On 2023/9/28 9:13, Douglas Gilbert wrote:
On 2023-09-22 05:28, Wenchao Hao wrote:
Create directory scsi_debug in the root of the debugfs filesystem.
Prepare to add interface for manage error injection.
Acked-by: Douglas Gilbert <[email protected]>
Signed-off-by: Wenchao Hao <[email protected]>
---
drivers/scsi/scsi_debug.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 9c0af50501f9..35c336271b13 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -41,6 +41,7 @@
#include <linux/random.h>
#include <linux/xarray.h>
#include <linux/prefetch.h>
+#include <linux/debugfs.h>
#include <net/checksum.h>
@@ -862,6 +863,8 @@ static const int device_qfull_result =
static const int condition_met_result = SAM_STAT_CONDITION_MET;
+static struct dentry *sdebug_debugfs_root;
+
/* Only do the extra work involved in logical block provisioning if one or
* more of the lbpu, lbpws or lbpws10 parameters are given and we are doing
@@ -7011,6 +7014,8 @@ static int __init scsi_debug_init(void)
goto driver_unreg;
}
+ sdebug_debugfs_root = debugfs_create_dir("scsi_debug", NULL);
debugfs_create_dir() can fail and return NULL. Looking at other drivers, most
seem to assume it will work. Since the scsi_debug driver is often used to test
abnormal situations, perhaps adding something like:
if (!sdebug_debugfs_root)
pr_info("%s: failed to create initial debugfs directory\n", __func__);
might save someone a bit of time if a NULL dereference on sdebug_debugfs_root
follows later. That is what the mpt3sas driver does.
Yes, I would fix it by checking return value of debugfs related call
after your review suggestions for other patches.
Doug Gilbert
+
for (k = 0; k < hosts_to_add; k++) {
if (want_store && k == 0) {
ret = sdebug_add_host_helper(idx);
@@ -7057,6 +7062,7 @@ static void __exit scsi_debug_exit(void)
sdebug_erase_all_stores(false);
xa_destroy(per_store_ap);
+ debugfs_remove(sdebug_debugfs_root);
}
device_initcall(scsi_debug_init);
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