[SCSI] dc395x: atomic_kmap for PIO

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 600ba1202864..c44af5795b10 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -976,6 +976,16 @@ static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
         }
 }
 
+static inline void pio_trigger(void)
+{
+        static int feedback_requested;
+
+        if (!feedback_requested) {
+                feedback_requested = 1;
+                printk(KERN_WARNING "%s: Please, contact <linux-scsi@vger.kernel.org> "
+                       "to help improve support for your system.\n", __FILE__);
+        }
+}
 
 /* Prepare SRB for being sent to Device DCB w/ command *cmd */
 static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
@@ -2320,6 +2330,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                                               CFG2_WIDEFIFO);
                         while (DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) != 0x40) {
                                 u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
+                                pio_trigger();
                                 *(srb->virt_addr)++ = byte;
                                 if (debug_enabled(DBG_PIO))
                                         printk(" %02x", byte);
@@ -2331,6 +2342,7 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                 /* Read the last byte ... */
                                 if (srb->total_xfer_length > 0) {
                                         u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
+                                        pio_trigger();
                                         *(srb->virt_addr)++ = byte;
                                         srb->total_xfer_length--;
                                         if (debug_enabled(DBG_PIO))
@@ -2507,6 +2519,7 @@ static void data_io_transfer(struct AdapterCtlBlk *acb,
                                 if (debug_enabled(DBG_PIO))
                                         printk(" %02x", (unsigned char) *(srb->virt_addr));
 
+                                pio_trigger();
                                 DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 
                                      *(srb->virt_addr)++);