linux-kernel - RE: [PATCH 2/4] PCI: rcar: Support runtime PM link state L1 handling in pcie-rcar

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 18 Dec 2015 13:42:08 +0000
From:	Phil Edworthy <phil.edworthy@...esas.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	Simon Horman <horms@...ge.net.au>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: RE: [PATCH 2/4] PCI: rcar: Support runtime PM link state L1 handling
 in pcie-rcar

Hi Wolfram,

On 17 December 2015 13:31, Wolfram Sang wrote:
> Hi Phil,
> 
> > +		/* Wait until we are in L1 */
> > +		while (!(val & L1FAEG))
> > +			val = rcar_pci_read_reg(pcie, PMSR);
> 
> No timeout?
Since the hardware doesn't support hot plug, I believe this loop will
always exit very quickly. Unless someone has taken a hammer to the HW
of course.
However, point taken. I'll add a timeout.

> Regards,
> 
>    Wolfram

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/