From 3cb7ca39b00309c8fa819e692221e9f6c3539ecd Mon Sep 17 00:00:00 2001 From: Tony Lin Date: Thu, 17 Nov 2011 17:49:15 +0800 Subject: [PATCH] ENGR00162198 [MX6q_ARM2]filesystem: Kernel dump if unplug SD card during bonnie add pointer check before accesssing to fix following problem staErXtT 3'-efms. .(.mmcblk1p2): error: remounting filesystem read-only Unable to handle kernel NULL pointer dereference at virtual address 00000010 pgd = df334000 [00000010] *pgd=71e85831, *pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#1] PREEMPT SMP last sysfs file: /sys/devices/platform/sdhci-esdhc-imx.2/mmc_host/mmc1/ mmc1:b368/serial Modules linked in: ahci_platform ov3640_camera libahci libata CPU: 1 Not tainted (2.6.38-daily-00808-g43b3e87 #1) PC is at __mark_inode_dirty+0xc8/0x1b4 LR is at __mark_inode_dirty+0xb8/0x1b4 pc : [<800f7418>] lr : [<800f7408>] psr: 20000013 sp : df14dde0 ip : 00000062 fp : 00000000 r10: 003d2000 r9 : df14df38 r8 : 00000000 r7 : 4ec22acb r6 : 00000003 r5 : 00000000 r4 : e028c720 r3 : 00000001 r2 : 00000065 r1 : 804fe50c r0 : 00000001 Signed-off-by Tony Lin --- fs/fs-writeback.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index fe190a8b0bc8..5df6157e5bce 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -1082,6 +1082,8 @@ void __mark_inode_dirty(struct inode *inode, int flags) if (!was_dirty) { bool wakeup_bdi = false; bdi = inode_to_bdi(inode); + if (!bdi) + goto out; if (bdi_cap_writeback_dirty(bdi)) { WARN(!test_bit(BDI_registered, &bdi->state), -- 2.39.5