linux-kernel - Re: 2.6.18-rc5-mm1 (IDE resume regression)

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Message-Id: <200609020113.23965.rjw@sisk.pl>
Date:	Sat, 2 Sep 2006 01:13:23 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...e.de>
Subject: Re: 2.6.18-rc5-mm1 (IDE resume regression)

On Friday 01 September 2006 10:58, Andrew Morton wrote:
> 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc5/2.6.18-rc5-mm1/
> 
> 
> - CONFIG_BLOCK=n is bust due to
>   writeback_congestion_end()/blk_congestion_end() snafu.  We'll fix it later.

I need the appended patch to prevent my box from crashing during suspend to
disk (in the resume-during-suspend phase).

Apparently, the pointer returned by to_ide_driver() in generic_ide_resume()
is completely bogous, although it's nonzero, and a NULL pointer dereference
occurs when drv->resume is evaluated (100% of the time on my box).

---
 drivers/ide/ide.c |    9 +--------
 1 files changed, 1 insertion(+), 8 deletions(-)

Index: linux-2.6.18-rc5-mm1/drivers/ide/ide.c
===================================================================
--- linux-2.6.18-rc5-mm1.orig/drivers/ide/ide.c
+++ linux-2.6.18-rc5-mm1/drivers/ide/ide.c
@@ -1235,11 +1235,9 @@ static int generic_ide_suspend(struct de
 static int generic_ide_resume(struct device *dev)
 {
 	ide_drive_t *drive = dev->driver_data;
-	ide_driver_t *drv = to_ide_driver(dev->driver);
 	struct request rq;
 	struct request_pm_state rqpm;
 	ide_task_t args;
-	int err;
 
 	memset(&rq, 0, sizeof(rq));
 	memset(&rqpm, 0, sizeof(rqpm));
@@ -1250,12 +1248,7 @@ static int generic_ide_resume(struct dev
 	rqpm.pm_step = ide_pm_state_start_resume;
 	rqpm.pm_state = PM_EVENT_ON;
 
-	err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
-
-	if (err == 0 && drv->resume)
-		drv->resume(drive);
-
-	return err;
+	return ide_do_drive_cmd(drive, &rq, ide_head_wait);
 }
 
 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,

-- 
VGER BF report: H 0.0771048
-
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