Ubuntu – Can’t install wifi driver in 12.04

I have a Dell Inspiron 15 3521 with a Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter inside. After an update the WiFi broke and I cannot seem to fix it. I tried to follow the steps from this thread where somebody has a similar problem to build the driver, but on make it gives me an error about redefinition of "kmalloc_array" even after make clean (I tried to build it previously in fact). The device is not hardware blocked, rfkill list outputs:

0: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

However, lshw -C network displays this as a result for the wifi adapter.

*-network UNCLAIMED
   description: Network controller
   product: QCA9565 / AR9565 Wireless Network Adapter
   vendor: Qualcomm Atheros
   physical id: 0
   bus info: pci@0000:02:00.0
   version: 01
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list
   configuration: latency=0
   resources: memory:c0500000-c057ffff memory:afb00000-afb0ffff

and there is no driver=ath9k or whatever it must be.

Edit: lsmod |grep mac80211 gives the following result:

mac80211       557654 1 ath9k
cfg80211       219204 3 ath9k,mac80211,ath
compat          20099 9 ath9k,mac80211,ath9k_common,ath9k_hw,cfg80211,rfcomm,bnep,btusb,bluetooth

How can I fix this?

Edit2: uname -r outputs

3.2.0-56-generic

lspci -nn |grep 0280 outputs

02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)

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