From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Mon, 20 Oct 2014 18:34:18 +0000 (-0700)
Subject: staging: comedi: addi_apci_3120: prevent deadlock in apci3120_ao_insn_write()
X-Git-Tag: omap-for-v3.19/fixes-rc1~73^2~808
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce987a8a8f86c063c6332da83dfa514a1582c2f3;p=pandora-kernel.git

staging: comedi: addi_apci_3120: prevent deadlock in apci3120_ao_insn_write()

The DA_READY bit (0x0001) in the status register needs to be set before the
analog outputs can be updated.

Use comedi_timeout() to prevent a deadlock condition while waiting for the
DA_READY bit to get set.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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