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From: Peter Maydell <peter.maydell@linaro.org>
To: John Snow <jsnow@redhat.com>
Cc: Stefan Fritsch <sf@sfritsch.de>, QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PULL 2/3] ahci: Force ICC bits in PxCMD to zero
Date: Tue, 21 Jul 2015 12:38:00 +0100
Message-ID: <CAFEAcA_7OKrZexyoAFc3Jhiib=Syf3UUKPYGNxdPmQO_wm-vMQ@mail.gmail.com> (raw)
In-Reply-To: <1437416961-26348-3-git-send-email-jsnow@redhat.com>

On 20 July 2015 at 19:29, John Snow <jsnow@redhat.com> wrote:
> From: Stefan Fritsch <sf@sfritsch.de>
>
> The AHCI spec requires that the HBA sets the ICC bits to zero after the
> ICC change is done. Since we don't do any ICC change, force the bits to
> zero all the time.
>
> This fixes delays with some OSs (e.g. OpenBSD) waiting for the ICC bits
> to change to 0.

This change provokes a lot of clang sanitizer warnings:

/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:288:49: runtime
error: left shift of 15 by 28 places cannot be represented in type
'int'

PORT_CMD_ICC_MASK is defined as

 #define PORT_CMD_ICC_MASK         (0xf << 28) /* i/f ICC state mask */

which shifts into the sign bit of a signed integer.

thanks
-- PMM

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-20 18:29 [Qemu-devel] [PULL 0/3] Ide patches John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 1/3] qtest/ide: add another short PRDT test flavor John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 2/3] ahci: Force ICC bits in PxCMD to zero John Snow
2015-07-21 11:38   ` Peter Maydell [this message]
2015-07-21 12:55     ` Eric Blake
2015-07-21 13:02       ` Peter Maydell
2015-07-21 17:41         ` John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 3/3] tests: Fix broken targets check-report-qtest-* John Snow
2015-07-21 10:18 ` [Qemu-devel] [PULL 0/3] Ide patches Peter Maydell

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