Messages in this thread Patch in this message | | | From | Junhao He <> | Subject | [PATCH 2/3] coresight: ultrasoc-smb: simplify the code for check to_copy valid | Date | Thu, 12 Oct 2023 17:47:05 +0800 |
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We only need to check once when before using the to_copy variable to simplify the code.
Signed-off-by: Junhao He <hejunhao3@huawei.com> --- drivers/hwtracing/coresight/ultrasoc-smb.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c index b08a619d1116..e78edc3480ce 100644 --- a/drivers/hwtracing/coresight/ultrasoc-smb.c +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c @@ -127,20 +127,15 @@ static ssize_t smb_read(struct file *file, char __user *data, size_t len, struct smb_drv_data, miscdev); struct smb_data_buffer *sdb = &drvdata->sdb; struct device *dev = &drvdata->csdev->dev; - ssize_t to_copy = 0; - - if (!len) - return 0; - - if (!sdb->data_size) - return 0; - - to_copy = min(sdb->data_size, len); + ssize_t to_copy = min(sdb->data_size, len); /* Copy parts of trace data when read pointer wrap around SMB buffer */ if (sdb->buf_rdptr + to_copy > sdb->buf_size) to_copy = sdb->buf_size - sdb->buf_rdptr; + if (!to_copy) + return 0; + if (copy_to_user(data, sdb->buf_base + sdb->buf_rdptr, to_copy)) { dev_dbg(dev, "Failed to copy data to user\n"); return -EFAULT; -- 2.33.0
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