[PATCH] sparse: ftape

ftape got annotations and NULL noise removals.
Propagated the dependency on alpha/i386/amd64 to Kconfig (it's already
enforced by #error)
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/Kconfig

@@ -867,7 +867,7 @@ menu "Ftape, the floppy tape device driver"
 
 config FTAPE
 	tristate "Ftape (QIC-80/Travan) support"
-	depends on BROKEN_ON_SMP
+	depends on BROKEN_ON_SMP && (ALPHA || X86)
 	---help---
 	  If you have a tape drive that is connected to your floppy
 	  controller, say Y here.

drivers/char/ftape/compressor/lzrw3.c

@@ -115,13 +115,14 @@ LOCAL void compress_decompress(UBYTE *,UBYTE *,LONG, UBYTE *, ULONG *);
 /* compress a block of memory, decompress a block of memory, or to identify   */
 /* itself. For more information, see the specification file "compress.h".     */
 
-EXPORT void lzrw3_compress(action,wrk_mem,src_adr,src_len,dst_adr,p_dst_len)
-UWORD     action;      /* Action to be performed.                             */
-UBYTE   *wrk_mem;      /* Address of working memory we can use.               */
-UBYTE   *src_adr;      /* Address of input data.                              */
-LONG     src_len;      /* Length  of input data.                              */
-UBYTE   *dst_adr;      /* Address to put output data.                         */
-void  *p_dst_len;      /* Address of longword for length of output data.      */
+EXPORT void lzrw3_compress(
+	UWORD     action,      /* Action to be performed.		*/
+	UBYTE   *wrk_mem,	/* Address of working memory we can use.*/
+	UBYTE   *src_adr,	/* Address of input data.		*/
+	LONG     src_len,	/* Length  of input data.		*/
+	UBYTE   *dst_adr,	/* Address to put output data.		*/
+	void  *p_dst_len	/* Address of longword for length of output data.*/
+)
 {
  switch (action)
    {
@@ -315,8 +316,6 @@ void  *p_dst_len;      /* Address of longword for length of output data.      */
 
 /******************************************************************************/
 
-LOCAL void compress_compress
-           (p_wrk_mem,p_src_first,src_len,p_dst_first,p_dst_len)
 /* Input  : Hand over the required amount of working memory in p_wrk_mem.     */
 /* Input  : Specify input block using p_src_first and src_len.                */
 /* Input  : Point p_dst_first to the start of the output zone (OZ).           */
@@ -326,11 +325,9 @@ LOCAL void compress_compress
 /* Output : Output block in Mem[p_dst_first..p_dst_first+*p_dst_len-1]. May   */
 /* Output : write in OZ=Mem[p_dst_first..p_dst_first+src_len+MAX_CMP_GROUP-1].*/
 /* Output : Upon completion guaranteed *p_dst_len<=src_len+FLAG_BYTES.        */
-UBYTE *p_wrk_mem;
-UBYTE *p_src_first;
-ULONG  src_len;
-UBYTE *p_dst_first;
-LONG  *p_dst_len;
+LOCAL void compress_compress(UBYTE *p_wrk_mem,
+			     UBYTE *p_src_first, ULONG  src_len,
+			     UBYTE *p_dst_first, LONG  *p_dst_len)
 {
  /* p_src and p_dst step through the source and destination blocks.           */
  register UBYTE *p_src = p_src_first;
@@ -366,8 +363,8 @@ LONG  *p_dst_len;
  /* to the hash table entry corresponding to the second youngest literal.     */
  /* Note: p_h1=0=>p_h2=0 because zero values denote absence of a pending      */
  /* literal. The variables are initialized to zero meaning an empty "buffer". */
- UBYTE **p_h1=0;
- UBYTE **p_h2=0;
+ UBYTE **p_h1=NULL;
+ UBYTE **p_h2=NULL;
   
