net: ipa: count actual work done in gsi_channel_poll()

There is an off-by-one problem in gsi_channel_poll().  The count of
transactions completed is incremented each time through the loop
*before* determining whether there is any more work to do.  As a
result, if we exit the loop early the counter its value is one more
than the number of transactions actually processed.

Instead, increment the count after processing, to ensure it reflects
the number of processed transactions.  The result is more naturally
described as a for loop rather than a while loop, so change that.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 5b29f7d9d6ac1f09f39338bbbaf31c0b244c7ddd..56a5eb61b20c4b1bd976baeda65cf12d51a1bea8 100644 (file)
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1543,13 +1543,12 @@ static struct gsi_trans *gsi_channel_poll_one(struct gsi_channel *channel)
 static int gsi_channel_poll(struct napi_struct *napi, int budget)
 {
        struct gsi_channel *channel;
-       int count = 0;
+       int count;
 
        channel = container_of(napi, struct gsi_channel, napi);
-       while (count < budget) {
+       for (count = 0; count < budget; count++) {
                struct gsi_trans *trans;
 
-               count++;
                trans = gsi_channel_poll_one(channel);
                if (!trans)
                        break;