From: Shardar Shariff Md <smohammed@nvidia.com>
Date: Tue, 5 May 2015 14:17:54 +0000 (+0100)
Subject: serial: tegra: check the count and read if any from dma
X-Git-Tag: omap-for-v4.2/wakeirq-drivers-v2^2~72
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db8e78474efd5006ece9ed15d804b78ec6e70702;p=pandora-kernel.git

serial: tegra: check the count and read if any from dma

It is only necessary to read data from the dma buffer when the count
value is non-zero and hence, tegra_uart_copy_rx_to_tty() so only be
called when this is the case.

Although, this was being tested for in two places, there is a third
place where this was not tested. However, instead of adding another
if-statement prior to calling tegra_uart_copy_rx_to_tty(), move the test
inside the function.

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
[jonathanh@nvidia.com: Re-worked patch to move the check for the count
 value inside the function tegra_uart_copy_rx_to_tty(). Updated
 changelog with more commentary.]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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