• Pavel Emelyanov's avatar
    8390: Don't oops on starting dev queue · b7126d8c
    Pavel Emelyanov authored
    The __NS8390_init tries to start the device queue before the
    device is registered. This results in an oops (snipped):
    
    [    2.865493] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
    [    2.866106] IP: [<ffffffffa000602a>] netif_start_queue+0xb/0x12 [8390]
    [    2.881267] Call Trace:
    [    2.881437]  [<ffffffffa000624d>] __NS8390_init+0x102/0x15a [8390]
    [    2.881999]  [<ffffffffa00062ae>] NS8390_init+0x9/0xb [8390]
    [    2.882237]  [<ffffffffa000d820>] ne2k_pci_init_one+0x297/0x354 [ne2k_pci]
    [    2.882955]  [<ffffffff811c7a0e>] local_pci_probe+0x12/0x16
    [    2.883308]  [<ffffffff811c85ad>] pci_device_probe+0xc3/0xef
    [    2.884049]  [<ffffffff8129218d>] driver_probe_device+0xbe/0x14b
    [    2.884937]  [<ffffffff81292260>] __driver_attach+0x46/0x62
    [    2.885170]  [<ffffffff81291788>] bus_for_each_dev+0x49/0x78
    [    2.885781]  [<ffffffff81291fbb>] driver_attach+0x1c/0x1e
    [    2.886089]  [<ffffffff812912ab>] bus_add_driver+0xba/0x227
    [    2.886330]  [<ffffffff8129259a>] driver_register+0x9e/0x115
    [    2.886933]  [<ffffffff811c8815>] __pci_register_driver+0x50/0xac
    [    2.887785]  [<ffffffffa001102c>] ne2k_pci_init+0x2c/0x2e [ne2k_pci]
    [    2.888093]  [<ffffffff81000212>] do_one_initcall+0x7c/0x130
    [    2.888693]  [<ffffffff8106d74f>] sys_init_module+0x99/0x1da
    [    2.888946]  [<ffffffff81002a2b>] system_call_fastpath+0x16/0x1b
    
    This happens because the netif_start_queue sets respective bit on the dev->_tx
    array which is not yet allocated.
    
    As far as I understand the code removing the netif_start_queue from __NS8390_init
    is OK, since queue will be started later on device open. Plz, correct me if I'm wrong.
    
    Found in the Dave's current tree, so he's in Cc.
    Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    b7126d8c
lib8390.c 34.8 KB