[QLOGICPTI]: Handle INQUIRY response sniffing correctly.

These days, in 2.6.x, even INQUIRY commands are sent using
scatter gather lists.

Bug reported by Tom 'spot' Callaway.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index a917ab7475acacd4583503065f10422e5fea1b7b..1fd5fc6d0fe3fb7fe1e8fb6c297fd3e9ef709a20 100644 (file)
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -1119,6 +1119,36 @@ static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int
        host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
 }
 
+static unsigned int scsi_rbuf_get(struct scsi_cmnd *cmd, unsigned char **buf_out)
+{
+       unsigned char *buf;
+       unsigned int buflen;
+
+       if (cmd->use_sg) {
+               struct scatterlist *sg;
+
+               sg = (struct scatterlist *) cmd->request_buffer;
+               buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+               buflen = sg->length;
+       } else {
+               buf = cmd->request_buffer;
+               buflen = cmd->request_bufflen;
+       }
+
+       *buf_out = buf;
+       return buflen;
+}
+
+static void scsi_rbuf_put(struct scsi_cmnd *cmd, unsigned char *buf)
+{
+       if (cmd->use_sg) {
+               struct scatterlist *sg;
+
+               sg = (struct scatterlist *) cmd->request_buffer;
+               kunmap_atomic(buf - sg->offset, KM_IRQ0);
+       }
+}
+
 /*
  * Until we scan the entire bus with inquiries, go throught this fella...
  */
@@ -1145,11 +1175,9 @@ static void ourdone(struct scsi_cmnd *Cmnd)
                int ok = host_byte(Cmnd->result) == DID_OK;
                if (Cmnd->cmnd[0] == 0x12 && ok) {
                        unsigned char *iqd;
+                       unsigned int iqd_len;
 
-                       if (Cmnd->use_sg != 0)
-                               BUG();
-
-                       iqd = ((unsigned char *)Cmnd->buffer);
+                       iqd_len = scsi_rbuf_get(Cmnd, &iqd);
 
                        /* tags handled in midlayer */
                        /* enable sync mode? */
@@ -1163,6 +1191,9 @@ static void ourdone(struct scsi_cmnd *Cmnd)
                        if (iqd[7] & 0x20) {
                                qpti->dev_param[tgt].device_flags |= 0x20;
                        }
+
+                       scsi_rbuf_put(Cmnd, iqd);
+
                        qpti->sbits |= (1 << tgt);
                } else if (!ok) {
                        qpti->sbits |= (1 << tgt);