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| author |   Tony Lindgren <tony@atomide.com> | 2012-02-20 10:11:08 -0800 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2012-02-20 10:11:08 -0800 |
| commit | 856c5403462419eff9a7891efeee7bddc2a08af6 (patch) | |
| tree | 2f4bb681e10ec1f895600fa0a4b0b177dadf6fb4 /mm/backing-dev.c | |
| parent | Merge branch 'for_3.3/fixes/pm' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into fixes (diff) | |
| parent | ARM: OMAP: Fix build error when mmc_omap is built as module (diff) | |
| download | wireguard-linux-856c5403462419eff9a7891efeee7bddc2a08af6.tar.xz wireguard-linux-856c5403462419eff9a7891efeee7bddc2a08af6.zip | |
Merge branch 'fixes-mmc' into fixes
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 7ba8feae11b8..dd8e2aafb07e 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -318,7 +318,7 @@ static void wakeup_timer_fn(unsigned long data) if (bdi->wb.task) { trace_writeback_wake_thread(bdi); wake_up_process(bdi->wb.task); - } else { + } else if (bdi->dev) { /* * When bdi tasks are inactive for long time, they are killed. * In this case we have to wake-up the forker thread which @@ -584,6 +584,8 @@ EXPORT_SYMBOL(bdi_register_dev); */ static void bdi_wb_shutdown(struct backing_dev_info *bdi) { + struct task_struct *task; + if (!bdi_cap_writeback_dirty(bdi)) return; @@ -602,8 +604,13 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi) * Finally, kill the kernel thread. We don't need to be RCU * safe anymore, since the bdi is gone from visibility. */ - if (bdi->wb.task) - kthread_stop(bdi->wb.task); + spin_lock_bh(&bdi->wb_lock); + task = bdi->wb.task; + bdi->wb.task = NULL; + spin_unlock_bh(&bdi->wb_lock); + + if (task) + kthread_stop(task); } /* @@ -623,7 +630,9 @@ static void bdi_prune_sb(struct backing_dev_info *bdi) void bdi_unregister(struct backing_dev_info *bdi) { - if (bdi->dev) { + struct device *dev = bdi->dev; + + if (dev) { bdi_set_min_ratio(bdi, 0); trace_writeback_bdi_unregister(bdi); bdi_prune_sb(bdi); @@ -632,8 +641,12 @@ void bdi_unregister(struct backing_dev_info *bdi) if (!bdi_cap_flush_forker(bdi)) bdi_wb_shutdown(bdi); bdi_debug_unregister(bdi); - device_unregister(bdi->dev); + + spin_lock_bh(&bdi->wb_lock); bdi->dev = NULL; + spin_unlock_bh(&bdi->wb_lock); + + device_unregister(dev); } } EXPORT_SYMBOL(bdi_unregister); |