On 21 August 2013 14:42, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> From 029a839ddf6f13a1e1a8bf4d4bc32b67712593ec Mon Sep 17 00:00:00 2001
> From: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> Date: Wed, 21 Aug 2013 17:30:02 +0900
> Subject: [PATCH 3/3] mmc: fix the remove of blk on suspend
>
> As mmc_cleanup_queue() is moved, NULL pointer access to card of
> mmc_queue is happened since commit fdfa20c1(mmc: reordered shutdown
> sequence mmc_bld_remove_req).
>
> Here, mmc_cleanup_queue is split into two parts.
> One is to quit the mmc_queue and two is to clean up the resource
> of mmc_queue.
>
> The following is log message related to the problem.
>
> Unable to handle kernel NULL pointer dereference at virtual address 000002a8
> pgd = ecd9c000
> [000002a8] *pgd=6d082831, *pte=00000000, *ppte=00000000
> Internal error: Oops: 17 [#1] SMP ARM
> Modules linked in: bnep rfcomm smsc95xx usbnet mii bluetooth nfsd lockd nfs_acl exportfs auth_rpcgss sunrpc oid_registry vfat fat btrfs raid6_pq xor zlib_deflate
> CPU: 3 PID: 2384 Comm: bash Not tainted 3.11.0-rc4-00869-ga7143f1-dirty #60
> task: c46d9b00 ti: ecefc000 task.ti: ecefc000
> PC is at mmc_blk_remove_req+0x58/0x88
> LR is at _raw_spin_unlock_irqrestore+0xc/0x14
> pc : [<c034e7d8>] lr : [<c0494ac8>] psr: 200f0053
> sp : ecefddf8 ip : 00000000 fp : 000dc1e8
> r10: c058ead8 r9 : ecce3f18 r8 : 00100100
> r7 : 00200200 r6 : c26b7118 r5 : 00000000 r4 : c26b1dc0
> r3 : 00000002 r2 : 00000000 r1 : 200f0053 r0 : 00000000
> Flags: nzCv IRQs on FIQs off Mode SVC_32 ISA ARM Segment user
> Control: 10c5387d Table: 6cd9c04a DAC: 00000015
> Process bash (pid: 2384, stack limit = 0xecefc240)
> Stack: (0xecefddf8 to 0xecefe000)
> <...>
> [<c034e7d8>] (mmc_blk_remove_req+0x58/0x88) from [<c03512d0>]
> (mmc_blk_remove_parts.isra.5+0x90/0xa8)
> [<c03512d0>] (mmc_blk_remove_parts.isra.5+0x90/0xa8) from
> [<c0351308>] (mmc_blk_remove+0x20/0x128)
> [<c0351308>] (mmc_blk_remove+0x20/0x128) from [<c034409c>] (mmc_bus_remove+0x18/0x20)
> [<c034409c>] (mmc_bus_remove+0x18/0x20) from [<c0265a20>] (__device_release_driver+0x7c/0xc8)
> [<c0265a20>] (__device_release_driver+0x7c/0xc8) from [<c0265a88>] (device_release_driver+0x1c/0x28)
> [<c0265a88>] (device_release_driver+0x1c/0x28) from [<c0265410>] (bus_remove_device+0x100/0x11c)
> [<c0265410>] (bus_remove_device+0x100/0x11c) from [<c0262c04>] (device_del+0x110/0x174)
> [<c0262c04>] (device_del+0x110/0x174) from [<c034463c>] (mmc_remove_card+0x64/0x78)
> [<c034463c>] (mmc_remove_card+0x64/0x78) from [<c0345124>] (mmc_remove+0x24/0x30)
> [<c0345124>] (mmc_remove+0x24/0x30) from [<c0343fb0>] (mmc_pm_notify+0x94/0xf8)
> [<c0343fb0>] (mmc_pm_notify+0x94/0xf8) from [<c00413b4>] (notifier_call_chain+0x44/0x84)
> [<c00413b4>] (notifier_call_chain+0x44/0x84) from [<c00417b4>] (__blocking_notifier_call_chain+0x48/0x60)
> [<c00417b4>] (__blocking_notifier_call_chain+0x48/0x60) from [<c00417e4>] (blocking_notifier_call_chain+0x18/0x20)
> [<c00417e4>] (blocking_notifier_call_chain+0x18/0x20) from [<c0059d48>] (pm_notifier_call_chain+0x14/0x2c)
> [<c0059d48>] (pm_notifier_call_chain+0x14/0x2c) from [<c005aa9c>] (pm_suspend+0xac/0x24c)
