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USB: f_mtp: Avoid queuing of receive_file_work for 0 length

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MTP Server can issue ioctl for receive_file_work even if
xfer_length is 0. Mainly due to small files which are read
from mtp_read() itself. As there is no need to queue work
followed by flush_work in that case, add a check for same
to avoid wasting few msecs for every small file transferred.

Change-Id: I7b5395cc771c6f1ef842e787210ec02262b2b44f
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
This commit is contained in:
Manu Gautam 2019-12-17 11:33:55 +05:30
parent ee4780198e
commit 16232cca08
1 changed files with 9 additions and 6 deletions
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15
drivers/usb/gadget/function/f_mtp.c
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@ -1145,14 +1145,17 @@ static long mtp_send_receive_ioctl(struct file *fp, unsigned int code,
* in kernel context, which is necessary for vfs_read and
* vfs_write to use our buffers in the kernel address space.
*/
queue_work(dev->wq, work);
/* wait for operation to complete */
flush_workqueue(dev->wq);
fput(filp);
dev->xfer_result = 0;
if (dev->xfer_file_length) {
queue_work(dev->wq, work);
/* wait for operation to complete */
flush_workqueue(dev->wq);
/* read the result */
smp_rmb();
/* read the result */
smp_rmb();
}
ret = dev->xfer_result;
fput(filp);
fail:
spin_lock_irq(&dev->lock);