  /* To start, we write the flag bytes. Being optimistic, we set the flag to   */
  /* FLAG_COMPRESS. The remaining flag bytes are zeroed so as to keep the      */
@@ -488,9 +485,9 @@ LONG  *p_dst_len;
           /* upon the arrival of extra context bytes.                         */
           if (p_h1!=0)
             {
-             if (p_h2!=0)
-               {*p_h2=p_ziv-2; p_h2=0;}
-             *p_h1=p_ziv-1; p_h1=0;
+             if (p_h2)
+               {*p_h2=p_ziv-2; p_h2=NULL;}
+             *p_h1=p_ziv-1; p_h1=NULL;
             }
             
           /* In any case, we can update the hash table based on the current   */
@@ -564,8 +561,6 @@ LONG  *p_dst_len;
 
 /******************************************************************************/
 
-LOCAL void compress_decompress
-           (p_wrk_mem,p_src_first,src_len,p_dst_first,p_dst_len)
 /* Input  : Hand over the required amount of working memory in p_wrk_mem.     */
 /* Input  : Specify input block using p_src_first and src_len.                */
 /* Input  : Point p_dst_first to the start of the output zone.                */
@@ -576,11 +571,9 @@ LOCAL void compress_decompress
 /* Output : Length of output block written to *p_dst_len.                     */
 /* Output : Output block in Mem[p_dst_first..p_dst_first+*p_dst_len-1].       */
 /* Output : Writes only  in Mem[p_dst_first..p_dst_first+*p_dst_len-1].       */
-UBYTE *p_wrk_mem;
-UBYTE *p_src_first;
-LONG   src_len;
-UBYTE *p_dst_first;
-ULONG *p_dst_len;
+LOCAL void compress_decompress( UBYTE *p_wrk_mem,
+				UBYTE *p_src_first, LONG   src_len,
+				UBYTE *p_dst_first, ULONG *p_dst_len)
 {
  /* Byte pointers p_src and p_dst scan through the input and output blocks.   */
  register UBYTE *p_src = p_src_first+FLAG_BYTES;

drivers/char/ftape/compressor/zftape-compress.c

@@ -74,10 +74,10 @@ static unsigned int zftc_rd_compressed   = 0;
 /* forward */
 static int  zftc_write(int *write_cnt,
 		       __u8 *dst_buf, const int seg_sz,
-		       const __u8 *src_buf, const int req_len,
+		       const __u8 __user *src_buf, const int req_len,
 		       const zft_position *pos, const zft_volinfo *volume);
 static int  zftc_read(int *read_cnt,
-		      __u8  *dst_buf, const int to_do,
+		      __u8  __user *dst_buf, const int to_do,
 		      const __u8 *src_buf, const int seg_sz,
 		      const zft_position *pos, const zft_volinfo *volume);
 static int  zftc_seek(unsigned int new_block_pos, 
@@ -539,7 +539,7 @@ static int start_new_cseg(cmpr_info *cluster,
  */
 static int zftc_write(int *write_cnt,
 		      __u8 *dst_buf, const int seg_sz,
-		      const __u8 *src_buf, const int req_len,
+		      const __u8 __user *src_buf, const int req_len,
 		      const zft_position *pos, const zft_volinfo *volume)
 {
 	int req_len_left = req_len;
@@ -656,7 +656,7 @@ static int zftc_write(int *write_cnt,
  * be set to 0 
  */
 static int zftc_read (int *read_cnt, 
-		      __u8  *dst_buf, const int to_do, 
+		      __u8  __user *dst_buf, const int to_do, 
 		      const __u8 *src_buf, const int seg_sz, 
 		      const zft_position *pos, const zft_volinfo *volume)
 {          

drivers/char/ftape/lowlevel/ftape-init.c

@@ -90,7 +90,7 @@ KERN_INFO "Compiled for Linux version %s\n", UTS_RELEASE);
 	TRACE(ft_t_info, "ftape_init @ 0x%p", ftape_init);
 	/*  Allocate the DMA buffers. They are deallocated at cleanup() time.
 	 */
-#if TESTING
+#ifdef TESTING
 #ifdef MODULE
 	while (ftape_set_nr_buffers(CONFIG_FT_NR_BUFFERS) < 0) {
 		ftape_sleep(FT_SECOND/20);

