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-rw-r--r--block/bsg.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/block/bsg.c b/block/bsg.c
index f20d6a7..0c8b64a 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -250,6 +250,14 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
int ret, rw;
unsigned int dxfer_len;
void *dxferp = NULL;
+ struct bsg_class_device *bcd = &q->bsg_dev;
+
+ /* if the LLD has been removed then the bsg_unregister_queue will
+ * eventually be called and the class_dev was freed, so we can no
+ * longer use this request_queue. Return no such address.
+ */
+ if (!bcd->class_dev)
+ return ERR_PTR(-ENXIO);
dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
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