linux-kernel - [POWERPC] fix spin lock nesting in hvc

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] [day] [month] [year] [list]

Date:	Tue, 26 Sep 2006 11:54:16 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	paulus@...ba.org
Cc:	"Alexey Dobriyan" <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, ppc-dev <linuxppc-dev@...abs.org>
Subject: [POWERPC] fix spin lock nesting in hvc_iseries

We had nested spinlocks using the same flags variable, but it turns out
that we don't need the nested locks at all (the lock protects a static
buffer that we aren't using here), so just remove the extra locks.

Spotted by Alexey Dobriyan.

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 drivers/char/hvc_iseries.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --git a/drivers/char/hvc_iseries.c b/drivers/char/hvc_iseries.c
index ea36201..f144a94 100644
--- a/drivers/char/hvc_iseries.c
+++ b/drivers/char/hvc_iseries.c
@@ -154,9 +154,7 @@ static int put_chars(uint32_t vtermno, c
 	spin_lock_irqsave(&consolelock, flags);
 
 	if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
-		spin_lock_irqsave(&consoleloglock, flags);
 		HvCall_writeLogBuffer(buf, count);
-		spin_unlock_irqrestore(&consoleloglock, flags);
 		sent = count;
 		goto done;
 	}
@@ -172,11 +170,8 @@ static int put_chars(uint32_t vtermno, c
 
 		len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
 
-		if (viochar_is_console(pi)) {
-			spin_lock_irqsave(&consoleloglock, flags);
+		if (viochar_is_console(pi))
 			HvCall_writeLogBuffer(buf, len);
-			spin_unlock_irqrestore(&consoleloglock, flags);
-		}
 
 		init_data_event(viochar, pi->lp);
 
-- 
1.4.2.1

-
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/