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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-01-19 22:27:14 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-20 18:30:17 -0800 |
| commit | 2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e (patch) | |
| tree | 0d7c54159ca8e9c4d4e113597d3c7c08d9f98e84 /drivers/acpi/nvs.c | |
| parent | 8d99641f6c1af806cd5d9e6badce91910219a161 (diff) | |
| download | linux-2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e.tar.bz2 | |
ACPI: Introduce acpi_os_ioremap()
Commit ca9b600be38c ("ACPI / PM: Make suspend_nvs_save() use
acpi_os_map_memory()") attempted to prevent the code in osl.c and nvs.c
from using different ioremap() variants by making the latter use
acpi_os_map_memory() for mapping the NVS pages. However, that also
requires acpi_os_unmap_memory() to be used for unmapping them, which
causes synchronize_rcu() to be executed many times in a row
unnecessarily and introduces substantial delays during resume on some
systems.
Instead of using acpi_os_map_memory() for mapping the NVS pages in nvs.c
introduce acpi_os_ioremap() calling ioremap_cache() and make the code in
both osl.c and nvs.c use it.
Reported-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/nvs.c')
| -rw-r--r-- | drivers/acpi/nvs.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/acpi/nvs.c b/drivers/acpi/nvs.c index 54b6ab8040a6..fa5a1df42b79 100644 --- a/drivers/acpi/nvs.c +++ b/drivers/acpi/nvs.c @@ -12,6 +12,7 @@ #include <linux/mm.h> #include <linux/slab.h> #include <linux/acpi.h> +#include <linux/acpi_io.h> #include <acpi/acpiosxf.h> /* @@ -80,7 +81,7 @@ void suspend_nvs_free(void) free_page((unsigned long)entry->data); entry->data = NULL; if (entry->kaddr) { - acpi_os_unmap_memory(entry->kaddr, entry->size); + iounmap(entry->kaddr); entry->kaddr = NULL; } } @@ -114,8 +115,8 @@ int suspend_nvs_save(void) list_for_each_entry(entry, &nvs_list, node) if (entry->data) { - entry->kaddr = acpi_os_map_memory(entry->phys_start, - entry->size); + entry->kaddr = acpi_os_ioremap(entry->phys_start, + entry->size); if (!entry->kaddr) { suspend_nvs_free(); return -ENOMEM; |