From 7c84b8b43d3d550fa6f0b57277d03f2e1bafb357 Mon Sep 17 00:00:00 2001 From: Shawn Lin Date: Tue, 25 Jul 2017 09:11:28 +0800 Subject: [PATCH] mmc: block: bypass the queue even if usage is present for hotplug The commit 304419d8a7e9 ("mmc: core: Allocate per-request data using the block layer core") refactored mechanism of queue handling caused mmc_init_request() can be called just after mmc_cleanup_queue() caused null pointer dereference. Another commit bbdc74dc19e0 ("mmc: block: Prevent new req entering queue after its cleanup") tried to fix the problem. However it actually miss one corner case. We could still reproduce the issue mentioned with these steps: (1) insert a SD card and mount it (2) hotplug it, so it will leave md->usage still be counted (3) reboot the system which will sync data and umount the card [Unable to handle kernel NULL pointer dereference at virtual address 00000000 [user pgtable: 4k pages, 48-bit VAs, pgd = ffff80007bab3000 [[0000000000000000] *pgd=000000007a828003, *pud=0000000078dce003, *pmd=000000007aab6003, *pte=0000000000000000 [Internal error: Oops: 96000007 [#1] PREEMPT SMP [Modules linked in: [CPU: 3 PID: 3507 Comm: umount Tainted: G W 4.13.0-rc1-next-20170720-00012-g9d9bf45 #33 [Hardware name: Firefly-RK3399 Board (DT) [task: ffff80007a1de200 task.stack: ffff80007a01c000 [PC is at mmc_init_request+0x14/0xc4 [LR is at alloc_request_size+0x4c/0x74 [pc : [] lr : [] pstate: 600001c5 [sp : ffff80007a01f8f0 .... [[] mmc_init_request+0x14/0xc4 [[] alloc_request_size+0x4c/0x74 [[] mempool_create_node+0xb8/0x17c [[] blk_init_rl+0x9c/0x120 [[] blkg_alloc+0x110/0x234 [[] blkg_create+0x424/0x468 [[] blkg_lookup_create+0xd8/0x14c [[] generic_make_request_checks+0x368/0x3b0 [[] generic_make_request+0x1c/0x240 So mmc_blk_put wouldn't calling blk_cleanup_queue which actually the QUEUE_FLAG_DYING and QUEUE_FLAG_BYPASS should stay. Block core expect blk_queue_bypass_{start, end} internally to bypass/drain the queue before actually dying the queue, so it didn't expose API to set the queue bypass. I think we should set QUEUE_FLAG_BYPASS whenever queue is removed, although the md->usage is still counted, as no dispatch queue could be found then. Fixes: 304419d8a7e9 ("mmc: core: Allocate per-request data using the block layer core") Signed-off-by: Shawn Lin Reviewed-by: Linus Walleij Signed-off-by: Ulf Hansson --- drivers/mmc/core/block.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 8ac59dc80f23..e5938c791330 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; + queue_flag_set(QUEUE_FLAG_BYPASS, md->queue.queue); blk_set_queue_dying(md->queue.queue); mmc_cleanup_queue(&md->queue); if (md->disk->flags & GENHD_FL_UP) { -- 2.20.1