forked from Minki/linux
39644e9ac5
If the driver is unloaded while there is still a host command in flight, its tfd will be freed by iwl_tx_queue_free. This function is called for both types of queues: Tx queues and cmd queue. This didn't take in count the fact that in Tx queues, tfds are mapped as TO_DEVICE (besides the first TB), whereas in cmd queue, all TBs are mapped as BIDI. Hence, tx_queue_free unmapped the second (and higher) TB of each tfd in the cmd queue as TO_DEVICE, whereas they must be freed as BIDI. This means that if a multi TFD is in flight while we unload the driver (which is quite unlikely but can happen), we will get the warning below. This patch fixes this. [ 445.234060] ------------[ cut here ]------------ [ 445.236273] WARNING: at lib/dma-debug.c:861 check_unmap+0x337/0x780() [ 445.236654] iwlagn 0000:02:00.0: DMA-API: device driver frees DMA memory with different direction [device address=0x0000000126950540] [size=8 bytes] [mapped with DMA_BIDIRECTIONAL] [unmapped with DMA_TO_DEVICE] [ 445.236654] Modules linked in: ... [ 445.236654] Pid: 1415, comm: modprobe Not tainted 3.1.0-rc4-wl-65912-g5215ff1-dirty #79 [ 445.236654] Call Trace: [ 445.236654] [<ffffffff81043a51>] warn_slowpath_common+0x71/0xa0 [ 445.236654] [<ffffffff81043b37>] warn_slowpath_fmt+0x47/0x50 [ 445.236654] [<ffffffff8121e687>] check_unmap+0x337/0x780 [ 445.236654] [<ffffffff810e9136>] ? free_one_page+0x156/0x320 [ 445.236654] [<ffffffff8121ec5a>] debug_dma_unmap_page+0x5a/0x60 [ 445.236654] [<ffffffffa021d701>] iwlagn_unmap_tfd.isra.11+0x121/0x1c0 [iwlagn] [ 445.236654] [<ffffffffa021ddf2>] iwlagn_txq_free_tfd+0x42/0x70 [iwlagn] [ 445.236654] [<ffffffffa02121de>] iwl_tx_queue_unmap+0x4e/0x70 [iwlagn] [ 445.236654] [<ffffffffa0212fad>] iwl_trans_pcie_tx_free+0x10d/0x440 [iwlagn] [ 445.236654] [<ffffffff81064959>] ? destroy_workqueue+0xb9/0x1e0 [ 445.236654] [<ffffffffa021330a>] iwl_trans_pcie_free+0x2a/0x2c0 [iwlagn] [ 445.236654] [<ffffffffa022f4f2>] iwl_remove+0x149/0x17e [iwlagn] [ 445.236654] [<ffffffffa022f546>] iwl_pci_remove+0x1f/0x65 [iwlagn] [ 445.236654] [<ffffffff81228337>] pci_device_remove+0x47/0x120 [ 445.236654] [<ffffffff8134566c>] __device_release_driver+0x7c/0xe0 [ 445.236654] [<ffffffff81345dc8>] driver_detach+0xc8/0xd0 [ 445.236654] [<ffffffff813454c8>] bus_remove_driver+0x88/0xe0 [ 445.236654] [<ffffffff81346572>] driver_unregister+0x62/0xa0 [ 445.236654] [<ffffffff812271d4>] pci_unregister_driver+0x44/0xc0 [ 445.236654] [<ffffffffa0211ce5>] iwl_pci_unregister_driver+0x15/0x20 [iwlagn] [ 445.236654] [<ffffffffa022f595>] iwl_exit+0x9/0xa74 [iwlagn] [ 445.236654] [<ffffffff810918f4>] sys_delete_module+0x184/0x240 [ 445.236654] [<ffffffff81452ece>] ? retint_swapgs+0xe/0x13 [ 445.236654] [<ffffffff8121098e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 445.236654] [<ffffffff81459e2b>] system_call_fastpath+0x16/0x1b [ 445.236654] ---[ end trace 1fbc362b7dbe5d74 ]--- [ 445.236654] Mapped at: [ 445.236654] [<ffffffff8121d7cb>] debug_dma_map_page+0x8b/0x150 [ 445.236654] [<ffffffffa021e7b7>] iwl_enqueue_hcmd+0x837/0xa40 [iwlagn] [ 445.236654] [<ffffffffa021f92d>] iwl_trans_pcie_send_cmd+0x8d/0x580 [iwlagn] [ 445.236654] [<ffffffffa01f7c75>] iwl_send_calib_results+0x75/0xd0 [iwlagn] [ 445.236654] [<ffffffffa01f21f6>] iwlagn_alive_notify+0x196/0x1f0 [iwlagn] [ 445.386500] iwlagn 0000:02:00.0: PCI INT A disabled Reported-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> |
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| .. | ||
| iwl-1000.c | ||
| iwl-2000.c | ||
| iwl-5000-hw.h | ||
| iwl-5000.c | ||
| iwl-6000-hw.h | ||
| iwl-6000.c | ||
| iwl-agn-calib.c | ||
| iwl-agn-calib.h | ||
| iwl-agn-eeprom.c | ||
| iwl-agn-hw.h | ||
| iwl-agn-lib.c | ||
| iwl-agn-rs.c | ||
| iwl-agn-rs.h | ||
| iwl-agn-rxon.c | ||
| iwl-agn-sta.c | ||
| iwl-agn-tt.c | ||
| iwl-agn-tt.h | ||
| iwl-agn-tx.c | ||
| iwl-agn-ucode.c | ||
| iwl-agn.c | ||
| iwl-agn.h | ||
| iwl-bus.h | ||
| iwl-commands.h | ||
| iwl-core.c | ||
| iwl-core.h | ||
| iwl-csr.h | ||
| iwl-debug.h | ||
| iwl-debugfs.c | ||
| iwl-dev.h | ||
| iwl-devtrace.c | ||
| iwl-devtrace.h | ||
| iwl-eeprom.c | ||
| iwl-eeprom.h | ||
| iwl-fh.h | ||
| iwl-helpers.h | ||
| iwl-io.c | ||
| iwl-io.h | ||
| iwl-led.c | ||
| iwl-led.h | ||
| iwl-pci.c | ||
| iwl-pci.h | ||
| iwl-power.c | ||
| iwl-power.h | ||
| iwl-prph.h | ||
| iwl-rx.c | ||
| iwl-scan.c | ||
| iwl-shared.h | ||
| iwl-sta.c | ||
| iwl-sta.h | ||
| iwl-sv-open.c | ||
| iwl-testmode.h | ||
| iwl-trans-int-pcie.h | ||
| iwl-trans-rx-pcie.c | ||
| iwl-trans-tx-pcie.c | ||
| iwl-trans.c | ||
| iwl-trans.h | ||
| Kconfig | ||
| Makefile | ||