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authorDan Williams <dcbw@redhat.com>2010-03-11 13:20:43 -0800
committerDan Williams <dcbw@redhat.com>2010-03-11 13:20:43 -0800
commit749f9c0eb569b29772dde9561b9856e4f878d9ef (patch)
tree6f211060b7e7fa6e4cf9e17c2731f56c6fad5504 /plugins/mm-modem-zte.c
parentc7739979ed4a8be97d03ab7ed0087d63dc218cf4 (diff)
core: stop probing known-unusable ports early
Some ports we know we shouldn't use when we get certain responses from them. Reading from these ports triggers kernel bugs (at least on 2.6.31 and 2.6.32) relating to flow control in some drivers (*cough* hso *cough*), so lets try not to aggravate the kernel too much. This happens on Icera-based Option devices like the GI0322 (AT&T Quicksilver) for example. (note: AFAICT this doesn't have any relation to the recent XON/XOFF patch, since I get this problem without the XON/XOFF patch on both 2.6.31 and 2.6.32 as well) --- BUG: sleeping function called from invalid context at kernel/mutex.c:94 in_atomic(): 1, irqs_disabled(): 1, pid: 9295, name: modem-manager Pid: 9295, comm: modem-manager Not tainted 2.6.32.9-67.fc12.x86_64 #1 Call Trace: <IRQ> [<ffffffff81045d41>] __might_sleep+0xed/0xef [<ffffffff81454dd0>] mutex_lock+0x24/0x50 [<ffffffff8104811e>] ? enqueue_task_fair+0x2a/0x6d [<ffffffff812af79f>] tty_throttle+0x1b/0x49 [<ffffffff812af0d9>] n_tty_receive_buf+0xdbb/0xe12 [<ffffffff810459fd>] ? task_rq_unlock+0x11/0x13 [<ffffffff81050c5c>] ? try_to_wake_up+0x2f3/0x305 [<ffffffff8110de0c>] ? __kmalloc+0x37/0x15e [<ffffffff8110de42>] ? __kmalloc+0x6d/0x15e [<ffffffff812b12c9>] flush_to_ldisc+0xf8/0x18d [<ffffffff812b13ae>] tty_flip_buffer_push+0x50/0x61 [<ffffffffa040ccd5>] put_rxbuf_data+0xea/0x124 [hso] [<ffffffffa040cd97>] put_rxbuf_data_and_resubmit_bulk_urb+0x21/0x6b [hso] [<ffffffffa040d0b1>] hso_std_serial_read_bulk_callback+0x14d/0x15f [hso] [<ffffffff8132edf7>] ? dma_unmap_single_attrs.clone.0+0x38/0x3a [<ffffffff8132ef74>] usb_hcd_giveback_urb+0x91/0xc5 [<ffffffff813417c8>] ehci_urb_done+0x7b/0x90 [<ffffffff81050c5c>] ? try_to_wake_up+0x2f3/0x305 [<ffffffff81341b45>] qh_completions+0x368/0x4b9 [<ffffffff8103e7a0>] ? __wake_up_common+0x4e/0x84 [<ffffffff81343f70>] ehci_work+0x95/0x732 [<ffffffff81045b53>] ? __wake_up+0x44/0x4d [<ffffffff81070490>] ? insert_work+0x8e/0x9b [<ffffffff81345f01>] ehci_irq+0x2be/0x420 [<ffffffff8107071a>] ? __queue_work+0x3a/0x41 [<ffffffff81049e43>] ? resched_cpu+0x6e/0x77 [<ffffffff8107075d>] ? delayed_work_timer_fn+0x3c/0x3e [<ffffffff810b0e44>] ? __rcu_process_callbacks+0x7d/0x28a [<ffffffff8132e846>] usb_hcd_irq+0x3f/0x7b [<ffffffff810acd61>] handle_IRQ_event+0x60/0x121 [<ffffffff810aeb8e>] handle_fasteoi_irq+0x8b/0xc7 [<ffffffff81014625>] handle_irq+0x8b/0x96 [<ffffffff81459c14>] do_IRQ+0x5c/0xbc [<ffffffff81012693>] ret_from_intr+0x0/0x11
Diffstat (limited to 'plugins/mm-modem-zte.c')
0 files changed, 0 insertions, 0 deletions