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    Subject[PATCH 5.19 0743/1157] driver core: fix potential deadlock in __driver_attach
    Date
    From: Zhang Wensheng <zhangwensheng5@huawei.com>

    [ Upstream commit 70fe758352cafdee72a7b13bf9db065f9613ced8 ]

    In __driver_attach function, There are also AA deadlock problem,
    like the commit b232b02bf3c2 ("driver core: fix deadlock in
    __device_attach").

    stack like commit b232b02bf3c2 ("driver core: fix deadlock in
    __device_attach").
    list below:
    In __driver_attach function, The lock holding logic is as follows:
    ...
    __driver_attach
    if (driver_allows_async_probing(drv))
    device_lock(dev) // get lock dev
    async_schedule_dev(__driver_attach_async_helper, dev); // func
    async_schedule_node
    async_schedule_node_domain(func)
    entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
    /* when fail or work limit, sync to execute func, but
    __driver_attach_async_helper will get lock dev as
    will, which will lead to A-A deadlock. */
    if (!entry || atomic_read(&entry_count) > MAX_WORK) {
    func;
    else
    queue_work_node(node, system_unbound_wq, &entry->work)
    device_unlock(dev)

    As above show, when it is allowed to do async probes, because of
    out of memory or work limit, async work is not be allowed, to do
    sync execute instead. it will lead to A-A deadlock because of
    __driver_attach_async_helper getting lock dev.

    Reproduce:
    and it can be reproduce by make the condition
    (if (!entry || atomic_read(&entry_count) > MAX_WORK)) untenable, like
    below:

    [ 370.785650] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
    this message.
    [ 370.787154] task:swapper/0 state:D stack: 0 pid: 1 ppid:
    0 flags:0x00004000
    [ 370.788865] Call Trace:
    [ 370.789374] <TASK>
    [ 370.789841] __schedule+0x482/0x1050
    [ 370.790613] schedule+0x92/0x1a0
    [ 370.791290] schedule_preempt_disabled+0x2c/0x50
    [ 370.792256] __mutex_lock.isra.0+0x757/0xec0
    [ 370.793158] __mutex_lock_slowpath+0x1f/0x30
    [ 370.794079] mutex_lock+0x50/0x60
    [ 370.794795] __device_driver_lock+0x2f/0x70
    [ 370.795677] ? driver_probe_device+0xd0/0xd0
    [ 370.796576] __driver_attach_async_helper+0x1d/0xd0
    [ 370.797318] ? driver_probe_device+0xd0/0xd0
    [ 370.797957] async_schedule_node_domain+0xa5/0xc0
    [ 370.798652] async_schedule_node+0x19/0x30
    [ 370.799243] __driver_attach+0x246/0x290
    [ 370.799828] ? driver_allows_async_probing+0xa0/0xa0
    [ 370.800548] bus_for_each_dev+0x9d/0x130
    [ 370.801132] driver_attach+0x22/0x30
    [ 370.801666] bus_add_driver+0x290/0x340
    [ 370.802246] driver_register+0x88/0x140
    [ 370.802817] ? virtio_scsi_init+0x116/0x116
    [ 370.803425] scsi_register_driver+0x1a/0x30
    [ 370.804057] init_sd+0x184/0x226
    [ 370.804533] do_one_initcall+0x71/0x3a0
    [ 370.805107] kernel_init_freeable+0x39a/0x43a
    [ 370.805759] ? rest_init+0x150/0x150
    [ 370.806283] kernel_init+0x26/0x230
    [ 370.806799] ret_from_fork+0x1f/0x30

    To fix the deadlock, move the async_schedule_dev outside device_lock,
    as we can see, in async_schedule_node_domain, the parameter of
    queue_work_node is system_unbound_wq, so it can accept concurrent
    operations. which will also not change the code logic, and will
    not lead to deadlock.

    Fixes: ef0ff68351be ("driver core: Probe devices asynchronously instead of the driver")
    Signed-off-by: Zhang Wensheng <zhangwensheng5@huawei.com>
    Link: https://lore.kernel.org/r/20220622074327.497102-1-zhangwensheng5@huawei.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/base/dd.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/drivers/base/dd.c b/drivers/base/dd.c
    index 11b0fb6414d3..b766968a873c 100644
    --- a/drivers/base/dd.c
    +++ b/drivers/base/dd.c
    @@ -1115,6 +1115,7 @@ static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
    static int __driver_attach(struct device *dev, void *data)
    {
    struct device_driver *drv = data;
    + bool async = false;
    int ret;

    /*
    @@ -1153,9 +1154,11 @@ static int __driver_attach(struct device *dev, void *data)
    if (!dev->driver && !dev->p->async_driver) {
    get_device(dev);
    dev->p->async_driver = drv;
    - async_schedule_dev(__driver_attach_async_helper, dev);
    + async = true;
    }
    device_unlock(dev);
    + if (async)
    + async_schedule_dev(__driver_attach_async_helper, dev);
    return 0;
    }

    --
    2.35.1


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