linux-kernel - Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

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Message-Id: <1191517589.27856.5.camel@dmullis-laptop>
Date:	Thu, 04 Oct 2007 10:06:29 -0700
From:	Don Mullis <dwm@...r.net>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Pierre Ossman <drzeus@...eus.cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

That patch boots without complaint as well.

BTW, the earlier failure messages did not make it
into /var/log/messages, only the dmesg buffer.
This is with standard Ubuntu Gutsy logging levels.

 
On Thu, 2007-10-04 at 18:42 +0200, Jens Axboe wrote:
> On Thu, Oct 04 2007, Pierre Ossman wrote:
> > On Thu, 04 Oct 2007 09:19:40 -0700
> > Don Mullis <dwm@...r.net> wrote:
> > 
> > > This patch fixes the boot.
> > > 
> > 
> > Fantastic. Then will try to get this upstream then.
> 
> I already put it in the sgchain drivers part. If you could please ack
> it, that would be nice :-). I have a bunch of driver
> updates/work-arounds there.
> 
> > > > It looks like missing init of the sg list in mmc, does this work?
> > > > 
> > 
> > Jens, is this zeroing needed for each invocation, or really just once
> > to get the list in a known state?
> 
> Once should actually be enough, so you could move it to init as well.
> Don, care to verify with the below patch as well?
> 
> > Also, is chaining already upstream so Linus should have this for 2.6.23?
> 
> No, it's for 2.6.24.
> 
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index b0abc7d..a5d0354 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -153,14 +153,14 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
>  			blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
>  			blk_queue_max_segment_size(mq->queue, bouncesz);
>  
> -			mq->sg = kmalloc(sizeof(struct scatterlist),
> +			mq->sg = kzalloc(sizeof(struct scatterlist),
>  				GFP_KERNEL);
>  			if (!mq->sg) {
>  				ret = -ENOMEM;
>  				goto cleanup_queue;
>  			}
>  
> -			mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
> +			mq->bounce_sg = kzalloc(sizeof(struct scatterlist) *
>  				bouncesz / 512, GFP_KERNEL);
>  			if (!mq->bounce_sg) {
>  				ret = -ENOMEM;
> @@ -177,7 +177,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
>  		blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
>  		blk_queue_max_segment_size(mq->queue, host->max_seg_size);
>  
> -		mq->sg = kmalloc(sizeof(struct scatterlist) *
> +		mq->sg = kzalloc(sizeof(struct scatterlist) *
>  			host->max_phys_segs, GFP_KERNEL);
>  		if (!mq->sg) {
>  			ret = -ENOMEM;
> 

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