Unable to connect to wireless network after upgrading kernel (3.5.0-46) 12.04 64bits

[Murasaki_san]

Hello! I've been using Ubuntu for a while, but I don't know much about IT, so please bear with me.

I have a Dell Inspiron 3521 with Ubuntu 12.04. Today I installed the recommended update which included the version 3.5.0-46 of the kernel. After rebooting, the wireless connection was lost.
Went to Terminal, typedrfkill list all and it did't return any "wireless network" (the bluetooth does appear though). Then I tried lshw -C network and this is what came up:

*-network               
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 05
       serial: 74:86:7a:56:c5:26
       size: 10Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:41 ioport:2000(size=256) memory:c0404000-c0404fff memory:c0400000-c0403fff
  *-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

I noticed the "UNCLAIMED" on the second part of the result, so my guess is that there is an issue with drivers and that's why is not working. (I had to install some kind of special patch for the kernel when I first installed this version of Ubuntu on my laptop a couple of months ago because it had the same problem).

If I log in using the previous version of the kernel everything is fine, so now I have 2 questions:

- Should I just keep using the old version of the kernel and forget about it?
- Is it better to fix it right away, and if so, where can I find the solution? (I've been looking for answers but I couldn't find what I needed)

Thanks in advance for your help!