greybus: loopback: Convert thread delay to microseconds

Currently the loopback code allows a delay between operations specified in
milliseconds. Having added asynchronous bi-directional support to loopback
its obvious that the delay value would be far more useful specified in
microseconds than milliseconds. So, this patch makes the necessary
conversion.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 392f9854ff5662fa3e3d169aa53d14ec399464a5..b8297d6b7e6075ce90dc9639aa389bf792b2b60e 100644 (file)
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -86,7 +86,7 @@ struct gb_loopback {
        u32 size;
        u32 iteration_max;
        u32 iteration_count;
-       int ms_wait;
+       int us_wait;
        u32 error;
        u32 requests_completed;
        u32 requests_timedout;
@@ -112,7 +112,7 @@ module_param(kfifo_depth, uint, 0444);
 /* Maximum size of any one send data buffer we support */
 #define MAX_PACKET_SIZE (PAGE_SIZE * 2)
 
-#define GB_LOOPBACK_MS_WAIT_MAX                                1000
+#define GB_LOOPBACK_US_WAIT_MAX                                1000000
 
 /* interface sysfs attributes */
 #define gb_loopback_ro_attr(field)                             \
@@ -237,8 +237,8 @@ static void gb_loopback_reset_stats(struct gb_loopback *gb);
 static void gb_loopback_check_attr(struct gb_loopback *gb,
                                   struct gb_bundle *bundle)
 {
-       if (gb->ms_wait > GB_LOOPBACK_MS_WAIT_MAX)
-               gb->ms_wait = GB_LOOPBACK_MS_WAIT_MAX;
+       if (gb->us_wait > GB_LOOPBACK_US_WAIT_MAX)
+               gb->us_wait = GB_LOOPBACK_US_WAIT_MAX;
        if (gb->size > gb_dev.size_max)
                gb->size = gb_dev.size_max;
        gb->requests_timedout = 0;
@@ -306,7 +306,7 @@ gb_dev_loopback_rw_attr(type, d);
 /* Size of transfer message payload: 0-4096 bytes */
 gb_dev_loopback_rw_attr(size, u);
 /* Time to wait between two messages: 0-1000 ms */
-gb_dev_loopback_rw_attr(ms_wait, d);
+gb_dev_loopback_rw_attr(us_wait, d);
 /* Maximum iterations for a given operation: 1-(2^32-1), 0 implies infinite */
 gb_dev_loopback_rw_attr(iteration_max, u);
 /* The current index of the for (i = 0; i < iteration_max; i++) loop */
@@ -336,7 +336,7 @@ static struct attribute *loopback_attrs[] = {
        &dev_attr_gpbridge_firmware_latency_avg.attr,
        &dev_attr_type.attr,
        &dev_attr_size.attr,
-       &dev_attr_ms_wait.attr,
+       &dev_attr_us_wait.attr,
        &dev_attr_iteration_count.attr,
        &dev_attr_iteration_max.attr,
        &dev_attr_mask.attr,
@@ -925,7 +925,7 @@ static void gb_loopback_calculate_stats(struct gb_loopback *gb)
 static int gb_loopback_fn(void *data)
 {
        int error = 0;
-       int ms_wait = 0;
+       int us_wait = 0;
        int type;
        u32 size;
        u32 send_count = 0;
@@ -951,7 +951,7 @@ static int gb_loopback_fn(void *data)
                        continue;
                }
                size = gb->size;
-               ms_wait = gb->ms_wait;
+               us_wait = gb->us_wait;
                type = gb->type;
                mutex_unlock(&gb->mutex);
 
@@ -983,8 +983,8 @@ static int gb_loopback_fn(void *data)
                        gb_loopback_calculate_stats(gb);
                }
                send_count++;
-               if (ms_wait)
-                       msleep(ms_wait);
+               if (us_wait)
+                       udelay(us_wait);
        }
        return 0;
 }