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| author |   Damien Le Moal <damien.lemoal@wdc.com> | 2019-11-08 17:29:01 +0900 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-11-08 21:37:24 -0500 |
| commit | 0eccce866f84db2cd23e1f28737920aa7b9e70d7 (patch) | |
| tree | 7d80a39d9a4ca71f3bc793a6cac715a434fbf90d /drivers/target | |
| parent | scsi: core: Fix scsi_get/set_resid() interface (diff) | |
| download | linux-dev-0eccce866f84db2cd23e1f28737920aa7b9e70d7.tar.xz linux-dev-0eccce866f84db2cd23e1f28737920aa7b9e70d7.zip | |
scsi: target: tcmu: Prevent memory reclaim recursion
Prevent recursion into the IO path under low memory conditions by using
GFP_NOIO in place of GFP_KERNEL when allocating a new command with
tcmu_alloc_cmd() and user ring space with tcmu_get_empty_block().
Link: https://lore.kernel.org/r/20191108082901.417950-1-damien.lemoal@wdc.com
Reported-by: Masato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Acked-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_user.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 35be1be87d2a..0b9dfa6b17bc 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -499,7 +499,7 @@ static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, schedule_delayed_work(&tcmu_unmap_work, 0); /* try to get new page from the mm */ - page = alloc_page(GFP_KERNEL); + page = alloc_page(GFP_NOIO); if (!page) goto err_alloc; @@ -573,7 +573,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) struct tcmu_dev *udev = TCMU_DEV(se_dev); struct tcmu_cmd *tcmu_cmd; - tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); + tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); if (!tcmu_cmd) return NULL; @@ -584,7 +584,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) tcmu_cmd_reset_dbi_cur(tcmu_cmd); tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), - GFP_KERNEL); + GFP_NOIO); if (!tcmu_cmd->dbi) { kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); return NULL; |