Merge tag 'v2.6.37' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / sparc / prom / printf.c

diff --git a/arch/sparc/prom/printf.c b/arch/sparc/prom/printf.c
index ca869266b9f3d0106e60d7b8c28f5cdcf614826b..d9682f06b3b056c7862ec7cda4214a95ab213a03 100644 (file)
--- a/arch/sparc/prom/printf.c
+++ b/arch/sparc/prom/printf.c
@@ -15,22 +15,45 @@
 
 #include <linux/kernel.h>
 #include <linux/compiler.h>
+#include <linux/spinlock.h>
 
 #include <asm/openprom.h>
 #include <asm/oplib.h>
 
+#define CONSOLE_WRITE_BUF_SIZE 1024
+
 static char ppbuf[1024];
+static char console_write_buf[CONSOLE_WRITE_BUF_SIZE];
+static DEFINE_RAW_SPINLOCK(console_write_lock);
 
 void notrace prom_write(const char *buf, unsigned int n)
 {
-       char ch;
+       unsigned int dest_len;
+       unsigned long flags;
+       char *dest;
+
+       dest = console_write_buf;
+       raw_spin_lock_irqsave(&console_write_lock, flags);
 
-       while (n != 0) {
-               --n;
-               if ((ch = *buf++) == '\n')
-                       prom_putchar('\r');
-               prom_putchar(ch);
+       dest_len = 0;
+       while (n-- != 0) {
+               char ch = *buf++;
+               if (ch == '\n') {
+                       *dest++ = '\r';
+                       dest_len++;
+               }
+               *dest++ = ch;
+               dest_len++;
+               if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) {
+                       prom_console_write_buf(console_write_buf, dest_len);
+                       dest = console_write_buf;
+                       dest_len = 0;
+               }
        }
+       if (dest_len)
+               prom_console_write_buf(console_write_buf, dest_len);
+
+       raw_spin_unlock_irqrestore(&console_write_lock, flags);
 }
 
 void notrace prom_printf(const char *fmt, ...)