Drivers: hv: vmbus: Reduce the delay between retries in vmbus_post_msg()

kattisrinivasan · gregkh · commit f803416632b5 · 2017-04-27T09:09:32.000+02:00
commit 8de0d7e951826d7592e0ba1da655b175c4aa0923 upstream.

The current delay between retries is unnecessarily high and is negatively
affecting the time it takes to boot the system.

Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Sumit Semwal &lt;sumit.semwal@linaro.org&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
@@ -429,7 +429,7 @@ int vmbus_post_msg(void *buffer, size_t buflen)
 	union hv_connection_id conn_id;
 	int ret = 0;
 	int retries = 0;
-	u32 msec = 1;
+	u32 usec = 1;
 
 	conn_id.asu32 = 0;
 	conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
@@ -462,9 +462,9 @@ int vmbus_post_msg(void *buffer, size_t buflen)
 		}
 
 		retries++;
-		msleep(msec);
-		if (msec < 2048)
-			msec *= 2;
+		udelay(usec);
+		if (usec < 2048)
+			usec *= 2;
 	}
 	return ret;
 }

Original file line number	Diff line number	Diff line change
`@@ -429,7 +429,7 @@ int vmbus_post_msg(void *buffer, size_t buflen)`
`429`	`429`	`union hv_connection_id conn_id;`
`430`	`430`	`int ret = 0;`
`431`	`431`	`int retries = 0;`
`432`		`- u32 msec = 1;`
	`432`	`+ u32 usec = 1;`
`433`	`433`
`434`	`434`	`conn_id.asu32 = 0;`
`435`	`435`	`conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;`
`@@ -462,9 +462,9 @@ int vmbus_post_msg(void *buffer, size_t buflen)`
`462`	`462`	`}`
`463`	`463`
`464`	`464`	`retries++;`
`465`		`- msleep(msec);`
`466`		`- if (msec < 2048)`
`467`		`- msec *= 2;`
	`465`	`+ udelay(usec);`
	`466`	`+ if (usec < 2048)`
	`467`	`+ usec *= 2;`
`468`	`468`	`}`
`469`	`469`	`return ret;`
`470`	`470`	`}`