drivers/char/ftape/lowlevel/ftape-proc.c

@@ -192,7 +192,7 @@ int ftape_read_proc(char *page, char **start, off_t off,
 	ptr += get_history_info(ptr);
 
 	len = strlen(page);
-	*start = 0;
+	*start = NULL;
 	if (off+count >= len) {
 		*eof = 1;
 	} else {

drivers/char/ftape/zftape/zftape-ctl.c

@@ -1319,7 +1319,7 @@ static int mtiocftcmd(struct mtftcmd *ftcmd, int arg_size)
 
 /*  IOCTL routine called by kernel-interface code
  */
-int _zft_ioctl(unsigned int command, void * arg)
+int _zft_ioctl(unsigned int command, void __user * arg)
 {
 	int result;
 	union { struct mtop       mtop;

drivers/char/ftape/zftape/zftape-ctl.h

@@ -52,7 +52,7 @@ extern int  zft_def_idle_state(void);
  */
 extern int  _zft_open(unsigned int dev_minor, unsigned int access_mode);
 extern int  _zft_close(void);
-extern int  _zft_ioctl(unsigned int command, void *arg);
+extern int  _zft_ioctl(unsigned int command, void __user *arg);
 #endif
 
 

drivers/char/ftape/zftape/zftape-init.c

@@ -88,9 +88,9 @@ static int zft_close(struct inode *ino, struct file *filep);
 static int  zft_ioctl(struct inode *ino, struct file *filep,
 		      unsigned int command, unsigned long arg);
 static int  zft_mmap(struct file *filep, struct vm_area_struct *vma);
-static ssize_t zft_read (struct file *fp, char *buff,
+static ssize_t zft_read (struct file *fp, char __user *buff,
 			 size_t req_len, loff_t *ppos);
-static ssize_t zft_write(struct file *fp, const char *buff,
+static ssize_t zft_write(struct file *fp, const char __user *buff,
 			 size_t req_len, loff_t *ppos);
 
 static struct file_operations zft_cdev =
@@ -177,7 +177,7 @@ static int zft_ioctl(struct inode *ino, struct file *filep,
 	old_sigmask = current->blocked; /* save mask */
 	sigfillset(&current->blocked);
 	/* This will work as long as sizeof(void *) == sizeof(long) */
-	result = _zft_ioctl(command, (void *) arg);
+	result = _zft_ioctl(command, (void __user *) arg);
 	current->blocked = old_sigmask; /* restore mask */
 	TRACE_EXIT result;
 }
@@ -211,7 +211,7 @@ static int  zft_mmap(struct file *filep, struct vm_area_struct *vma)
 
 /*      Read from floppy tape device
  */
-static ssize_t zft_read(struct file *fp, char *buff,
+static ssize_t zft_read(struct file *fp, char __user *buff,
 			size_t req_len, loff_t *ppos)
 {
 	int result = -EIO;
@@ -234,7 +234,7 @@ static ssize_t zft_read(struct file *fp, char *buff,
 
 /*      Write to tape device
  */
-static ssize_t zft_write(struct file *fp, const char *buff,
+static ssize_t zft_write(struct file *fp, const char __user *buff,
 			 size_t req_len, loff_t *ppos)
 {
 	int result = -EIO;

drivers/char/ftape/zftape/zftape-init.h

@@ -52,10 +52,10 @@ extern const  ftape_info *zft_status; /* needed for zftape-vtbl.h */
 struct zft_cmpr_ops {
 	int (*write)(int *write_cnt,
 		     __u8 *dst_buf, const int seg_sz,
-		     const __u8 *src_buf, const int req_len, 
+		     const __u8 __user *src_buf, const int req_len, 
 		     const zft_position *pos, const zft_volinfo *volume);
 	int (*read)(int *read_cnt,
-		    __u8 *dst_buf, const int req_len,
+		    __u8 __user *dst_buf, const int req_len,
 		    const __u8 *src_buf, const int seg_sz,
 		    const zft_position *pos, const zft_volinfo *volume);
 	int (*seek)(unsigned int new_block_pos,

