tg3: Fix firmware event timeouts
authorMatt Carlson <mcarlson@broadcom.com>
Fri, 15 Aug 2008 21:10:04 +0000 (14:10 -0700)
committerDavid S. Miller <davem@davemloft.net>
Fri, 15 Aug 2008 21:10:04 +0000 (14:10 -0700)
commit4ba526ced990f4d61ee8d65fe8a6f0745e8e455c
tree8b20fe7ea098ff1f6d04282adc82b779e403e02b
parentbc7959b2cbb57393b625b423c73e6fd07610257f
tg3: Fix firmware event timeouts

The git commit 7c5026aa9b81dd45df8d3f4e0be73e485976a8b6 ("tg3: Add
link state reporting to UMP firmware") introduced code that waits for
previous firmware events to be serviced before attempting to submit a
new event.  Unfortunately that patch contained a bug that cause the
driver to wait 2.5 seconds, rather than 2.5 milliseconds as intended.
This patch fixes that bug.

This bug revealed that not all firmware versions service driver events
though.  Since we do not know which versions of the firmware do and don't
service these events, the driver needs some way to minimize the effects
of the delay.  This patch solves the problem by recording a jiffies
timestamp when it submits an event to the hardware.  If the jiffies
counter shows that 2.5 milliseconds have already passed, a wait is not
needed and the driver can proceed to submit a new event.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/tg3.c
drivers/net/tg3.h