linux-kernel - Why is the max_sectors set the 240

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Date:   Sat, 24 Sep 2016 07:08:53 +0000
From:   Lipengcheng <lpc.li@...ilicon.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "usb-storage@...ts.one-eyed-alien.net" 
        <usb-storage@...ts.one-eyed-alien.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fangzhuanghai <fangzhuanghai@...ilicon.com>,
        Caizhiyong <caizhiyong@...ilicon.com>
Subject: Why is the max_sectors set the 240

Hi,
Some special superspeed u3 disk connect xhci control. Then the u3 disk is read/write and has the Transfer error on endpoint (COMP_TX_ERR) error. However in the pc windows does not have the problem.By analysis, the windows is each transfer 64K size. The Linux is 120K size. In the scsiglue.c, the max_sectors value set the 128 and each transfer 64K size. Then the Linux system is no problem too. Why is the max_sectors set the 240?  May the max_sectors be the other values?

Best Regard
Pengcheng Li