diff options
| author |   Che-Liang Chiou <clchiou@chromium.org> | 2012-02-01 09:25:35 -0800 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-02-01 09:26:18 -0800 |
| commit | 7a0a27d2ce38aee19a31fee8c12095f586eed393 (patch) | |
| tree | 00ee7cccdf137b8f2aa816d9421f5fbba4196662 /drivers/input/serio | |
| parent | Input: document device properties (diff) | |
| download | linux-dev-7a0a27d2ce38aee19a31fee8c12095f586eed393.tar.xz linux-dev-7a0a27d2ce38aee19a31fee8c12095f586eed393.zip | |
Input: serio_raw - return proper result when serio_raw_read fails
serio_raw_read now returns (sometimes partially) successful number of
bytes transferred to the caller, and only returns error code to the
caller on completely failed transfers.
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/serio')
| -rw-r--r-- | drivers/input/serio/serio_raw.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c index 8250299fd64f..4494233d331a 100644 --- a/drivers/input/serio/serio_raw.c +++ b/drivers/input/serio/serio_raw.c @@ -164,7 +164,8 @@ static ssize_t serio_raw_read(struct file *file, char __user *buffer, struct serio_raw_client *client = file->private_data; struct serio_raw *serio_raw = client->serio_raw; char uninitialized_var(c); - ssize_t retval = 0; + ssize_t read = 0; + int retval; if (serio_raw->dead) return -ENODEV; @@ -180,13 +181,15 @@ static ssize_t serio_raw_read(struct file *file, char __user *buffer, if (serio_raw->dead) return -ENODEV; - while (retval < count && serio_raw_fetch_byte(serio_raw, &c)) { - if (put_user(c, buffer++)) - return -EFAULT; - retval++; + while (read < count && serio_raw_fetch_byte(serio_raw, &c)) { + if (put_user(c, buffer++)) { + retval = -EFAULT; + break; + } + read++; } - return retval; + return read ?: retval; } static ssize_t serio_raw_write(struct file *file, const char __user *buffer, |