linux-kernel - Re: [4/6] 2.6.21-rc2: known regressions

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Message-Id: <200703081828.33606.lenb@kernel.org>
Date:	Thu, 8 Mar 2007 18:28:32 -0500
From:	Len Brown <lenb@...nel.org>
To:	"Antonino A. Daplas" <adaplas@...il.com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Nelless <andrew@...less.net>,
	linux-acpi@...r.kernel.org, Jiri Kosina <jikos@...os.cz>,
	Richard Purdie <rpurdie@...ys.net>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Yaroslav Halchenko <kernel@...russian.com>,
	Alex Romosan <romosan@...orax.lbl.gov>,
	David Miller <davem@...emloft.net>,
	James Simmons <jsimmons@...radead.org>,
	benh@...nel.crashing.org, Andreas Schwab <schwab@...e.de>
Subject: Re: [4/6] 2.6.21-rc2: known regressions

On Monday 05 March 2007 05:35, Antonino A. Daplas wrote:
> On Mon, 2007-03-05 at 02:50 +0100, Adrian Bunk wrote:
> > This email lists some known regressions in 2.6.21-rc2 compared to 2.6.20
> > that are not yet fixed in Linus' tree.
> > 
> > If you find your name in the Cc header, you are either submitter of one
> > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > of you caused a breakage or I'm considering you in any other way
> > possibly involved with one or more of these issues.
> > 
> > Due to the huge amount of recipients, please trim the Cc when answering.
> > 
> > 
> > Subject    : Asus A8N-VM motherboard:
> >              framebuffer/console boot failure boot failure (ACPI related)
> > References : http://lkml.org/lkml/2007/2/23/132
> > Submitter  : Andrew Nelless <andrew@...less.net>
> > Caused-By  : Len Brown <len.brown@...el.com>
> >              commit 7f8f97c3cc75d5783d0b45cf323dedf17684be19
> > Handled-By : Antonino A. Daplas <adaplas@...il.com>
> > Status     : problem is being debugged
> > 
> 
> This is not a framebuffer nor console problem.
> 
> I think Andrew Nelless confirmed that the cause is from the above
> commit. How to fix it, I don't know.  Perhaps the
> acpi_skip_timer_override boot option has to be used.

Looks like I got fooled by the negative logic for the nvidia_bugs().
Please test this patch -- it should fix it,
as well as simplify the code a bit.

thanks,
-Len


Subject: ACPI: repair nvidia early quirk breakage on x86_64

x86_64 nvidia_bugs() broke when we bailed out on not finding the HPET.
However, the quirk works by checking for _not_ finding the HPET...

Delete the nvidia_hpet_detected flag and simply test for
not finding the HPET, which is simple to do now that
acpi_table_parse returns 1 on failure.

Signed-off-by: Len Brown <len.brown@...el.com>
---
 i386/kernel/acpi/earlyquirk.c |    7 +------
 x86_64/kernel/early-quirks.c  |    9 +--------
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
index bf86f76..7fdba8a 100644
--- a/arch/i386/kernel/acpi/earlyquirk.c
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -14,11 +14,8 @@
 
 #ifdef CONFIG_ACPI
 
-static int nvidia_hpet_detected __initdata;
-
 static int __init nvidia_hpet_check(struct acpi_table_header *header)
 {
-	nvidia_hpet_detected = 1;
 	return 0;
 }
 #endif
@@ -29,9 +26,7 @@ static int __init check_bridge(int vendor, int device)
 	/* According to Nvidia all timer overrides are bogus unless HPET
 	   is enabled. */
 	if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
-		nvidia_hpet_detected = 0;
-		acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check);
-		if (nvidia_hpet_detected == 0) {
+		if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check) {
 			acpi_skip_timer_override = 1;
 			  printk(KERN_INFO "Nvidia board "
                        "detected. Ignoring ACPI "
diff --git a/arch/x86_64/kernel/early-quirks.c b/arch/x86_64/kernel/early-quirks.c
index 8047ea8..dec587b 100644
--- a/arch/x86_64/kernel/early-quirks.c
+++ b/arch/x86_64/kernel/early-quirks.c
@@ -30,11 +30,8 @@ static void via_bugs(void)
 
 #ifdef CONFIG_ACPI
 
-static int nvidia_hpet_detected __initdata;
-
 static int __init nvidia_hpet_check(struct acpi_table_header *header)
 {
-	nvidia_hpet_detected = 1;
 	return 0;
 }
 #endif
@@ -52,11 +49,7 @@ static void nvidia_bugs(void)
 	if (acpi_use_timer_override)
 		return;
 
-	nvidia_hpet_detected = 0;
-	if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check))
-		return;
-
-	if (nvidia_hpet_detected == 0) {
+	if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
 		acpi_skip_timer_override = 1;
 		printk(KERN_INFO "Nvidia board "
 		       "detected. Ignoring ACPI "
-
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