The patch titled Subject: mm: bdi: initialize bdi_min_ratio when bdi is unregistered has been added to the -mm tree. Its filename is mm-bdi-initialize-bdi_min_ratio-when-bdi-unregister.patch
This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/mm-bdi-initialize-bdi_min_ratio-wh... and later at https://ozlabs.org/~akpm/mmotm/broken-out/mm-bdi-initialize-bdi_min_ratio-wh...
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------------------------------------------------------ From: Manjong Lee mj0123.lee@samsung.com Subject: mm: bdi: initialize bdi_min_ratio when bdi is unregistered
Initialize min_ratio if it is set during bdi unregistration. This can prevent problems that may occur a when bdi is removed without resetting min_ratio.
For example. 1) insert external sdcard 2) set external sdcard's min_ratio 70 3) remove external sdcard without setting min_ratio 0 4) insert external sdcard 5) set external sdcard's min_ratio 70 << error occur(can't set)
Because when an sdcard is removed, the present bdi_min_ratio value will remain. Currently, the only way to reset bdi_min_ratio is to reboot.
Link: https://lkml.kernel.org/r/20211021161942.5983-1-mj0123.lee@samsung.com Signed-off-by: Manjong Lee mj0123.lee@samsung.com Cc: Changheun Lee nanich.lee@samsung.com Cc: Jens Axboe axboe@kernel.dk Cc: Christoph Hellwig hch@infradead.org Cc: Matthew Wilcox willy@infradead.org Cc: seunghwan.hyun@samsung.com Cc: sookwan7.kim@samsung.com Cc: yt0928.kim@samsung.com Cc: junho89.kim@samsung.com Cc: jisoo2146.oh@samsung.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/backing-dev.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/mm/backing-dev.c~mm-bdi-initialize-bdi_min_ratio-when-bdi-unregister +++ a/mm/backing-dev.c @@ -947,6 +947,11 @@ void bdi_unregister(struct backing_dev_i wb_shutdown(&bdi->wb); cgwb_bdi_unregister(bdi);
+ /* if min ratio doesn't 0, it has to set 0 before unregister */ + if (bdi->min_ratio) { + bdi_set_min_ratio(bdi, 0); + } + if (bdi->dev) { bdi_debug_unregister(bdi); device_unregister(bdi->dev); _
Patches currently in -mm which might be from mj0123.lee@samsung.com are
mm-bdi-initialize-bdi_min_ratio-when-bdi-unregister.patch