Re: [Xen-devel] [PATCHv6] xenbus: fix deadlock on writes to /proc/xen/xenbus

[Juergen Gross <jgross@xxxxxxxx>]

On 09/12/16 15:41, David Vrabel wrote:
> /proc/xen/xenbus does not work correctly.  A read blocked waiting for
> a xenstore message holds the mutex needed for atomic file position
> updates.  This blocks any writes on the same file handle, which can
> deadlock if the write is needed to unblock the read.
> 
> Clear FMODE_ATOMIC_POS when opening this device to always get
> character device like sematics.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Committed to xen/tip.git for-linus-4.10


Juergen

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