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authorLinus Torvalds <torvalds@linux-foundation.org>2021-06-13 12:25:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-13 12:25:33 -0700
commit331a6edb30af2b06fcc7f2bf734c6f4984b48a31 (patch)
treec84a94cd3f78ebc409d7238b721fcb13a6cc248f
parent8ecfa36cd4db3275bf3b6c6f32c7e3c6bb537de2 (diff)
parent1e0d4e6225996f05271de1ebcb1a7c9381af0b27 (diff)
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley: "Four reasonably small fixes to the core for scsi host allocation failure paths. The root problem is that we're not freeing the memory allocated by dev_set_name(), which involves a rejig of may of the free on error paths to do put_device() instead of kfree which, in turn, has several other knock on ramifications and inspection turned up a few other lurking bugs" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: scsi: core: Only put parent device if host state differs from SHOST_CREATED scsi: core: Put .shost_dev in failure path if host state changes to RUNNING scsi: core: Fix failure handling of scsi_add_host_with_dma() scsi: core: Fix error handling of scsi_host_alloc()
-rw-r--r--drivers/scsi/hosts.c47
1 files changed, 26 insertions, 21 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 697c09ef259b..cd52664920e1 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -254,12 +254,11 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
device_enable_async_suspend(&shost->shost_dev);
+ get_device(&shost->shost_gendev);
error = device_add(&shost->shost_dev);
if (error)
goto out_del_gendev;
- get_device(&shost->shost_gendev);
-
if (shost->transportt->host_size) {
shost->shost_data = kzalloc(shost->transportt->host_size,
GFP_KERNEL);
@@ -278,33 +277,36 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
if (!shost->work_q) {
error = -EINVAL;
- goto out_free_shost_data;
+ goto out_del_dev;
}
}
error = scsi_sysfs_add_host(shost);
if (error)
- goto out_destroy_host;
+ goto out_del_dev;
scsi_proc_host_add(shost);
scsi_autopm_put_host(shost);
return error;
- out_destroy_host:
- if (shost->work_q)
- destroy_workqueue(shost->work_q);
- out_free_shost_data:
- kfree(shost->shost_data);
+ /*
+ * Any host allocation in this function will be freed in
+ * scsi_host_dev_release().
+ */
out_del_dev:
device_del(&shost->shost_dev);
out_del_gendev:
+ /*
+ * Host state is SHOST_RUNNING so we have to explicitly release
+ * ->shost_dev.
+ */
+ put_device(&shost->shost_dev);
device_del(&shost->shost_gendev);
out_disable_runtime_pm:
device_disable_async_suspend(&shost->shost_gendev);
pm_runtime_disable(&shost->shost_gendev);
pm_runtime_set_suspended(&shost->shost_gendev);
pm_runtime_put_noidle(&shost->shost_gendev);
- scsi_mq_destroy_tags(shost);
fail:
return error;
}
@@ -345,7 +347,7 @@ static void scsi_host_dev_release(struct device *dev)
ida_simple_remove(&host_index_ida, shost->host_no);
- if (parent)
+ if (shost->shost_state != SHOST_CREATED)
put_device(parent);
kfree(shost);
}
@@ -388,8 +390,10 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
mutex_init(&shost->scan_mutex);
index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
- if (index < 0)
- goto fail_kfree;
+ if (index < 0) {
+ kfree(shost);
+ return NULL;
+ }
shost->host_no = index;
shost->dma_channel = 0xff;
@@ -481,7 +485,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost_printk(KERN_WARNING, shost,
"error handler thread failed to spawn, error = %ld\n",
PTR_ERR(shost->ehandler));
- goto fail_index_remove;
+ goto fail;
}
shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
@@ -490,17 +494,18 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
if (!shost->tmf_work_q) {
shost_printk(KERN_WARNING, shost,
"failed to create tmf workq\n");
- goto fail_kthread;
+ goto fail;
}
scsi_proc_hostdir_add(shost->hostt);
return shost;
+ fail:
+ /*
+ * Host state is still SHOST_CREATED and that is enough to release
+ * ->shost_gendev. scsi_host_dev_release() will free
+ * dev_name(&shost->shost_dev).
+ */
+ put_device(&shost->shost_gendev);
- fail_kthread:
- kthread_stop(shost->ehandler);
- fail_index_remove:
- ida_simple_remove(&host_index_ida, shost->host_no);
- fail_kfree:
- kfree(shost);
return NULL;
}
EXPORT_SYMBOL(scsi_host_alloc);