From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Hang during boot, bisected to commit 96d60303fd Date: Mon, 07 Jun 2010 11:22:37 +0200 Message-ID: <4C0CBA5D.5000900@kernel.org> References: <20100603020006.GB19123@srcf.ucam.org> <4C08760B.8050002@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:44631 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752186Ab0FGJW6 (ORCPT ); Mon, 7 Jun 2010 05:22:58 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Robert Hancock Cc: Marc Dionne , Matthew Garrett , Linux Kernel Mailing List , linux-ide@vger.kernel.org, garzik@redhat.com Hello, On 06/07/2010 06:34 AM, Robert Hancock wrote: > I'm thinking that the hardreset and device classification makes more > sense as a place to do this anyways, since that's the point where we > really know if there's a device connected or not.. Tejun, any > thoughts? Heh, of course it doesn't work. Device presence can't be reliably determined by sampling status once like that. We don't have all the crap in libata-eh for nothing. :-) Marc, can you please try the following patch? Thanks. diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 1984a6e..261f86d 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -541,29 +541,11 @@ static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val) return -EINVAL; } -static int ahci_is_device_present(void __iomem *port_mmio) -{ - u8 status = readl(port_mmio + PORT_TFDATA) & 0xff; - - /* Make sure PxTFD.STS.BSY and PxTFD.STS.DRQ are 0 */ - if (status & (ATA_BUSY | ATA_DRQ)) - return 0; - - /* Make sure PxSSTS.DET is 3h */ - status = readl(port_mmio + PORT_SCR_STAT) & 0xf; - if (status != 3) - return 0; - return 1; -} - void ahci_start_engine(struct ata_port *ap) { void __iomem *port_mmio = ahci_port_base(ap); u32 tmp; - if (!ahci_is_device_present(port_mmio)) - return; - /* start DMA */ tmp = readl(port_mmio + PORT_CMD); tmp |= PORT_CMD_START; @@ -1892,6 +1874,9 @@ static void ahci_error_handler(struct ata_port *ap) } sata_pmp_error_handler(ap); + + if (!ata_dev_enabled(ap->link.device)) + ahci_stop_engine(ap); } static void ahci_post_internal_cmd(struct ata_queued_cmd *qc) -- tejun