net: ipa: always check for stopped channel

In gsi_channel_stop(), there's a check to see if the channel might
have entered STOPPED state since a previous call, which might have
timed out before stopping completed.

That check actually belongs in gsi_channel_stop_command(), which is
called repeatedly by gsi_channel_stop() for RX channels.

Fixes: 650d1603825d ("soc: qcom: ipa: the generic software interface")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 55226b264e3c45391d1b7b83b1e06d7ac4a37a27..ac7e5a04c8ac9f4857c9a306c2da0f142967ad27 100644 (file)
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -500,6 +500,13 @@ static int gsi_channel_stop_command(struct gsi_channel *channel)
        int ret;
 
        state = gsi_channel_state(channel);
+
+       /* Channel could have entered STOPPED state since last call
+        * if it timed out.  If so, we're done.
+        */
+       if (state == GSI_CHANNEL_STATE_STOPPED)
+               return 0;
+
        if (state != GSI_CHANNEL_STATE_STARTED &&
            state != GSI_CHANNEL_STATE_STOP_IN_PROC)
                return -EINVAL;
@@ -789,20 +796,11 @@ int gsi_channel_start(struct gsi *gsi, u32 channel_id)
 int gsi_channel_stop(struct gsi *gsi, u32 channel_id)
 {
        struct gsi_channel *channel = &gsi->channel[channel_id];
-       enum gsi_channel_state state;
        u32 retries;
        int ret;
 
        gsi_channel_freeze(channel);
 
-       /* Channel could have entered STOPPED state since last call if the
-        * STOP command timed out.  We won't stop a channel if stopping it
-        * was successful previously (so we still want the freeze above).
-        */
-       state = gsi_channel_state(channel);
-       if (state == GSI_CHANNEL_STATE_STOPPED)
-               return 0;
-
        /* RX channels might require a little time to enter STOPPED state */
        retries = channel->toward_ipa ? 0 : GSI_CHANNEL_STOP_RX_RETRIES;