[PATCH] shpchp - cleanup check command status

This patch cleanups codes that check the command status. For this, it
introduces a new semaphore "cmd_sem" for each controller.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 21 insertions, 4 deletions

diff --git a/drivers/pci/hotplug/shpchp_hpc.c b/drivers/pci/hotplug/shpchp_hpc.c
index ae81427e42b1..c32a1b16704f 100644
--- a/drivers/pci/hotplug/shpchp_hpc.c
+++ b/drivers/pci/hotplug/shpchp_hpc.c
@@ -231,6 +231,7 @@ static spinlock_t list_lock;
 static irqreturn_t shpc_isr(int IRQ, void *dev_id, struct pt_regs *regs);
 
 static void start_int_poll_timer(struct php_ctlr_state_s *php_ctlr, int seconds);
+static int hpc_check_cmd_status(struct controller *ctrl);
 
 /* This is the interrupt polling timeout function. */
 static void int_poll_timeout(unsigned long lphp_ctlr)
@@ -303,10 +304,13 @@ static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
         int i;
 
         DBG_ENTER_ROUTINE 
-        
+
+        mutex_lock(&slot->ctrl->cmd_lock);
+
         if (!php_ctlr) {
                 err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
-                return -1;
+                retval = -EINVAL;
+                goto out;
         }
 
         for (i = 0; i < 10; i++) {
@@ -323,7 +327,8 @@ static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
         if (cmd_status & 0x1) { 
                 /* After 1 sec and and the controller is still busy */
                 err("%s : Controller is still busy after 1 sec.\n", __FUNCTION__);
-                return -1;
+                retval = -EBUSY;
+                goto out;
         }
 
         ++t_slot;
@@ -340,6 +345,17 @@ static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
          * Wait for command completion.
          */
         retval = shpc_wait_cmd(slot->ctrl);
+        if (retval)
+                goto out;
+
+        cmd_status = hpc_check_cmd_status(slot->ctrl);
+        if (cmd_status) {
+                err("%s: Failed to issued command 0x%x (error code = %d)\n",
+                    __FUNCTION__, cmd, cmd_status);
+                retval = -EIO;
+        }
+ out:
+        mutex_unlock(&slot->ctrl->cmd_lock);
 
         DBG_LEAVE_ROUTINE 
         return retval;
@@ -1343,7 +1359,6 @@ static struct hpc_ops shpchp_hpc_ops = {
         .green_led_blink                = hpc_set_green_led_blink,
         
         .release_ctlr                   = hpc_release_ctlr,
-        .check_cmd_status               = hpc_check_cmd_status,
 };
 
 inline static int shpc_indirect_creg_read(struct controller *ctrl, int index,
@@ -1455,6 +1470,8 @@ int shpc_init(struct controller * ctrl, struct pci_dev * pdev)
         dbg("%s: php_ctlr->creg %p\n", __FUNCTION__, php_ctlr->creg);
 
         mutex_init(&ctrl->crit_sect);
+        mutex_init(&ctrl->cmd_lock);
+
         /* Setup wait queue */
         init_waitqueue_head(&ctrl->queue);