tifm_7xx1: fix adapter resume function

Fixes to the adapter resume function to correctly handle all possible cases:
1. Card is removed during suspend
2. Card is inserted during suspend into previously empty socket
3. Card is replaced during suspend by same or different media type card.

Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 31 insertions, 27 deletions

diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c
index 356386904a5d..eafa5575f312 100644
--- a/drivers/misc/tifm_7xx1.c
+++ b/drivers/misc/tifm_7xx1.c
@@ -220,7 +220,8 @@ static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 static int tifm_7xx1_resume(struct pci_dev *dev)
 {
         struct tifm_adapter *fm = pci_get_drvdata(dev);
-        int cnt, rc;
+        int rc;
+        unsigned int good_sockets = 0, bad_sockets = 0;
         unsigned long flags;
         unsigned char new_ids[fm->num_sockets];
         DECLARE_COMPLETION_ONSTACK(finish_resume);
@@ -234,46 +235,49 @@ static int tifm_7xx1_resume(struct pci_dev *dev)
 
         dev_dbg(&dev->dev, "resuming host\n");
 
-        for (cnt = 0; cnt < fm->num_sockets; cnt++)
-                new_ids[cnt] = tifm_7xx1_toggle_sock_power(
-                                        tifm_7xx1_sock_addr(fm->addr, cnt));
+        for (rc = 0; rc < fm->num_sockets; rc++)
+                new_ids[rc] = tifm_7xx1_toggle_sock_power(
+                                        tifm_7xx1_sock_addr(fm->addr, rc));
         spin_lock_irqsave(&fm->lock, flags);
-        fm->socket_change_set = 0;
-        for (cnt = 0; cnt < fm->num_sockets; cnt++) {
-                if (fm->sockets[cnt]) {
-                        if (fm->sockets[cnt]->type == new_ids[cnt])
-                                fm->socket_change_set |= 1 << cnt;
-
-                        fm->sockets[cnt]->type = new_ids[cnt];
+        for (rc = 0; rc < fm->num_sockets; rc++) {
+                if (fm->sockets[rc]) {
+                        if (fm->sockets[rc]->type == new_ids[rc])
+                                good_sockets |= 1 << rc;
+                        else
+                                bad_sockets |= 1 << rc;
                 }
         }
 
         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
                fm->addr + FM_SET_INTERRUPT_ENABLE);
-        if (!fm->socket_change_set) {
-                spin_unlock_irqrestore(&fm->lock, flags);
-                return 0;
-        } else {
-                fm->socket_change_set = 0;
+        dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
+                good_sockets, bad_sockets);
+
+        fm->socket_change_set = 0;
+        if (good_sockets) {
                 fm->finish_me = &finish_resume;
                 spin_unlock_irqrestore(&fm->lock, flags);
+                rc = wait_for_completion_timeout(&finish_resume, HZ);
+                dev_dbg(&dev->dev, "wait returned %d\n", rc);
+                writel(TIFM_IRQ_FIFOMASK(good_sockets)
+                       | TIFM_IRQ_CARDMASK(good_sockets),
+                       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
+                writel(TIFM_IRQ_FIFOMASK(good_sockets)
+                       | TIFM_IRQ_CARDMASK(good_sockets),
+                       fm->addr + FM_SET_INTERRUPT_ENABLE);
+                spin_lock_irqsave(&fm->lock, flags);
+                fm->finish_me = NULL;
+                fm->socket_change_set ^= good_sockets & fm->socket_change_set;
         }
 
-        wait_for_completion_timeout(&finish_resume, HZ);
+        fm->socket_change_set |= bad_sockets;
+        if (fm->socket_change_set)
+                tifm_queue_work(&fm->media_switcher);
 
-        spin_lock_irqsave(&fm->lock, flags);
-        fm->finish_me = NULL;
-        writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
-               | TIFM_IRQ_CARDMASK(fm->socket_change_set),
-               fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
-        writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
-               | TIFM_IRQ_CARDMASK(fm->socket_change_set),
-               fm->addr + FM_SET_INTERRUPT_ENABLE);
+        spin_unlock_irqrestore(&fm->lock, flags);
         writel(TIFM_IRQ_ENABLE,
                fm->addr + FM_SET_INTERRUPT_ENABLE);
-        fm->socket_change_set = 0;
 
-        spin_unlock_irqrestore(&fm->lock, flags);
         return 0;
 }