diff --git a/kernel/src/drivers/irq/plic.rs b/kernel/src/drivers/irq/plic.rs
index 2e8f474..f8de629 100644
--- a/kernel/src/drivers/irq/plic.rs
+++ b/kernel/src/drivers/irq/plic.rs
@@ -4,7 +4,6 @@ use crate::entry::HART_ID;
 use crate::plat::irq::IrqController;
 use fdt::{node::FdtNode, Fdt};
 use log::trace;
-use spin::Mutex;
 
 const IRQ_OCCUPIED: usize = u32::MAX as usize; // OpenSBI will rewrite IRQ_M_EXT to this value
 const IRQ_S_EXT: usize = 9;
@@ -34,7 +33,6 @@ where IrqPlic: IrqDriver
     control:  *mut PlicCtrl,
 
     nr_irqs: usize,
-    lock:    Mutex<()>,
 }
 
 impl Driver for IrqPlic {
@@ -96,7 +94,6 @@ impl Driver for IrqPlic {
             enable:   unsafe { base_address.add(PLIC_ENABLE_OFFSET + ctx_id * PLIC_ENABLE_STRIDE) as *mut u32 },
             control:  unsafe { (base_address.add(PLIC_CONTROL_OFFSET) as *mut PlicCtrl).add(ctx_id) },
             nr_irqs:  nr_irqs.unwrap(),
-            lock:     Mutex::new(()),
         }
     }
 }
@@ -110,15 +107,9 @@ impl IrqController for IrqPlic {
         let word = irq / 32;
         let bit = irq % 32;
 
-        {
-            let guard = self.lock.lock();
-
-            let val = unsafe { self.enable.add(word).read_volatile() };
-            let val = val | (1 << bit);
-            unsafe { self.enable.add(word).write_volatile(val) };
-
-            drop(guard);
-        }
+        let val = unsafe { self.enable.add(word).read_volatile() };
+        let val = val | (1 << bit);
+        unsafe { self.enable.add(word).write_volatile(val) };
     }
 
     fn disable(&mut self, irq: usize) {
@@ -129,15 +120,9 @@ impl IrqController for IrqPlic {
         let word = irq / 32;
         let bit = irq % 32;
 
-        {
-            let guard = self.lock.lock();
-
-            let val = unsafe { self.enable.add(word).read_volatile() };
-            let val = val & !(1 << bit);
-            unsafe { self.enable.add(word).write_volatile(val) };
-
-            drop(guard);
-        }
+        let val = unsafe { self.enable.add(word).read_volatile() };
+        let val = val & !(1 << bit);
+        unsafe { self.enable.add(word).write_volatile(val) };
     }
 
     fn is_pending(&mut self, irq: usize) -> bool {