diff options
| author | Grzegorz Sluja <grzegorzx.sluja@intel.com> | 2017-07-13 12:17:58 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-07-13 12:44:01 +0300 |
| commit | bbdc74dc19e09ac4e71bfb219596b3d5bc786720 (patch) | |
| tree | f364653afcbe5e287ec4675498989ee2ae293841 /drivers | |
| parent | aab2ee03912be6e12bb5f4810be0b80a82168d3e (diff) | |
| download | linux-bbdc74dc19e09ac4e71bfb219596b3d5bc786720.tar.xz | |
mmc: block: Prevent new req entering queue after its cleanup
The commit 304419d8a7e9 ("mmc: core: Allocate per-request data using the
block layer core"), refactored the mechanism of queue handling, but also
made mmc_init_request() to be called after mmc_cleanup_queue(). This
triggers a null pointer dereference:
[ 683.123791] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 683.123801] IP: mmc_init_request+0x2c/0xf0 [mmc_block]
...
[ 683.123905] Call Trace:
[ 683.123913] alloc_request_size+0x4f/0x70
[ 683.123919] mempool_alloc+0x5f/0x150
[ 683.123925] ? __enqueue_entity+0x6c/0x70
[ 683.123928] get_request+0x3ad/0x720
[ 683.123933] ? prepare_to_wait_event+0x110/0x110
[ 683.123937] blk_queue_bio+0xc1/0x3a0
[ 683.123940] generic_make_request+0xf8/0x2a0
[ 683.123942] submit_bio+0x75/0x150
[ 683.123947] submit_bio_wait+0x51/0x70
[ 683.123951] blkdev_issue_flush+0x5c/0x90
[ 683.123956] ext4_sync_fs+0x171/0x1b0
[ 683.123961] sync_filesystem+0x73/0x90
[ 683.123965] fsync_bdev+0x24/0x50
[ 683.123971] invalidate_partition+0x24/0x50
[ 683.123973] del_gendisk+0xb2/0x2a0
[ 683.123977] mmc_blk_remove_req.part.38+0x71/0xa0 [mmc_block]
[ 683.123980] mmc_blk_remove+0xba/0x190 [mmc_block]
[ 683.123990] mmc_bus_remove+0x1a/0x20 [mmc_core]
[ 683.123995] device_release_driver_internal+0x141/0x200
[ 683.123999] device_release_driver+0x12/0x20
[ 683.124001] bus_remove_device+0xfd/0x170
[ 683.124004] device_del+0x1e8/0x330
[ 683.124012] mmc_remove_card+0x60/0xc0 [mmc_core]
[ 683.124019] mmc_remove+0x19/0x30 [mmc_core]
[ 683.124025] mmc_stop_host+0xfb/0x1a0 [mmc_core]
[ 683.124032] mmc_remove_host+0x1a/0x40 [mmc_core]
[ 683.124037] sdhci_remove_host+0x2e/0x1c0 [mmc_sdhci]
[ 683.124042] sdhci_pci_remove_slot+0x3f/0x80 [sdhci_pci]
[ 683.124045] sdhci_pci_remove+0x39/0x70 [sdhci_pci]
[ 683.124049] pci_device_remove+0x39/0xc0
[ 683.124052] device_release_driver_internal+0x141/0x200
[ 683.124056] driver_detach+0x3f/0x80
[ 683.124059] bus_remove_driver+0x55/0xd0
[ 683.124062] driver_unregister+0x2c/0x50
[ 683.124065] pci_unregister_driver+0x29/0x90
[ 683.124069] sdhci_driver_exit+0x10/0x4f3 [sdhci_pci]
[ 683.124073] SyS_delete_module+0x171/0x250
[ 683.124078] entry_SYSCALL_64_fastpath+0x1e/0xa9
Fix this by setting the queue DYING flag before cleanup the queue, as it
prevents new reqs from entering the queue.
Signed-off-by: Grzegorz Sluja <grzegorzx.sluja@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Fixes: 304419d8a7e9 ("mmc: core: Allocate per-request data using the...")
[Ulf: Updated the changelog]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/block.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index e0363223996e..8ac59dc80f23 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2170,6 +2170,7 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md) * from being accepted. */ card = md->queue.card; + blk_set_queue_dying(md->queue.queue); mmc_cleanup_queue(&md->queue); if (md->disk->flags & GENHD_FL_UP) { device_remove_file(disk_to_dev(md->disk), &md->force_ro); |