Re: [PATCH net-next v6 02/25] net: dsa: qca8k: use iopoll macro for qca8k_busy_wait

On Fri, May 14, 2021 at 10:59:52PM +0200, Ansuel Smith wrote:

Use iopoll macro instead of while loop.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>

This doesn't look quite right to me.

 static int
 qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
 {
-	unsigned long timeout;
-
-	timeout = jiffies + msecs_to_jiffies(20);
+	u32 val;

val is unsigned here.

+	/* Check if qca8k_read has failed for a different reason
+	 * before returning -ETIMEDOUT
+	 */
+	if (ret < 0 && val < 0)

but here you are checking it for a negative number - this will always be
false, making the conditional code unreachable. Either the test is wrong,
or the type of val is wrong. Please resolve.

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