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Yevgeny Petrilin authored
Under the spinlock we call request_irq(), which allocates memory with GFP_KERNEL, This causes the following trace when DEBUG_SPINLOCK is enabled, it can cause the following trace: BUG: spinlock wrong CPU on CPU#2, ethtool/2595 lock: ffff8801f9cbc2b0, .magic: dead4ead, .owner: ethtool/2595, .owner_cpu: 0 Pid: 2595, comm: ethtool Not tainted 3.0.18 #2 Call Trace: spin_bug+0xa2/0xf0 do_raw_spin_unlock+0x71/0xa0 _raw_spin_unlock+0xe/0x10 mlx4_assign_eq+0x12b/0x190 [mlx4_core] mlx4_en_activate_cq+0x252/0x2d0 [mlx4_en] ? mlx4_en_activate_rx_rings+0x227/0x370 [mlx4_en] mlx4_en_start_port+0x189/0xb90 [mlx4_en] mlx4_en_set_ringparam+0x29a/0x340 [mlx4_en] dev_ethtool+0x816/0xb10 ? dev_get_by_name_rcu+0xa4/0xe0 dev_ioctl+0x2b5/0x470 handle_mm_fault+0x1cd/0x2d0 sock_do_ioctl+0x5d/0x70 sock_ioctl+0x79/0x2f0 do_vfs_ioctl+0x8c/0x340 sys_ioctl+0xa1/0xb0 system_call_fastpath+0x16/0x1b Replacing with mutex, which is enough in this case. Signed-off-by:
Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by:
David S. Miller <davem@davemloft.net>
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