lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 27 May 2019 08:50:26 -0400
From:   Brian Masney <>
To:     Adrian Hunter <>
Cc:     Arend Van Spriel <>,
        Franky Lin <>,
        Hante Meuleman <>,
        Chi-Hsien Lin <>,
        Wright Feng <>,,,,,,
        Kalle Valo <>,,,,
Subject: Re: Issue with Broadcom wireless in 5.2rc1 (was Re: [PATCH] mmc:
 sdhci: queue work after sdhci_defer_done())

On Mon, May 27, 2019 at 03:08:07PM +0300, Adrian Hunter wrote:
> On 27/05/19 12:37 PM, Brian Masney wrote:
> > On Sun, May 26, 2019 at 03:58:19PM -0400, Brian Masney wrote:
> >> I attached a patch that shows how I was able to determine what had
> >> already claimed the host.
> > On Mon, May 27, 2019 at 10:48:24AM +0300, Adrian Hunter wrote:
> >> This is because SDHCI is using the IRQ thread to process the SDIO card
> >> interrupt (sdio_run_irqs()).  When the card driver tries to use the card, it
> >> causes interrupts which deadlocks since c07a48c26519 ("mmc: sdhci: Remove
> >> finish_tasklet") has moved the tasklet processing to the IRQ thread.
> >>
> >> I would expect to be able to use the IRQ thread to complete requests, and it
> >> is desirable to do so because it is lower latency.
> >>
> >> Probably, SDHCI should use sdio_signal_irq() which queues a work item, and
> >> is what other drivers are doing.
> >>
> >> I will investigate some more and send a patch.
> Please try the patch below:
> From: Adrian Hunter <>
> Date: Mon, 27 May 2019 14:45:55 +0300
> Subject: [PATCH] mmc: sdhci: Fix SDIO IRQ thread deadlock
> Since commit c07a48c26519 ("mmc: sdhci: Remove finish_tasklet"), the IRQ
> thread might be used to complete requests, but the IRQ thread is also used
> to process SDIO card interrupts. This can cause a deadlock when the SDIO
> processing tries to access the card since that would also require the IRQ
> thread. Change SDHCI to use sdio_signal_irq() to schedule a work item
> instead. That also requires implementing the ->ack_sdio_irq() mmc host op.
> Signed-off-by: Adrian Hunter <>
> Fixes: c07a48c26519 ("mmc: sdhci: Remove finish_tasklet")

Yes, this fixes the issue for me. You can add my:

Reported-by: Brian Masney <>
Tested-by: Brian Masney <>



Powered by blists - more mailing lists