Subject: Re: [PATCH net v1] net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex

From: [email-masked]
Date: Thu, 01 Aug 2024 01:10:37 +0000

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email-masked]>:

On Tue, 30 Jul 2024 08:31:04 +0200 you wrote:
> The carrier_lock spinlock protects the carrier detection. While it is
> hold, framer_get_status() is called witch in turn takes a mutex.
> This is not correct and can lead to a deadlock.
> 
> A run with PROVE_LOCKING enabled detected the issue:
>   [ BUG: Invalid wait context ]
>   ...
>   c204ddbc (&framer->mutex){+.+.}-{3:3}, at: framer_get_status+0x40/0x78
>   other info that might help us debug this:
>   context-{4:4}
>   2 locks held by ifconfig/146:
>   #0: c0926a38 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x12c/0x664
>   #1: c2006a40 (&qmc_hdlc->carrier_lock){....}-{2:2}, at: qmc_hdlc_framer_set_carrier+0x30/0x98
> 
> [...]

Here is the summary with links:
  - [net,v1] net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex
    https://git.kernel.org/netdev/net/c/c4d6a347ba7b

You are awesome, thank you!
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