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author | Michal Nazarewicz <m.nazarewicz@samsung.com> | 2010-07-05 16:38:04 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:38 -0700 |
commit | d0893264db29b9bfdb1bc66e731f4ed7f8b52795 (patch) | |
tree | b72a6637bcb4541e0e9429c0019e5f7e45805070 /drivers/usb/gadget/storage_common.c | |
parent | 1e413943fabdc228e86e4fbaa11e77efa861c23f (diff) | |
download | op-kernel-dev-d0893264db29b9bfdb1bc66e731f4ed7f8b52795.zip op-kernel-dev-d0893264db29b9bfdb1bc66e731f4ed7f8b52795.tar.gz |
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@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/storage_common.c')
-rw-r--r-- | drivers/usb/gadget/storage_common.c | 69 |
1 files changed, 48 insertions, 21 deletions
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index 04c462f..a10faec 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -57,10 +57,12 @@ #include <asm/unaligned.h> -/* Thanks to NetChip Technologies for donating this product ID. +/* + * Thanks to NetChip Technologies for donating this product ID. * * DO NOT REUSE THESE IDs with any other driver!! Ever!! - * Instead: allocate your own, using normal USB-IF procedures. */ + * Instead: allocate your own, using normal USB-IF procedures. + */ #define FSG_VENDOR_ID 0x0525 /* NetChip */ #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ @@ -84,14 +86,27 @@ #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 those 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. + * + * One could check whether those macros are already defined (which + * would indicate composite.h had been included) or not (which would + * indicate we were in FSG) but this is not done because a warning is + * desired if definitions here differ from the ones in composite.h. + * + * We want the definitions to match and be the same in File Storage + * Gadget as well as Mass Storage Function (and so composite gadgets + * using MSF). If someone changes them in composite.h it will produce + * a warning in this file when building 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 +328,11 @@ struct fsg_buffhd { enum fsg_buffer_state state; struct fsg_buffhd *next; - /* The NetChip 2280 is faster, and handles some protocol faults + /* + * 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. */ + * So we will record the intended request length here. + */ unsigned int bulk_out_intended_length; struct usb_request *inreq; @@ -395,8 +412,10 @@ 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 = { @@ -459,7 +478,7 @@ static struct usb_descriptor_header *fsg_fs_function[] = { * * That means alternate endpoint descriptors (bigger packets) * and a "device qualifier" ... plus more construction options - * for the config descriptor. + * for the configuration descriptor. */ static struct usb_endpoint_descriptor fsg_hs_bulk_in_desc = { @@ -547,8 +566,10 @@ 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 +608,10 @@ 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 +669,10 @@ 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 +753,10 @@ 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"); |