rtc: m48t59: clean up m48t59_nvram_read()/m48t59_nvram_write()

The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c

Spinlock acquisition/release is moved out of the loop body to get
atomic states of NVRAM reading and writing operations.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 90abb5bd589c..d99a705bec07 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -345,11 +345,12 @@ static ssize_t m48t59_nvram_read(struct file *filp, struct kobject *kobj,
         ssize_t cnt = 0;
         unsigned long flags;
 
-        for (; size > 0 && pos < pdata->offset; cnt++, size--) {
-                spin_lock_irqsave(&m48t59->lock, flags);
+        spin_lock_irqsave(&m48t59->lock, flags);
+
+        for (; cnt < size; cnt++)
                 *buf++ = M48T59_READ(cnt);
-                spin_unlock_irqrestore(&m48t59->lock, flags);
-        }
+
+        spin_unlock_irqrestore(&m48t59->lock, flags);
 
         return cnt;
 }
@@ -365,11 +366,12 @@ static ssize_t m48t59_nvram_write(struct file *filp, struct kobject *kobj,
         ssize_t cnt = 0;
         unsigned long flags;
 
-        for (; size > 0 && pos < pdata->offset; cnt++, size--) {
-                spin_lock_irqsave(&m48t59->lock, flags);
+        spin_lock_irqsave(&m48t59->lock, flags);
+
+        for (; cnt < size; cnt++)
                 M48T59_WRITE(*buf++, cnt);
-                spin_unlock_irqrestore(&m48t59->lock, flags);
-        }
+
+        spin_unlock_irqrestore(&m48t59->lock, flags);
 
         return cnt;
 }