> [<c005aa9c>] (pm_suspend+0xac/0x24c) from [<c0059a68>] (state_store+0xb0/0xc4)
> [<c0059a68>] (state_store+0xb0/0xc4) from [<c01d610c>] (kobj_attr_store+0x14/0x20)
> [<c01d610c>] (kobj_attr_store+0x14/0x20) from [<c012b224>] (sysfs_write_file+0x118/0x164)
> [<c012b224>] (sysfs_write_file+0x118/0x164) from [<c00d59d4>] (vfs_write+0xd8/0x178)
> [<c00d59d4>] (vfs_write+0xd8/0x178) from [<c00d5d3c>] (SyS_write+0x40/0x68)
> [<c00d5d3c>] (SyS_write+0x40/0x68) from [<c000ea20>] (ret_fast_syscall+0x0/0x30)
> Code: ebfc509b e59432dc e3130002 0a000006 (e5d532a8)
>
> Reported-by: Alban Browaeys <prahal@xxxxxxxxx>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> drivers/mmc/card/block.c | 9 ++++++---
> drivers/mmc/card/queue.c | 11 ++++++++---
> drivers/mmc/card/queue.h | 1 +
> 3 files changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index cd0b7f4..1e6726d 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -2191,9 +2191,7 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md)
> * is freeing the queue that stops new requests
> * from being accepted.
> */
> - mmc_cleanup_queue(&md->queue);
> - if (md->flags & MMC_BLK_PACKED_CMD)
> - mmc_packed_clean(&md->queue);
> + mmc_quit_queue(&md->queue);
> card = md->queue.card;
> if (md->disk->flags & GENHD_FL_UP) {
> device_remove_file(disk_to_dev(md->disk), &md->force_ro);
> @@ -2204,6 +2202,11 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md)
>
> del_gendisk(md->disk);
> }
> +
> + mmc_cleanup_queue(&md->queue);
> + if (md->flags & MMC_BLK_PACKED_CMD)
> + mmc_packed_clean(&md->queue);
> +
> mmc_blk_put(md);
> }
> }
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index fa9632e..82e5550 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -318,12 +318,10 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
> return ret;
> }
>
> -void mmc_cleanup_queue(struct mmc_queue *mq)
> +void mmc_quit_queue(struct mmc_queue *mq)
> {
> struct request_queue *q = mq->queue;
> unsigned long flags;
> - struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
> - struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
>
> /* Make sure the queue isn't suspended, as that will deadlock */
> mmc_queue_resume(mq);
> @@ -336,6 +334,13 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
> q->queuedata = NULL;
> blk_start_queue(q);
> spin_unlock_irqrestore(q->queue_lock, flags);
> +}
> +EXPORT_SYMBOL(mmc_quit_queue);
> +
> +void mmc_cleanup_queue(struct mmc_queue *mq)
> +{
> + struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
> + struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
>
> kfree(mqrq_cur->bounce_sg);
> mqrq_cur->bounce_sg = NULL;
> diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
> index 5752d50..a3d89a2 100644
> --- a/drivers/mmc/card/queue.h
> +++ b/drivers/mmc/card/queue.h
> @@ -61,6 +61,7 @@ struct mmc_queue {
>
> extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
> const char *);
> +extern void mmc_quit_queue(struct mmc_queue *);
> extern void mmc_cleanup_queue(struct mmc_queue *);
> extern void mmc_queue_suspend(struct mmc_queue *);
> extern void mmc_queue_resume(struct mmc_queue *);
> --
> 1.7.0.4
>
>
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