wl1271: fix timeout in wl1271_top_reg_read

I noticed a timeout bug in

/drivers/net/wireless/wl12xx/wl1271_spi.c

In the current code you cannot tell why you exited
the "poll for data ready" do-while loop if exiting
was done after the last possible loop.

Then timeout==0 regardless of (val & OCP_READY_MASK) or
!(val & OCP_READY_MASK), leading to possible false timeout...

Simple correction could be decreasing timeout after checking
for !(val & OCP_READY_MASK), not before

(Manually converted from email to an actual patch by me. -- JWL)

Reported-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl12xx/wl1271_spi.c b/drivers/net/wireless/wl12xx/wl1271_spi.c
index 02978a1..ee9564a 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_spi.c
+++ b/drivers/net/wireless/wl12xx/wl1271_spi.c
@@ -397,8 +397,7 @@ u16 wl1271_top_reg_read(struct wl1271 *wl, int addr)
        /* poll for data ready */
        do {
                val = wl1271_spi_read32(wl, OCP_DATA_READ);
-               timeout--;
-       } while (!(val & OCP_READY_MASK) && timeout);
+       } while (!(val & OCP_READY_MASK) && --timeout);
 
        if (!timeout) {
                wl1271_warning("Top register access timed out.");