On 8/1/2022 11:27 AM, Christoph Hellwig wrote:
On Mon, Aug 01, 2022 at 12:27:13PM -0400, Ewan D. Milne wrote:
This reverts commit c814153c83a892dfd42026eaa661ae2c1f298792.
The commit c814153c83a8 "nvme-fc: fold t fc_update_appid into fc_appid_store"
changed the userspace interface, because the code that decrements "count"
to remove a trailing '\n' in the parsing results in the decremented value being
incorrectly be returned from the sysfs write. Fix this by revering the commit.
Wouldn't something like the patch below be much simpler and cleaner:
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 9987797620b6d..e24ab688f00d5 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3878,6 +3878,7 @@ static int fc_parse_cgrpid(const char *buf, u64 *id)
static ssize_t fc_appid_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
+ size_t orig_count = count;
u64 cgrp_id;
int appid_len = 0;
int cgrpid_len = 0;
@@ -3902,7 +3903,7 @@ static ssize_t fc_appid_store(struct device *dev,
ret = blkcg_set_fc_appid(app_id, cgrp_id, sizeof(app_id));
if (ret < 0)
return ret;
- return count;
+ return orig_count;
}
static DEVICE_ATTR(appid_store, 0200, NULL, fc_appid_store);
#endif /* CONFIG_BLK_CGROUP_FC_APPID */
Reviewed-by: James Smart <jsmart2021@xxxxxxxxx>
looks good on my end.
-- james
