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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-09-23 11:42:28 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-10-01 21:27:31 -0700 |
| commit | 4a47d3a1ff10e564bf04f27ac14552df64f60cdf (patch) | |
| tree | 403bdc848fc11049bd20ecb565f701a4d1f3f5c3 | |
| parent | 0b41d6ca616ddeb3b6c0a80e8770b6f53cd42806 (diff) | |
| download | linux-stable-4a47d3a1ff10e564bf04f27ac14552df64f60cdf.tar.gz linux-stable-4a47d3a1ff10e564bf04f27ac14552df64f60cdf.tar.bz2 linux-stable-4a47d3a1ff10e564bf04f27ac14552df64f60cdf.zip | |
vhost/scsi: Use GFP_ATOMIC with percpu_ida_alloc for obtaining tag
Fix GFP_KERNEL -> GFP_ATOMIC usage of percpu_ida_alloc() within
vhost_scsi_get_tag(), as this code is expected to be called directly
from interrupt context.
v2 changes:
- Handle possible tag < 0 failure with GFP_ATOMIC
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Asias He <asias@redhat.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/vhost/scsi.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 592b31698fc8..ce5221fa393a 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -728,7 +728,12 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq, } se_sess = tv_nexus->tvn_se_sess; - tag = percpu_ida_alloc(&se_sess->sess_tag_pool, GFP_KERNEL); + tag = percpu_ida_alloc(&se_sess->sess_tag_pool, GFP_ATOMIC); + if (tag < 0) { + pr_err("Unable to obtain tag for tcm_vhost_cmd\n"); + return ERR_PTR(-ENOMEM); + } + cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag]; sg = cmd->tvc_sgl; pages = cmd->tvc_upages; |