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Message-ID: <Pine.LNX.4.62.0707191554590.8661@pademelon.sonytel.be>
Date: Thu, 19 Jul 2007 15:55:20 +0200 (CEST)
From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Andy Whitcroft <apw@...dowen.org>,
"James E.J. Bottomley" <James.Bottomley@...elEye.com>,
linux-scsi@...r.kernel.org,
Linux Kernel Development <linux-kernel@...r.kernel.org>,
Linux/PPC Development <linuxppc-dev@...abs.org>,
Paul Mackerras <paulus@...ba.org>,
Jens Axboe <jens.axboe@...cle.com>
Subject: [patch 4/4] ps3flash: updates after final review
ps3flash: updates after final review:
o Kill confusing ps3flash_priv() macro, open code it instead
o ps3flash_llseek(): Add missing locking (using i_mutex)
o Replace do_div_llr() by `/' and `%'
o ps3flash_read(): Use a common return for the error path
o Minor coding style fixes not reported by checkpatch
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
---
drivers/char/ps3flash.c | 59 ++++++++++++++++++++++++++++--------------------
1 files changed, 35 insertions(+), 24 deletions(-)
--- a/drivers/char/ps3flash.c
+++ b/drivers/char/ps3flash.c
@@ -34,7 +34,6 @@
struct ps3flash_private {
struct mutex mutex; /* Bounce buffer mutex */
};
-#define ps3flash_priv(dev) ((dev)->sbd.core.driver_data)
static struct ps3_storage_device *ps3flash_dev;
@@ -81,28 +80,35 @@ static ssize_t ps3flash_write_chunk(stru
static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
{
struct ps3_storage_device *dev = ps3flash_dev;
- u64 size = dev->regions[dev->region_idx].size*dev->blk_size;
+ loff_t res;
+ mutex_lock(&file->f_mapping->host->i_mutex);
switch (origin) {
case 1:
offset += file->f_pos;
break;
case 2:
- offset += size;
+ offset += dev->regions[dev->region_idx].size*dev->blk_size;
break;
}
- if (offset < 0)
- return -EINVAL;
+ if (offset < 0) {
+ res = -EINVAL;
+ goto out;
+ }
file->f_pos = offset;
- return file->f_pos;
+ res = file->f_pos;
+
+out:
+ mutex_unlock(&file->f_mapping->host->i_mutex);
+ return res;
}
static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
loff_t *pos)
{
struct ps3_storage_device *dev = ps3flash_dev;
- struct ps3flash_private *priv = ps3flash_priv(dev);
+ struct ps3flash_private *priv = dev->sbd.core.driver_data;
u64 size, start_sector, end_sector, offset;
ssize_t sectors_read;
size_t remaining, n;
@@ -115,15 +121,16 @@ static ssize_t ps3flash_read(struct file
if (*pos >= size || !count)
return 0;
- if (*pos+count > size) {
+ if (*pos + count > size) {
dev_dbg(&dev->sbd.core,
"%s:%u Truncating count from %zu to %llu\n", __func__,
__LINE__, count, size - *pos);
count = size - *pos;
}
- start_sector = do_div_llr(*pos, dev->blk_size, &offset);
- end_sector = DIV_ROUND_UP(*pos+count, dev->blk_size);
+ start_sector = *pos / dev->blk_size;
+ offset = *pos % dev->blk_size;
+ end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);
remaining = count;
do {
@@ -134,7 +141,7 @@ static ssize_t ps3flash_read(struct file
0);
if (sectors_read < 0) {
mutex_unlock(&priv->mutex);
- return sectors_read;
+ goto fail;
}
n = min(remaining, sectors_read*dev->blk_size-offset);
@@ -143,7 +150,8 @@ static ssize_t ps3flash_read(struct file
__func__, __LINE__, n, dev->bounce_buf+offset, buf);
if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
mutex_unlock(&priv->mutex);
- return -EFAULT;
+ sectors_read = -EFAULT;
+ goto fail;
}
mutex_unlock(&priv->mutex);
@@ -156,13 +164,16 @@ static ssize_t ps3flash_read(struct file
} while (remaining > 0);
return count;
+
+fail:
+ return sectors_read;
}
static ssize_t ps3flash_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct ps3_storage_device *dev = ps3flash_dev;
- struct ps3flash_private *priv = ps3flash_priv(dev);
+ struct ps3flash_private *priv = dev->sbd.core.driver_data;
u64 size, chunk_sectors, start_write_sector, end_write_sector,
end_read_sector, start_read_sector, head, tail, offset;
ssize_t res;
@@ -177,7 +188,7 @@ static ssize_t ps3flash_write(struct fil
if (*pos >= size || !count)
return 0;
- if (*pos+count > size) {
+ if (*pos + count > size) {
dev_dbg(&dev->sbd.core,
"%s:%u Truncating count from %zu to %llu\n", __func__,
__LINE__, count, size - *pos);
@@ -186,13 +197,13 @@ static ssize_t ps3flash_write(struct fil
chunk_sectors = dev->bounce_size / dev->blk_size;
- start_write_sector = do_div_llr(*pos, dev->bounce_size, &offset) *
- chunk_sectors;
- end_write_sector = DIV_ROUND_UP(*pos+count, dev->bounce_size) *
+ start_write_sector = *pos / dev->bounce_size * chunk_sectors;
+ offset = *pos % dev->bounce_size;
+ end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) *
chunk_sectors;
end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
- start_read_sector = (*pos+count) / dev->blk_size;
+ start_read_sector = (*pos + count) / dev->blk_size;
/*
* As we have to write in 256 KiB chunks, while we can read in blk_size
@@ -204,8 +215,8 @@ static ssize_t ps3flash_write(struct fil
* All of this is complicated by using only one 256 KiB bounce buffer.
*/
- head = end_read_sector-start_write_sector;
- tail = end_write_sector-start_read_sector;
+ head = end_read_sector - start_write_sector;
+ tail = end_write_sector - start_read_sector;
remaining = count;
do {
@@ -355,7 +366,7 @@ static int __devinit ps3flash_probe(stru
goto fail;
}
- ps3flash_priv(dev) = priv;
+ dev->sbd.core.driver_data = priv;
mutex_init(&priv->mutex);
dev->bounce_size = ps3flash_bounce_buffer.size;
@@ -381,7 +392,7 @@ fail_teardown:
ps3stor_teardown(dev);
fail_free_priv:
kfree(priv);
- ps3flash_priv(dev) = NULL;
+ dev->sbd.core.driver_data = NULL;
fail:
ps3flash_dev = NULL;
return error;
@@ -393,8 +404,8 @@ static int ps3flash_remove(struct ps3_sy
misc_deregister(&ps3flash_misc);
ps3stor_teardown(dev);
- kfree(ps3flash_priv(dev));
- ps3flash_priv(dev) = NULL;
+ kfree(dev->sbd.core.driver_data);
+ dev->sbd.core.driver_data = NULL;
ps3flash_dev = NULL;
return 0;
}
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@...ycom.com
Internet: http://www.sony-europe.com/
Sony Network and Software Technology Center Europe
A division of Sony Service Centre (Europe) N.V.
Registered office: Technologielaan 7 · B-1840 Londerzeel · Belgium
VAT BE 0413.825.160 · RPR Brussels
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