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mei: don't update offset in write

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commit a103af1b64d74853a5e08ca6c86aeb0e5c6ca4f1 upstream.

MEI enables writes of complete messages only
while read can be performed in parts, hence
write should not update the file offset to
not break interleaving partial reads with writes.

Cc: <stable@vger.kernel.org>
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 2018-07-09 12:21:44 +03:00 committed by Greg Kroah-Hartman
parent 6bdbaa2fdd
commit 08aee5c2c2
1 changed files with 0 additions and 1 deletions
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drivers/misc/mei/main.c
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@ -312,7 +312,6 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
}
}
*offset = 0;
cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
if (!cb) {
rets = -ENOMEM;