On 12/30/2017 05:08 AM, Jia-Ju Bai wrote:

b43_radio_2057_init_post is not called in an interrupt handler
nor holding a spinlock.
The function mdelay in it can be replaced with msleep, to reduce busy wait.

Signed-off-by: Jia-Ju Bai <redacted>

checkpatch.pl reports the following warning for this patch:

WARNING: msleep < 20ms can sleep for up to 20ms; see 
Documentation/timers/timers-howto.txt
#26: FILE: drivers/net/wireless/broadcom/b43/phy_n.c:1034:
+       msleep(2);

total: 0 errors, 1 warnings, 0 checks, 8 lines checked

Have you tested to verify that a sleep as long as 20 ms will not cause problems? 
The referenced document suggests a usleep_range() call.

In general, delay changes should never be proposed without testing.

Larry