drivers/char/ftape/zftape/zftape-read.c

@@ -154,7 +154,7 @@ int zft_fetch_segment_fraction(const unsigned int segment, void *buffer,
  * amount of data actually * copied to the user-buffer
  */
 static int zft_simple_read (int *read_cnt, 
-			    __u8  *dst_buf, 
+			    __u8  __user *dst_buf, 
 			    const int to_do, 
 			    const __u8 *src_buf, 
 			    const int seg_sz, 
@@ -252,7 +252,7 @@ static int check_read_access(int *req_len,
  * req_len: how much data should be read at most.
  * volume: contains information on current volume (blk_sz etc.)
  */  
-static int empty_deblock_buf(__u8 *usr_buf, const int req_len,
+static int empty_deblock_buf(__u8 __user *usr_buf, const int req_len,
 			     const __u8 *src_buf, const int seg_sz,
 			     zft_position *pos,
 			     const zft_volinfo *volume)
@@ -293,7 +293,7 @@ static int empty_deblock_buf(__u8 *usr_buf, const int req_len,
  * use small block-sizes. The block-size may be 1kb (SECTOR_SIZE). In
  * this case a MTFSR 28 maybe still inside the same segment.
  */
-int _zft_read(char* buff, int req_len)
+int _zft_read(char __user *buff, int req_len)
 {
 	int req_clipped;
 	int result     = 0;

drivers/char/ftape/zftape/zftape-read.h

@@ -48,6 +48,6 @@ extern int  zft_fetch_segment_fraction(const unsigned int segment,
 				   0, FT_SEGMENT_SIZE)
 /*   hook for the VFS interface
  */
-extern int  _zft_read(char* buff, int req_len);
+extern int  _zft_read(char __user *buff, int req_len);
 
 #endif /* _ZFTAPE_READ_H */

drivers/char/ftape/zftape/zftape-write.c

@@ -303,7 +303,7 @@ int zft_flush_buffers(void)
  */
 static int zft_simple_write(int *cnt,
 			    __u8 *dst_buf, const int seg_sz,
-			    const __u8 *src_buf, const int req_len, 
+			    const __u8 __user *src_buf, const int req_len, 
 			    const zft_position *pos,const zft_volinfo *volume)
 {
 	int space_left;
@@ -379,7 +379,7 @@ static int check_write_access(int req_len,
 
 static int fill_deblock_buf(__u8 *dst_buf, const int seg_sz,
 			    zft_position *pos, const zft_volinfo *volume,
-			    const char *usr_buf, const int req_len)
+			    const char __user *usr_buf, const int req_len)
 {
 	int cnt = 0;
 	int result = 0;
@@ -420,7 +420,7 @@ static int fill_deblock_buf(__u8 *dst_buf, const int seg_sz,
 
 /*  called by the kernel-interface routine "zft_write()"
  */
-int _zft_write(const char* buff, int req_len)
+int _zft_write(const char __user *buff, int req_len)
 {
 	int result = 0;
 	int written = 0;

drivers/char/ftape/zftape/zftape-write.h

@@ -34,5 +34,5 @@ extern void zft_prevent_flush(void);
 
 /*  hook for the VFS interface 
  */
-extern int _zft_write(const char *buff, int req_len);
+extern int _zft_write(const char __user *buff, int req_len);
 #endif /* _ZFTAPE_WRITE_H */

include/linux/mtio.h

@@ -204,7 +204,7 @@ struct mtftseg
 	unsigned mt_segno;   /* the segment to read or write */
 	unsigned mt_mode;    /* modes for read/write (sync/async etc.) */
 	int      mt_result;  /* result of r/w request, not of the ioctl */
-	void    *mt_data;    /* User space buffer: must be 29kb */
+	void    __user *mt_data;    /* User space buffer: must be 29kb */
 };
 
 /* get tape capacity (ftape/zftape)