1 files changed, 58 insertions, 23 deletions

diff --git a/drivers/scsi/mac_esp.c b/drivers/scsi/mac_esp.c
index a99f9ce6be55..c24e86f07804 100644
--- a/drivers/scsi/mac_esp.c
+++ b/drivers/scsi/mac_esp.c
@@ -53,7 +53,8 @@ struct mac_esp_priv {
         void __iomem *pdma_io;
         int error;
 };
-static struct platform_device *internal_esp, *external_esp;
+static struct platform_device *internal_pdev, *external_pdev;
+static struct esp *esp_chips[2];
 
 #define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
                                platform_get_drvdata((struct platform_device *) \
@@ -443,6 +444,32 @@ static u32 mac_esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
         return dma_len > 0xFFFF ? 0xFFFF : dma_len;
 }
 
+static irqreturn_t mac_scsi_esp_intr(int irq, void *dev_id)
+{
+        int got_intr;
+
+        /*
+         * This is an edge triggered IRQ, so we have to be careful to
+         * avoid missing a transition when it is shared by two ESP devices.
+         */
+
+        do {
+                got_intr = 0;
+                if (esp_chips[0] &&
+                    (mac_esp_read8(esp_chips[0], ESP_STATUS) & ESP_STAT_INTR)) {
+                        (void)scsi_esp_intr(irq, esp_chips[0]);
+                        got_intr = 1;
+                }
+                if (esp_chips[1] &&
+                    (mac_esp_read8(esp_chips[1], ESP_STATUS) & ESP_STAT_INTR)) {
+                        (void)scsi_esp_intr(irq, esp_chips[1]);
+                        got_intr = 1;
+                }
+        } while (got_intr);
+
+        return IRQ_HANDLED;
+}
+
 static struct esp_driver_ops mac_esp_ops = {
         .esp_write8       = mac_esp_write8,
         .esp_read8        = mac_esp_read8,
@@ -557,10 +584,16 @@ static int __devinit esp_mac_probe(struct platform_device *dev)
         }
 
         host->irq = IRQ_MAC_SCSI;
-        err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "Mac ESP",
-                          esp);
-        if (err < 0)
-                goto fail_free_priv;
+        esp_chips[dev->id] = esp;
+        mb();
+        if (esp_chips[!dev->id] == NULL) {
+                err = request_irq(host->irq, mac_scsi_esp_intr, 0,
+                                  "Mac ESP", NULL);
+                if (err < 0) {
+                        esp_chips[dev->id] = NULL;
+                        goto fail_free_priv;
+                }
+        }
 
         err = scsi_esp_register(esp, &dev->dev);
         if (err)
@@ -569,7 +602,8 @@ static int __devinit esp_mac_probe(struct platform_device *dev)
         return 0;
 
 fail_free_irq:
-        free_irq(host->irq, esp);
+        if (esp_chips[!dev->id] == NULL)
+                free_irq(host->irq, esp);
 fail_free_priv:
         kfree(mep);
 fail_free_command_block:
@@ -588,7 +622,9 @@ static int __devexit esp_mac_remove(struct platform_device *dev)
 
         scsi_esp_unregister(esp);
 
-        free_irq(irq, esp);
+        esp_chips[dev->id] = NULL;
+        if (!(esp_chips[0] || esp_chips[1]))
+                free_irq(irq, NULL);
 
         kfree(mep);
 
@@ -615,19 +651,18 @@ static int __init mac_esp_init(void)
         if (err)
                 return err;
 
-        internal_esp = platform_device_alloc(DRV_MODULE_NAME, 0);
-        if (internal_esp && platform_device_add(internal_esp)) {
-                platform_device_put(internal_esp);
-                internal_esp = NULL;
+        internal_pdev = platform_device_alloc(DRV_MODULE_NAME, 0);
+        if (internal_pdev && platform_device_add(internal_pdev)) {
+                platform_device_put(internal_pdev);
+                internal_pdev = NULL;
         }
-
-        external_esp = platform_device_alloc(DRV_MODULE_NAME, 1);
-        if (external_esp && platform_device_add(external_esp)) {
-                platform_device_put(external_esp);
-                external_esp = NULL;
+        external_pdev = platform_device_alloc(DRV_MODULE_NAME, 1);
+        if (external_pdev && platform_device_add(external_pdev)) {
+                platform_device_put(external_pdev);
+                external_pdev = NULL;
         }
 
-        if (internal_esp || external_esp) {
+        if (internal_pdev || external_pdev) {
                 return 0;
         } else {
                 platform_driver_unregister(&esp_mac_driver);
@@ -639,13 +674,13 @@ static void __exit mac_esp_exit(void)
 {
         platform_driver_unregister(&esp_mac_driver);
 
-        if (internal_esp) {
-                platform_device_unregister(internal_esp);
-                internal_esp = NULL;
+        if (internal_pdev) {
+                platform_device_unregister(internal_pdev);
+                internal_pdev = NULL;
         }
-        if (external_esp) {
-                platform_device_unregister(external_esp);
-                external_esp = NULL;
+        if (external_pdev) {
+                platform_device_unregister(external_pdev);
+                external_pdev = NULL;
         }
 }