[PATCH v3 3/6] block/genhd.c: apply pm_runtime_set_memalloc_noio on block devices
From: Ming Lei <hidden>
Date: 2012-10-29 12:25:39
Also in:
linux-mm, linux-pm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
This patch applyes the introduced pm_runtime_set_memalloc_noio on block device so that PM core will teach mm to not allocate memory with GFP_IOFS when calling the runtime_resume callback for block devices. Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ming Lei <redacted> --- block/genhd.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c
index 9e02cd6..c5f10ea 100644
--- a/block/genhd.c
+++ b/block/genhd.c@@ -18,6 +18,7 @@ #include <linux/mutex.h> #include <linux/idr.h> #include <linux/log2.h> +#include <linux/pm_runtime.h> #include "blk.h"
@@ -519,6 +520,12 @@ static void register_disk(struct gendisk *disk) dev_set_name(ddev, disk->disk_name); + /* avoid probable deadlock caused by allocate memory with + * GFP_KERNEL in runtime_resume callback of its all ancestor + * deivces + */ + pm_runtime_set_memalloc_noio(ddev, true); + /* delay uevents, until we scanned partition table */ dev_set_uevent_suppress(ddev, 1);
@@ -661,6 +668,7 @@ void del_gendisk(struct gendisk *disk) disk->driverfs_dev = NULL; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); + pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); device_del(disk_to_dev(disk)); } EXPORT_SYMBOL(del_gendisk);
--
1.7.9.5
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