From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
Michael Schmitz <schmitzmic@gmail.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
"James E.J. Bottomley" <JBottomley@parallels.com>,
linux-scsi@vger.kernel.org
Subject: [PATCH 02/16] scsi: atari_scsi: fix sleep_on race
Date: Wed, 26 Feb 2014 12:01:42 +0100 [thread overview]
Message-ID: <1393412516-3762435-3-git-send-email-arnd@arndb.de> (raw)
In-Reply-To: <1393412516-3762435-1-git-send-email-arnd@arndb.de>
sleep_on is known broken and going away. The atari_scsi driver is one of
two remaining users in the falcon_get_lock() function, which is a rather
crazy piece of code. This does not attempt to fix the driver's locking
scheme in general, but at least prevents falcon_get_lock from going to
sleep when no other thread holds the same lock or tries to get it,
and we no longer schedule with irqs disabled.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: James E.J. Bottomley <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
---
drivers/scsi/atari_scsi.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index a3e6c8a..b33ce34 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -90,6 +90,7 @@
#include <linux/init.h>
#include <linux/nvram.h>
#include <linux/bitops.h>
+#include <linux/wait.h>
#include <asm/setup.h>
#include <asm/atarihw.h>
@@ -549,8 +550,10 @@ static void falcon_get_lock(void)
local_irq_save(flags);
- while (!in_irq() && falcon_got_lock && stdma_others_waiting())
- sleep_on(&falcon_fairness_wait);
+ wait_event_cmd(falcon_fairness_wait,
+ !in_irq() && falcon_got_lock && stdma_others_waiting(),
+ local_irq_restore(flags),
+ local_irq_save(flags));
while (!falcon_got_lock) {
if (in_irq())
@@ -562,7 +565,10 @@ static void falcon_get_lock(void)
falcon_trying_lock = 0;
wake_up(&falcon_try_wait);
} else {
- sleep_on(&falcon_try_wait);
+ wait_event_cmd(falcon_try_wait,
+ falcon_got_lock && !falcon_trying_lock,
+ local_irq_restore(flags),
+ local_irq_save(flags));
}
}
--
1.8.3.2
next prev parent reply other threads:[~2014-02-26 11:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-26 11:01 [PATCH 00/16] sleep_on removal, second try Arnd Bergmann
2014-02-26 11:01 ` [PATCH 01/16] ataflop: fix sleep_on races Arnd Bergmann
2014-02-26 11:01 ` Arnd Bergmann [this message]
2014-02-27 7:58 ` [PATCH 02/16] scsi: atari_scsi: fix sleep_on race Michael Schmitz
2014-02-27 20:44 ` Arnd Bergmann
2014-03-01 0:24 ` Michael Schmitz
2014-02-26 11:01 ` [PATCH 03/16] DAC960: remove sleep_on usage Arnd Bergmann
2014-02-26 11:01 ` [PATCH 04/16] swim3: fix interruptible_sleep_on race Arnd Bergmann
2014-02-26 11:01 ` [PATCH 05/16] [media] omap_vout: avoid sleep_on race Arnd Bergmann
2014-02-26 11:01 ` [PATCH 06/16] [media] usbvision: drop unused define USBVISION_SAY_AND_WAIT Arnd Bergmann
2014-02-26 11:01 ` [PATCH 07/16] [media] radio-cadet: avoid interruptible_sleep_on race Arnd Bergmann
2014-02-26 11:01 ` [PATCH 08/16] [media] arv: fix sleep_on race Arnd Bergmann
2014-02-26 11:01 ` [PATCH 09/16] parport: fix interruptible_sleep_on race Arnd Bergmann
2014-02-26 11:01 ` [PATCH 10/16] atm: nicstar: remove interruptible_sleep_on_timeout Arnd Bergmann
2014-02-26 16:06 ` David Miller
2014-02-27 18:51 ` [PATCH v3] " Arnd Bergmann
2014-02-27 20:23 ` David Miller
2014-02-26 11:01 ` [PATCH 11/16] atm: firestream: fix interruptible_sleep_on race Arnd Bergmann
2014-02-26 21:08 ` David Miller
2014-02-26 11:01 ` [PATCH 12/16] isdn: pcbit: " Arnd Bergmann
2014-02-26 21:08 ` David Miller
2014-02-26 11:01 ` [PATCH 13/16] isdn: hisax/elsa: fix sleep_on race in elsa FSM Arnd Bergmann
2014-02-26 21:08 ` David Miller
2014-02-26 11:01 ` [PATCH 14/16] isdn: divert, hysdn: fix interruptible_sleep_on race Arnd Bergmann
2014-02-26 21:08 ` David Miller
2014-02-26 11:01 ` [PATCH 15/16] isdn: fix multiple sleep_on races Arnd Bergmann
2014-02-26 21:08 ` David Miller
2014-02-26 11:01 ` [PATCH 16/16] NOTYET: sched: remove sleep_on() and friends Arnd Bergmann
2014-02-26 17:36 ` [PATCH 00/16] sleep_on removal, second try Jens Axboe
2014-02-27 6:37 ` Michael Schmitz
2014-02-27 11:55 ` Geert Uytterhoeven
2014-02-28 8:53 ` Karsten Keil
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