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authorRafael J. Wysocki <rjw@sisk.pl>2011-01-19 22:27:14 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-20 18:30:17 -0800
commit2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e (patch)
tree0d7c54159ca8e9c4d4e113597d3c7c08d9f98e84 /drivers/acpi/nvs.c
parent8d99641f6c1af806cd5d9e6badce91910219a161 (diff)
downloadop-kernel-dev-2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e.zip
op-kernel-dev-2d6d9fd3a54a28c6f67f26eb6c74803307a1b11e.tar.gz
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.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/acpi/nvs.c b/drivers/acpi/nvs.c
index 54b6ab8..fa5a1df 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;
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