Allow ahci port init to fail

kernel/Cargo.lock

@@ -204,7 +204,7 @@ dependencies = [
 [[package]]
 name = "isomorphic_drivers"
 version = "0.1.0"
-source = "git+https://github.com/rcore-os/isomorphic_drivers#fe4af36d5f7bf3ac32be77597ccc61fc8cf8bd98"
+source = "git+https://github.com/rcore-os/isomorphic_drivers#b6492b0759e4d6819f6591c3d29ef5ed83138531"
 dependencies = [
  "bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",

kernel/src/drivers/block/ahci.rs

@@ -43,10 +43,13 @@ impl Driver for AHCIDriver {
     }
 }
 
-pub fn init(_irq: Option<u32>, header: usize, size: usize) -> Arc<AHCIDriver> {
-    let ahci = AHCI::new(header, size);
-    let driver = Arc::new(AHCIDriver(Mutex::new(ahci)));
-    DRIVERS.write().push(driver.clone());
-    BLK_DRIVERS.write().push(driver.clone());
-    driver
+pub fn init(_irq: Option<u32>, header: usize, size: usize) -> Option<Arc<AHCIDriver>> {
+    if let Some(ahci) = AHCI::new(header, size) {
+        let driver = Arc::new(AHCIDriver(Mutex::new(ahci)));
+        DRIVERS.write().push(driver.clone());
+        BLK_DRIVERS.write().push(driver.clone());
+        Some(driver)
+    } else {
+        None
+    }
 }

kernel/src/drivers/bus/pci.rs

@@ -174,9 +174,11 @@ pub fn init_driver(dev: &PCIDevice) {
                 let irq = unsafe { enable(dev.loc) };
                 assert!(len as usize <= PAGE_SIZE);
                 let vaddr = phys_to_virt(addr as usize);
-                PCI_DRIVERS
-                    .lock()
-                    .insert(dev.loc, ahci::init(irq, vaddr, len as usize));
+                if let Some(driver) = ahci::init(irq, vaddr, len as usize) {
+                    PCI_DRIVERS
+                        .lock()
+                        .insert(dev.loc, driver);
+                }
             }
         }
         _ => {}