1 files changed, 38 insertions, 8 deletions

diff --git a/arch/arm/mach-sa1100/ssp.c b/arch/arm/mach-sa1100/ssp.c
index 1604dadf27fc..5eba5fbbb561 100644
--- a/arch/arm/mach-sa1100/ssp.c
+++ b/arch/arm/mach-sa1100/ssp.c
@@ -23,6 +23,8 @@
 #include <asm/hardware.h>
 #include <asm/hardware/ssp.h>
 
+#define TIMEOUT 100000
+
 static irqreturn_t ssp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
         unsigned int status = Ser4SSSR;
@@ -47,18 +49,27 @@ static irqreturn_t ssp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  * The caller is expected to perform the necessary locking.
  *
  * Returns:
- *   %-ETIMEDOUT        timeout occurred (for future)
+ *   %-ETIMEDOUT        timeout occurred
  *   0                  success
  */
 int ssp_write_word(u16 data)
 {
-        while (!(Ser4SSSR & SSSR_TNF))
+        int timeout = TIMEOUT;
+
+        while (!(Ser4SSSR & SSSR_TNF)) {
+                if (!--timeout)
+                        return -ETIMEDOUT;
                 cpu_relax();
+        }
 
         Ser4SSDR = data;
 
-        while (!(Ser4SSSR & SSSR_BSY))
+        timeout = TIMEOUT;
+        while (!(Ser4SSSR & SSSR_BSY)) {
+                if (!--timeout)
+                        return -ETIMEDOUT;
                 cpu_relax();
+        }
 
         return 0;
 }
@@ -75,15 +86,22 @@ int ssp_write_word(u16 data)
  * The caller is expected to perform the necessary locking.
  *
  * Returns:
- *   %-ETIMEDOUT        timeout occurred (for future)
+ *   %-ETIMEDOUT        timeout occurred
  *   16-bit data        success
  */
-int ssp_read_word(void)
+int ssp_read_word(u16 *data)
 {
-        while (!(Ser4SSSR & SSSR_RNE))
+        int timeout = TIMEOUT;
+
+        while (!(Ser4SSSR & SSSR_RNE)) {
+                if (!--timeout)
+                        return -ETIMEDOUT;
                 cpu_relax();
+        }
+
+        *data = (u16)Ser4SSDR;
 
-        return Ser4SSDR;
+        return 0;
 }
 
 /**
@@ -93,14 +111,26 @@ int ssp_read_word(void)
  * is empty.
  *
  * The caller is expected to perform the necessary locking.
+ *
+ * Returns:
+ *   %-ETIMEDOUT        timeout occurred
+ *   0                  success
  */
-void ssp_flush(void)
+int ssp_flush(void)
 {
+        int timeout = TIMEOUT * 2;
+
         do {
                 while (Ser4SSSR & SSSR_RNE) {
+                        if (!--timeout)
+                                return -ETIMEDOUT;
                         (void) Ser4SSDR;
                 }
+                if (!--timeout)
+                        return -ETIMEDOUT;
         } while (Ser4SSSR & SSSR_BSY);
+
+        return 0;
 }
 
 /**