wimax/i2400m/sdio: clear the INTR status bit after reading size

In order to avoid issues during high-load traffic, the interrupt
status register has to be cleared ONLY after the RX size is read.

Signed-off-by: Cindy H Kao <cindy.h.kao@intel.com>
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

diff --git a/drivers/net/wimax/i2400m/sdio-rx.c b/drivers/net/wimax/i2400m/sdio-rx.c
index f6ca51a..1c90469 100644 (file)
--- a/drivers/net/wimax/i2400m/sdio-rx.c
+++ b/drivers/net/wimax/i2400m/sdio-rx.c
@@ -138,6 +138,11 @@ void i2400ms_rx(struct i2400ms *i2400ms)
                ret = rx_size;
                goto error_get_size;
        }
+       /*
+        * Hardware quirk: make sure to clear the INTR status register
+        * AFTER getting the data transfer size.
+        */
+       sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
 
        ret = -ENOMEM;
        skb = alloc_skb(rx_size, GFP_ATOMIC);
@@ -209,7 +214,6 @@ void i2400ms_irq(struct sdio_func *func)
                dev_err(dev, "RX: BUG? got IRQ but no interrupt ready?\n");
                goto error_no_irq;
        }
-       sdio_writeb(func, 1, I2400MS_INTR_CLEAR_ADDR, &ret);
        i2400ms_rx(i2400ms);
 error_no_irq:
        d_fnend(6, dev, "(i2400ms %p) = void\n", i2400ms);