• Iyappan Subramanian's avatar
    drivers: net: xgene: fix: Use separate resources · bdd330f0
    Iyappan Subramanian authored
    
    
    This patch fixes the following kernel crash during SGMII based 1GbE probe.
    
    	BUG: Bad page state in process swapper/0  pfn:40fe6ad
    	page:ffffffbee37a75d8 count:-1 mapcount:0 mapping:          (null) index:0x0
    	flags: 0x0()
    	page dumped because: nonzero _count
    	Modules linked in:
    	CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.17.0+ #7
    	Call trace:
    	[<ffffffc000087fa0>] dump_backtrace+0x0/0x12c
    	[<ffffffc0000880dc>] show_stack+0x10/0x1c
    	[<ffffffc0004d981c>] dump_stack+0x74/0xc4
    	[<ffffffc00012fe70>] bad_page+0xd8/0x128
    	[<ffffffc000133000>] get_page_from_freelist+0x4b8/0x640
    	[<ffffffc000133260>] __alloc_pages_nodemask+0xd8/0x834
    	[<ffffffc0004194f8>] __netdev_alloc_frag+0x124/0x1b8
    	[<ffffffc00041bfdc>] __netdev_alloc_skb+0x90/0x10c
    	[<ffffffc00039ff30>] xgene_enet_refill_bufpool+0x11c/0x280
    	[<ffffffc0003a11a4>] xgene_enet_process_ring+0x168/0x340
    	[<ffffffc0003a1498>] xgene_enet_napi+0x1c/0x50
    	[<ffffffc00042b454>] net_rx_action+0xc8/0x18c
    	[<ffffffc0000b0880>] __do_softirq+0x114/0x24c
    	[<ffffffc0000b0c34>] irq_exit+0x94/0xc8
    	[<ffffffc0000e68a0>] __handle_domain_irq+0x8c/0xf4
    	[<ffffffc000081288>] gic_handle_irq+0x30/0x7c
    
    This was due to hardware resource sharing conflict with the firmware. This
    patch fixes this crash by using resources (descriptor ring, prefetch buffer)
    that are not shared.
    
    Signed-off-by: default avatarIyappan Subramanian <isubramanian@apm.com>
    Signed-off-by: default avatarKeyur Chudgar <kchudgar@apm.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    bdd330f0