scsi: target: tcmu: fix error resetting qfull_time_out to default

Problem:

$ cat /sys/kernel/config/target/core/user_0/block/attrib/qfull_time_out
-1

$ echo "-1" > /sys/kernel/config/target/core/user_0/block/attrib/qfull_time_out
-bash: echo: write error: Invalid argument

Fix:

This patch will help reset qfull_time_out to its default
i.e. qfull_time_out=-1.

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Acked-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 4ad89ea71a70118dad2e5d960f89f54431a1ad67..4f26bdc3d1dc5dcc98f1942bc9ab34ee814029f1 100644 (file)
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2121,6 +2121,8 @@ static ssize_t tcmu_qfull_time_out_store(struct config_item *item,
 
        if (val >= 0) {
                udev->qfull_time_out = val * MSEC_PER_SEC;
+       } else if (val == -1) {
+               udev->qfull_time_out = val;
        } else {
                printk(KERN_ERR "Invalid qfull timeout value %d\n", val);
                return -EINVAL;