IB/srp: Make writing the add_target sysfs attr interruptible

Avoid that shutdown of srp_daemon is delayed if add_target_mutex is
held by another process.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index bb9d73daadfa..8ddc07123193 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -3299,7 +3299,9 @@ static ssize_t srp_create_target(struct device *dev,
          */
         scsi_host_get(target->scsi_host);
 
-        mutex_lock(&host->add_target_mutex);
+        ret = mutex_lock_interruptible(&host->add_target_mutex);
+        if (ret < 0)
+                goto put;
 
         ret = srp_parse_options(buf, target);
         if (ret)
@@ -3455,6 +3457,7 @@ connected:
 out:
         mutex_unlock(&host->add_target_mutex);
 
+put:
         scsi_host_put(target->scsi_host);
         if (ret < 0)
                 scsi_host_put(target->scsi_host);