linux-kernel - Re: [GIT PULL 6/7] stm class: Fix an endless loop in channel allocation

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Message-ID: <20190221144217.GB9283@kroah.com>
Date:   Thu, 21 Feb 2019 15:42:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org, Zhi Jin <zhi.jin@...el.com>
Subject: Re: [GIT PULL 6/7] stm class: Fix an endless loop in channel
 allocation

On Thu, Feb 21, 2019 at 03:49:58PM +0200, Alexander Shishkin wrote:
> From: Zhi Jin <zhi.jin@...el.com>
> 
> There is a bug in the channel allocation logic that leads to an endless
> loop when looking for a contiguous range of channels in a range with a
> mixture of free and occupied channels. For example, opening three
> consequtive channels, closing the first two and requesting 4 channels in
> a row will trigger this soft lockup. The bug is that the search loop
> forgets to skip over the range once it detects that one channel in that
> range is occupied.
> 
> Restore the original intent to the logic by fixing the omission.
> 
> Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
> Signed-off-by: Zhi Jin <zhi.jin@...el.com>
> Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>

This should have a cc: stable in it, right?

thanks,

greg k-h