linux-kernel - [BUG] IB/hfi1: Warning when the driver fails to probe

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Date:   Sun, 10 Apr 2022 15:08:04 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     mike.marciniszyn@...nelisnetworks.com,
        dennis.dalessandro@...nelisnetworks.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] IB/hfi1: Warning when the driver fails to probe

Hello,

I found a bug at the init_one() function in the hfi driver.
When the function xa_alloc_irq() fails, the driver executes the error
handling function sdma_clean(), and this function uses the lock '
dd->sde_map_lock'. But this lock is initialized after executing the
function xa_alloc_irq(), which causes the following warning:

[   23.257762] hfi1 0000:00:05.0: Could not allocate unit ID: error 1
[   23.269915] INFO: trying to register non-static key.
[   23.270318] The code is fine but needs lockdep annotation, or maybe
[   23.270808] you didn't initialize this object before use?
[   23.271229] turning off the locking correctness validator.
[   23.273198] Call Trace:
[   23.274185]  register_lock_class+0x11b/0x880
[   23.274525]  __lock_acquire+0xf3/0x7930
[   23.275769]  lock_acquire+0xff/0x2d0
[   23.276053]  ? sdma_clean+0x42a/0x660 [hfi1]
[   23.276485]  ? lock_release+0x472/0x710
[   23.276789]  _raw_spin_lock_irq+0x46/0x60
[   23.277105]  ? sdma_clean+0x42a/0x660 [hfi1]
[   23.277530]  sdma_clean+0x42a/0x660 [hfi1]
[   23.277945]  ? trace_kfree+0x28/0xc0
[   23.278232]  hfi1_free_devdata+0x3a7/0x420 [hfi1]
[   23.278688]  init_one+0x867/0x11a0 [hfi1]
[   23.279090]  ? _raw_spin_unlock_irqrestore+0x3d/0x60
[   23.279482]  ? rcu_lock_release+0x20/0x20 [hfi1]
[   23.279930]  pci_device_probe+0x40e/0x8d0

Regards,
Zheyu Ma