linux-kernel - [PATCH 04/15] s390: tape_char should update ppos instead of using file->f

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Date:	Fri, 20 Nov 2009 17:40:34 +0100
From:	Jan Blunck <jblunck@...e.de>
To:	linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, jkacur@...hat.com,
	Arnd Bergmann <arnd@...db.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Jamie Lokier <jamie@...reable.org>,
	Jan Blunck <jblunck@...e.de>
Subject: [PATCH 04/15] s390: tape_char should update ppos instead of using file->f_pos

tapechar_read()/tapechar_write() modify file->f_pos directly instead of
the ppos given to them. The VFS later updates the file->f_pos and
overwrites it with the unchanged value of ppos.

Signed-off-by: Jan Blunck <jblunck@...e.de>
---
 drivers/s390/char/tape_char.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index 31566c5..3514f6e 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -170,7 +170,7 @@ tapechar_read(struct file *filp, char __user *data, size_t count, loff_t *ppos)
 	if (rc == 0) {
 		rc = block_size - request->rescnt;
 		DBF_EVENT(6, "TCHAR:rbytes:  %x\n", rc);
-		filp->f_pos += rc;
+		*ppos += rc;
 		/* Copy data from idal buffer to user space. */
 		if (idal_buffer_to_user(device->char_data.idal_buf,
 					data, rc) != 0)
@@ -238,7 +238,7 @@ tapechar_write(struct file *filp, const char __user *data, size_t count, loff_t
 			break;
 		DBF_EVENT(6, "TCHAR:wbytes: %lx\n",
 			  block_size - request->rescnt);
-		filp->f_pos += block_size - request->rescnt;
+		*ppos += block_size - request->rescnt;
 		written += block_size - request->rescnt;
 		if (request->rescnt != 0)
 			break;
-- 
1.6.4.2

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