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mei: amthif: don't copy from an empty buffer

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If empty message come from FW (buf_idx == 0) then the current code will
still try to copy data from not filled buffer to the user-space,
instead the code should behave the same as when end of a message
has been reached, clean resources and return 0

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2016-02-07 23:35:21 +02:00 committed by Greg Kroah-Hartman
parent 1f7e489a28
commit 5ba0bf476c
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/mei/amthif.c
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@ -185,7 +185,7 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
/* if the whole message will fit remove it from the list */
if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
list_del_init(&cb->list);
else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
else if (cb->buf_idx <= *offset) {
/* end of the message has been reached */
list_del_init(&cb->list);
rets = 0;