m68k: amiga: pcmcia: Replace set but not used variable by READ_ONCE()

When building with W=1:

    arch/m68k/amiga/pcmcia.c: In function ‘pcmcia_reset’:
    arch/m68k/amiga/pcmcia.c:29:23: warning: variable ‘b’ set but not used [-Wunused-but-set-variable]
       29 |         unsigned char b;
	  |                       ^

Fix this by using READ_ONCE(), and removing the variable.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/1436fa6b329c2212aaf020055afbb97e64b6f039.1694613528.git.geert@linux-m68k.org

diff --git a/arch/m68k/amiga/pcmcia.c b/arch/m68k/amiga/pcmcia.c
index 7106f0c3639bc105ca18fc2cfb777717be7727e5..63cce6b590df4dcba46248a7e1c700af19c6bc05 100644 (file)
--- a/arch/m68k/amiga/pcmcia.c
+++ b/arch/m68k/amiga/pcmcia.c
@@ -26,11 +26,10 @@ static unsigned char cfg_byte = GAYLE_CFG_0V|GAYLE_CFG_150NS;
 void pcmcia_reset(void)
 {
        unsigned long reset_start_time = jiffies;
-       unsigned char b;
 
        gayle_reset = 0x00;
        while (time_before(jiffies, reset_start_time + 1*HZ/100));
-       b = gayle_reset;
+       READ_ONCE(gayle_reset);
 }
 EXPORT_SYMBOL(pcmcia_reset);