rtlwifi: Fix kernel panic resulting from RX buffer allocation failure
To handle amsdu_8k capability, the PCI routine of this driver must allocate receive buffers of order 2. Under heavy load, this causes fragmentation of memory. The present code releases the current buffer before checking to see if a new one is availble. Recovery from allocation failures is not possible, which results in kernel panics. The fix is to reorder the code to check that a new buffer can be allocated before the old one is released. If not possible, the received frame is dropped and the old one is reused. Without this change, it is impossible to transfer a 2 GB file without a kernel panic. Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net> Cc: Stable <stable@vger.kernel.org> [2.6.{37,38,39}] Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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