Input: at32psif - do not sleep in atomic context

We can't use msleep() while holding a spinlock, moreower serio's write()
method is supposed to be useable from inettrupt context. Let's do what
i8042 does and poll the status register every 50 us (with udelay).

Reported-by: Marjan Fojkar <marjan@pajkc.eu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/serio/at32psif.c b/drivers/input/serio/at32psif.c
index 50bdc00c49d7096a109a0b645370b013c43a6f07..b54452a8c77141043011c3329ea5c70c5452597f 100644 (file)
--- a/drivers/input/serio/at32psif.c
+++ b/drivers/input/serio/at32psif.c
@@ -137,7 +137,7 @@ static int psif_write(struct serio *io, unsigned char val)
        spin_lock_irqsave(&psif->lock, flags);
 
        while (!(psif_readl(psif, SR) & PSIF_BIT(TXEMPTY)) && timeout--)
-               msleep(10);
+               udelay(50);
 
        if (timeout >= 0) {
                psif_writel(psif, THR, val);