diff options
| author | Christoph Hellwig <hch@lst.de> | 2025-01-31 13:03:47 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-01-31 07:20:08 -0700 |
| commit | 1e1a9cecfab3f22ebef0a976f849c87be8d03c1c (patch) | |
| tree | 34fa7958ed94c56127aa0fc55347bb409574af3a /drivers/ufs | |
| parent | 14ef49657ff3b7156952b2eadcf2e5bafd735795 (diff) | |
block: force noio scope in blk_mq_freeze_queue
When block drivers or the core block code perform allocations with a
frozen queue, this could try to recurse into the block device to
reclaim memory and deadlock. Thus all allocations done by a process
that froze a queue need to be done without __GFP_IO and __GFP_FS.
Instead of tying to track all of them down, force a noio scope as
part of freezing the queue.
Note that nvme is a bit of a mess here due to the non-owner freezes,
and they will be addressed separately.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250131120352.1315351-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/core/ufs-sysfs.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index 796e37a1d859..3438269a5440 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -1439,6 +1439,7 @@ static ssize_t max_number_of_rtt_store(struct device *dev, struct ufs_hba *hba = dev_get_drvdata(dev); struct ufs_dev_info *dev_info = &hba->dev_info; struct scsi_device *sdev; + unsigned int memflags; unsigned int rtt; int ret; @@ -1458,14 +1459,16 @@ static ssize_t max_number_of_rtt_store(struct device *dev, ufshcd_rpm_get_sync(hba); + memflags = memalloc_noio_save(); shost_for_each_device(sdev, hba->host) - blk_mq_freeze_queue(sdev->request_queue); + blk_mq_freeze_queue_nomemsave(sdev->request_queue); ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR, QUERY_ATTR_IDN_MAX_NUM_OF_RTT, 0, 0, &rtt); shost_for_each_device(sdev, hba->host) - blk_mq_unfreeze_queue(sdev->request_queue); + blk_mq_unfreeze_queue_nomemrestore(sdev->request_queue); + memalloc_noio_restore(memflags); ufshcd_rpm_put_sync(hba); |