[PATCH ver2 printk_ratelimit] bsg: Error print if device is not bidi capable when refusing a bidi command

[Boaz Harrosh <bharrosh@panasas.com>]

If a bidi command was issued to a request_queue not mark as
QUEUE_FLAG_BIDI. Issue an error report. This is a misconfiguration
an administrator would like to know about, which is otherwise
hard to detect.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 block/bsg.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index 44a2a0f..1da14fe 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -270,6 +270,11 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
 
 	if (rw == WRITE && hdr->din_xfer_len) {
 		if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
+			if (printk_ratelimit()) {
+				printk(KERN_ERR
+					"bsg: Attempt to send a bidi command "
+					"to a none bidi device\n");
+			}
 			ret = -EOPNOTSUPP;
 			goto out;
 		}
-- 
1.6.0.1