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Message-id: <35e07b59ee0738c2019d2b81958890a472941a0e.1277902597.git.m.nazarewicz@samsung.com>
Date: Thu, 01 Jul 2010 11:17:47 +0200
From: Michal Nazarewicz <m.nazarewicz@...sung.com>
To: linux-usb@...r.kernel.org
Cc: Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] USB: gadget: storage_common: comments updated
Updated comment to describe why printing macros are needed even
thought they are copied form the composite.h. Also, made multiline
comments follow the coding standard.
Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
---
The macros made me, the creator of the storage_common.c, wonder if they
are required and if so what for so if I had doubts clarifying them may
be especially valuable for others.
At the same time, it's purely a comment and formatting update so I
dunno if it's worth including in the kernel.
drivers/usb/gadget/storage_common.c | 60 ++++++++++++++++++++++++-----------
1 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 04c462f..557b119 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -84,14 +84,23 @@
#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
-/* Keep those macros in sync with thos in
- * include/linux/ubs/composite.h or else GCC will complain. If they
+/*
+ * Keep those macros in sync with thos in
+ * include/linux/usb/composite.h or else GCC will complain. If they
* are identical (the same names of arguments, white spaces in the
* same places) GCC will allow redefinition otherwise (even if some
- * white space is removed or added) warning will be issued. No
- * checking if those symbols is defined is performed because warning
- * is desired when those macros were defined by someone else to mean
- * something else. */
+ * white space is removed or added) warning will be issued.
+ *
+ * Those macros are needed here because File Storage Gadget does not
+ * include the composite.h header. For composite gadgets those macros
+ * are redundant since composite.h is included any way.
+ *
+ * No checking if those symbols is defined is performed because
+ * warning is desired when those macros were defined to mean something
+ * else. In particular, we want those macros do the same thing in
+ * File Storage Gadget and Mass Storage Function (and composite
+ * gadgets using MSF).
+ */
#define DBG(d, fmt, args...) dev_dbg(&(d)->gadget->dev , fmt , ## args)
#define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev , fmt , ## args)
#define ERROR(d, fmt, args...) dev_err(&(d)->gadget->dev , fmt , ## args)
@@ -313,9 +322,12 @@ struct fsg_buffhd {
enum fsg_buffer_state state;
struct fsg_buffhd *next;
- /* The NetChip 2280 is faster, and handles some protocol faults
- * better, if we don't submit any short bulk-out read requests.
- * So we will record the intended request length here. */
+ /*
+ * The NetChip 2280 is faster, and handles some protocol
+ * faults better, if we don't submit any short bulk-out read
+ * requests. So we will record the intended request length
+ * here.
+ */
unsigned int bulk_out_intended_length;
struct usb_request *inreq;
@@ -395,8 +407,10 @@ fsg_intf_desc = {
.iInterface = FSG_STRING_INTERFACE,
};
-/* Three full-speed endpoint descriptors: bulk-in, bulk-out,
- * and interrupt-in. */
+/*
+ * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
+ * interrupt-in.
+ */
static struct usb_endpoint_descriptor
fsg_fs_bulk_in_desc = {
@@ -547,8 +561,10 @@ static struct usb_gadget_strings fsg_stringtab = {
/*-------------------------------------------------------------------------*/
-/* If the next two routines are called while the gadget is registered,
- * the caller must own fsg->filesem for writing. */
+/*
+ * If the next two routines are called while the gadget is registered,
+ * the caller must own fsg->filesem for writing.
+ */
static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
{
@@ -587,8 +603,10 @@ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
goto out;
}
- /* If we can't read the file, it's no good.
- * If we can't write the file, use it read-only. */
+ /*
+ * If we can't read the file, it's no good.
+ * If we can't write the file, use it read-only.
+ */
if (!filp->f_op || !(filp->f_op->read || filp->f_op->aio_read)) {
LINFO(curlun, "file not readable: %s\n", filename);
goto out;
@@ -646,8 +664,10 @@ static void fsg_lun_close(struct fsg_lun *curlun)
/*-------------------------------------------------------------------------*/
-/* Sync the file data, don't bother with the metadata.
- * This code was copied from fs/buffer.c:sys_fdatasync(). */
+/*
+ * Sync the file data, don't bother with the metadata.
+ * This code was copied from fs/buffer.c:sys_fdatasync().
+ */
static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
{
struct file *filp = curlun->filp;
@@ -728,8 +748,10 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
if (sscanf(buf, "%d", &i) != 1)
return -EINVAL;
- /* Allow the write-enable status to change only while the backing file
- * is closed. */
+ /*
+ * Allow the write-enable status to change only while the
+ * backing file is closed.
+ */
down_read(filesem);
if (fsg_lun_is_open(curlun)) {
LDBG(curlun, "read-only status change prevented\n");
--
1.7.1
--
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