linux-kernel - [PATCH] usb gadget: remove size limitation for storage cdrom

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Date:	Sun, 8 Mar 2015 12:24:54 +0800
From:	Dave Young <dyoung@...hat.com>
To:	balbi@...com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb gadget: remove size limitation for storage cdrom

I used usb cdrom emulation to play video dvd for my daughter, but I got below
error:

[dave@...kstar tmp]$ cat /mnt/sr1/VIDEO_TS/VTS_01_5.VOB >/dev/null
cat: /mnt/sr1/VIDEO_TS/VTS_01_5.VOB: Input/output error
[dave@...kstar tmp]$ dmesg|tail -1
[ 3349.371857] sr1: rw=0, want=8028824, limit=4607996

The assumption of cdrom size is not right, we can create data dvd large then
4G, also mkisofs can create an iso with only one blank directory, the size is
less than 300 sectors. The size limit does not make sense, thus remove them. 

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 drivers/usb/gadget/function/storage_common.c |    9 ---------
 1 file changed, 9 deletions(-)

--- linux.orig/drivers/usb/gadget/function/storage_common.c
+++ linux/drivers/usb/gadget/function/storage_common.c
@@ -247,15 +247,6 @@ int fsg_lun_open(struct fsg_lun *curlun,
 
 	num_sectors = size >> blkbits; /* File size in logic-block-size blocks */
 	min_sectors = 1;
-	if (curlun->cdrom) {
-		min_sectors = 300;	/* Smallest track is 300 frames */
-		if (num_sectors >= 256*60*75) {
-			num_sectors = 256*60*75 - 1;
-			LINFO(curlun, "file too big: %s\n", filename);
-			LINFO(curlun, "using only first %d blocks\n",
-					(int) num_sectors);
-		}
-	}
 	if (num_sectors < min_sectors) {
 		LINFO(curlun, "file too small: %s\n", filename);
 		rc = -ETOOSMALL;
--
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