linux-kernel - [patch 097/176] rapidio: fix hang on RapidIO doorbell queue full condition

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]

Message-Id: <20110216002108.787652188@clark.kroah.org>
Date:	Tue, 15 Feb 2011 16:21:05 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Thomas Taranowski <tom@...ingforge.com>,
	Alexandre Bounine <alexandre.bounine@....com>,
	Kumar Gala <galak@...nel.crashing.org>,
	Matt Porter <mporter@...nel.crashing.org>,
	Li Yang <leoli@...escale.com>,
	Thomas Moll <thomas.moll@...go.com>,
	Micha Nelissen <micha@...i.hopto.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: [patch 097/176] rapidio: fix hang on RapidIO doorbell queue full condition

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Thomas Taranowski <tom@...ingforge.com>

commit 12a4dc43911785f51a596f771ae0701b18d436f1 upstream.

In fsl_rio_dbell_handler() the code currently simply acknowledges the QFI
queue full interrupt, but does nothing to resolve the queue full
condition.  Instead, it jumps to the end of the isr.  When a queue full
condition occurs, the isr is then re-entered immediately and continually,
forever.

The fix is to just fall through and read out current doorbell entries.

Signed-off-by: Thomas Taranowski <tom@...ingforge.com>
Cc: Alexandre Bounine <alexandre.bounine@....com>
Cc: Kumar Gala <galak@...nel.crashing.org>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Li Yang <leoli@...escale.com>
Cc: Thomas Moll <thomas.moll@...go.com>
Cc: Micha Nelissen <micha@...i.hopto.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Grant Likely <grant.likely@...retlab.ca>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/powerpc/sysdev/fsl_rio.c |    1 -
 1 file changed, 1 deletion(-)

--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -954,7 +954,6 @@ fsl_rio_dbell_handler(int irq, void *dev
 	if (dsr & DOORBELL_DSR_QFI) {
 		pr_info("RIO: doorbell queue full\n");
 		out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_QFI);
-		goto out;
 	}
 
 	/* XXX Need to check/dispatch until queue empty */


--
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/