diff options
| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2011-04-24 23:40:51 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2011-07-30 21:21:38 +0200 |
| commit | cab49bc95d848a85d7108f896f6d21283f25f54c (patch) | |
| tree | d3cf9c77dddce64dc238e7378cd924717a8d02db /arch | |
| parent | 3a17bfa4fb37e7f8e06ef31feafec559bd4c6699 (diff) | |
m68k/amiga: Chip RAM - Change chipavail to an atomic_t
While the core resource handling code is safe, our global counter must
still be protected against concurrent modifications.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/m68k/amiga/chipram.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/m68k/amiga/chipram.c b/arch/m68k/amiga/chipram.c index e5a8dbc9aba..c3fe45125f5 100644 --- a/arch/m68k/amiga/chipram.c +++ b/arch/m68k/amiga/chipram.c @@ -16,6 +16,7 @@ #include <linux/string.h> #include <linux/module.h> +#include <asm/atomic.h> #include <asm/page.h> #include <asm/amigahw.h> @@ -25,7 +26,7 @@ EXPORT_SYMBOL(amiga_chip_size); static struct resource chipram_res = { .name = "Chip RAM", .start = CHIP_PHYSADDR }; -static unsigned long chipavail; +static atomic_t chipavail; void __init amiga_chip_init(void) @@ -36,7 +37,7 @@ void __init amiga_chip_init(void) chipram_res.end = amiga_chip_size-1; request_resource(&iomem_resource, &chipram_res); - chipavail = amiga_chip_size; + atomic_set(&chipavail, amiga_chip_size); } @@ -84,7 +85,7 @@ void *amiga_chip_alloc_res(unsigned long size, struct resource *res) return NULL; } - chipavail -= size; + atomic_sub(size, &chipavail); pr_debug("amiga_chip_alloc_res: returning %pR\n", res); return (void *)ZTWO_VADDR(res->start); } @@ -101,7 +102,7 @@ void amiga_chip_free(void *ptr) *p = res->sibling; size = res->end-start; pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr); - chipavail += size; + atomic_add(size, &chipavail); kfree(res); return; } @@ -113,8 +114,10 @@ EXPORT_SYMBOL(amiga_chip_free); unsigned long amiga_chip_avail(void) { - pr_debug("amiga_chip_avail : %lu bytes\n", chipavail); - return chipavail; + unsigned long n = atomic_read(&chipavail); + + pr_debug("amiga_chip_avail : %lu bytes\n", n); + return n; } EXPORT_SYMBOL(amiga_chip_avail); |