It means that the Marvell wifi driver exports data through /proc/net/wireless which is deprecated. It's not an error, just a warning.
pcmcia: request for exclusive IRQ could not be fulfilled.
pcmcia: the driver needs updating to supported shared IRQ lines.
After calling wlan_add_card function
After register driver
NET: Registered protocol family 17
mwlan0 (WE) : Driver using old /proc/net/wireless support, please fix driver !
What does the last line mean?