[libata ahci] command completion fixes, improved debug msgs

- Fix a regression in command completion, which prevented
  the restart of the DMA engine after the device throws
  an error.
- Pack more hardware info into the port-reset error message.
- Promote "welcome to our timeout" message from debug msg
  to normal printk.

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index c710a7def7a7..894e7113e0b3 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -565,6 +565,17 @@ static void ahci_intr_error(struct ata_port *ap, u32 irq_stat)
         u32 tmp;
         int work;
 
+        printk(KERN_WARNING "ata%u: port reset, "
+               "p_is %x is %x pis %x cmd %x tf %x ss %x se %x\n",
+                ap->id,
+                irq_stat,
+                readl(mmio + HOST_IRQ_STAT),
+                readl(port_mmio + PORT_IRQ_STAT),
+                readl(port_mmio + PORT_CMD),
+                readl(port_mmio + PORT_TFDATA),
+                readl(port_mmio + PORT_SCR_STAT),
+                readl(port_mmio + PORT_SCR_ERR));
+
         /* stop DMA */
         tmp = readl(port_mmio + PORT_CMD);
         tmp &= ~PORT_CMD_START;
@@ -602,13 +613,6 @@ static void ahci_intr_error(struct ata_port *ap, u32 irq_stat)
         tmp |= PORT_CMD_START;
         writel(tmp, port_mmio + PORT_CMD);
         readl(port_mmio + PORT_CMD); /* flush */
-
-        printk(KERN_WARNING "ata%u: error occurred, port reset (%s%s%s%s)\n",
-               ap->id,
-               irq_stat & PORT_IRQ_TF_ERR ? "taskf " : "",
-               irq_stat & PORT_IRQ_HBUS_ERR ? "hbus " : "",
-               irq_stat & PORT_IRQ_HBUS_DATA_ERR ? "hbus_data " : "",
-               irq_stat & PORT_IRQ_IF_ERR ? "if " : "");
 }
 
 static void ahci_eng_timeout(struct ata_port *ap)
@@ -619,7 +623,7 @@ static void ahci_eng_timeout(struct ata_port *ap)
         struct ata_queued_cmd *qc;
         unsigned long flags;
 
-        DPRINTK("ENTER\n");
+        printk(KERN_WARNING "ata%u: handling error/timeout\n", ap->id);
 
         spin_lock_irqsave(&host_set->lock, flags);
 
@@ -672,8 +676,9 @@ static inline int ahci_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
                 else
                         err_mask = AC_ERR_HOST_BUS;
 
-                if (err_mask != AC_ERR_DEV)
-                        ahci_intr_error(ap, status);
+                /* command processing has stopped due to error; restart */
+                ahci_intr_error(ap, status);
+
                 if (qc)
                         ata_qc_complete(qc, err_mask);
         }