[PATCH] Allow EA reservation holders to read from device.

[Lee Duncan <lduncan@xxxxxxxx>]

From: Lee Duncan <lduncan@xxxxxxxx>

For PGR reservation type Exclusive Access, allow all
registrants to read from the device.

Signed-off-by: Lee Duncan <lduncan@xxxxxxxx>
Cc: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
 drivers/target/target_core_pr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 85564998500a..cb762b174c08 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -551,6 +551,18 @@ static int core_scsi3_pr_seq_non_holder(

                        return 0;
                }
+       } else if (we && registered_nexus) {
+               /*
+                * Reads are allowed for Write Exclusive locks
+                * from all registrants.
+                */
+               if (cmd->data_direction == DMA_FROM_DEVICE) {
+                       pr_debug("Allowing READ CDB: 0x%02x for %s"
+                               " reservation\n", cdb[0],
+                               core_scsi3_pr_dump_type(pr_reg_type));
+
+                       return 0;
+               }
        }
        pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
                " for %s reservation\n", transport_dump_cmd_direction(cmd),
-- 
1.8.5.2

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