
pa_data = data->next;
iounmap(data);
memunmap(data);
continue;
}
data_len = data->len;
iounmap(data);
memunmap(data);
data = ioremap(pa_data, sizeof(*data) + data_len);
data = memremap(pa_data, sizeof(*data) + data_len, MEMREMAP_WB);
if (!data) {
pr_err("cannot map setup_data payload\n");
return -ENOMEM;
@ -229,7 +230,7 @@ static int __init map_properties(void)
* to avoid breaking the chain of ->next pointers.
*/
data->len = 0;
iounmap(data);
memunmap(data);
free_bootmem_late(pa_data + sizeof(*data), data_len);
return ret;