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| author |   Yake Yang <yake.yang@mediatek.com> | 2022-03-17 07:15:19 +0800 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2022-03-18 17:12:08 +0100 |
| commit | b062a0b9c1dc1ff63094337dccfe1568d5b62023 (patch) | |
| tree | 4837fd74cecd88475368479701c9bcccb2807c88 /drivers/bluetooth | |
| parent | Bluetooth: btmtkuart: fix error handling in mtk_hci_wmt_sync() (diff) | |
| download | linux-dev-b062a0b9c1dc1ff63094337dccfe1568d5b62023.tar.xz linux-dev-b062a0b9c1dc1ff63094337dccfe1568d5b62023.zip | |
Bluetooth: btmtksdio: Fix kernel oops in btmtksdio_interrupt
Fix the following kernel oops in btmtksdio_interrrupt
[ 14.339134] btmtksdio_interrupt+0x28/0x54
[ 14.339139] process_sdio_pending_irqs+0x68/0x1a0
[ 14.339144] sdio_irq_work+0x40/0x70
[ 14.339154] process_one_work+0x184/0x39c
[ 14.339160] worker_thread+0x228/0x3e8
[ 14.339168] kthread+0x148/0x3ac
[ 14.339176] ret_from_fork+0x10/0x30
That happened because hdev->power_on is already called before
sdio_set_drvdata which btmtksdio_interrupt handler relies on is not
properly set up.
The details are shown as the below: hci_register_dev would run
queue_work(hdev->req_workqueue, &hdev->power_on) as WQ_HIGHPRI
workqueue_struct to complete the power-on sequeunce and thus hci_power_on
may run before sdio_set_drvdata is done in btmtksdio_probe.
The hci_dev_do_open in hci_power_on would initialize the device and enable
the interrupt and thus it is possible that btmtksdio_interrupt is being
called right before sdio_set_drvdata is filled out.
When btmtksdio_interrupt is being called and sdio_set_drvdata is not filled
, the kernel oops is going to happen because btmtksdio_interrupt access an
uninitialized pointer.
Fixes: 9aebfd4a2200 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices")
Reviewed-by: Mark Chen <markyawenchen@gmail.com>
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Yake Yang <yake.yang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/btmtksdio.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c index df3f9d090529..9644069cecbb 100644 --- a/drivers/bluetooth/btmtksdio.c +++ b/drivers/bluetooth/btmtksdio.c @@ -1281,6 +1281,8 @@ static int btmtksdio_probe(struct sdio_func *func, hdev->manufacturer = 70; set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); + sdio_set_drvdata(func, bdev); + err = hci_register_dev(hdev); if (err < 0) { dev_err(&func->dev, "Can't register HCI device\n"); @@ -1288,8 +1290,6 @@ static int btmtksdio_probe(struct sdio_func *func, return err; } - sdio_set_drvdata(func, bdev); - /* pm_runtime_enable would be done after the firmware is being * downloaded because the core layer probably already enables * runtime PM for this func such as the case host->caps & |