[MTD] slram driver cleanup
Add error checks to read/write functions and add an eraseblock size. Makes slram a suitable device for JFFS2. Signed-off-by: Josh Boyer <jdub@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -1,6 +1,6 @@
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/*======================================================================
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$Id: slram.c,v 1.33 2005/01/05 18:05:13 dwmw2 Exp $
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$Id: slram.c,v 1.34 2005/01/06 21:16:42 jwboyer Exp $
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This driver provides a method to access memory not used by the kernel
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itself (i.e. if the kernel commandline mem=xxx is used). To actually
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@ -50,6 +50,7 @@
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#include <linux/mtd/mtd.h>
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#define SLRAM_MAX_DEVICES_PARAMS 6 /* 3 parameters / device */
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#define SLRAM_BLK_SZ 0x4000
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#define T(fmt, args...) printk(KERN_DEBUG fmt, ## args)
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#define E(fmt, args...) printk(KERN_NOTICE fmt, ## args)
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@ -108,6 +109,9 @@ static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
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{
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slram_priv_t *priv = mtd->priv;
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if (from + len > mtd->size)
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return -EINVAL;
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*mtdbuf = priv->start + from;
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*retlen = len;
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return(0);
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@ -121,7 +125,13 @@ static int slram_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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slram_priv_t *priv = mtd->priv;
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if (from > mtd->size)
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return -EINVAL;
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if (from + len > mtd->size)
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len = mtd->size - from;
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memcpy(buf, priv->start + from, len);
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*retlen = len;
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@ -133,6 +143,9 @@ static int slram_write(struct mtd_info *mtd, loff_t to, size_t len,
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{
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slram_priv_t *priv = mtd->priv;
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if (to + len > mtd->size)
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return -EINVAL;
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memcpy(priv->start + to, buf, len);
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*retlen = len;
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@ -188,7 +201,7 @@ static int register_device(char *name, unsigned long start, unsigned long length
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(*curmtd)->mtdinfo->name = name;
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(*curmtd)->mtdinfo->size = length;
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(*curmtd)->mtdinfo->flags = MTD_CLEAR_BITS | MTD_SET_BITS |
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MTD_WRITEB_WRITEABLE | MTD_VOLATILE;
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MTD_WRITEB_WRITEABLE | MTD_VOLATILE | MTD_CAP_RAM;
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(*curmtd)->mtdinfo->erase = slram_erase;
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(*curmtd)->mtdinfo->point = slram_point;
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(*curmtd)->mtdinfo->unpoint = slram_unpoint;
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@ -196,7 +209,7 @@ static int register_device(char *name, unsigned long start, unsigned long length
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(*curmtd)->mtdinfo->write = slram_write;
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(*curmtd)->mtdinfo->owner = THIS_MODULE;
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(*curmtd)->mtdinfo->type = MTD_RAM;
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(*curmtd)->mtdinfo->erasesize = 0x0;
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(*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ;
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if (add_mtd_device((*curmtd)->mtdinfo)) {
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E("slram: Failed to register new device\n");
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@ -261,7 +274,7 @@ static int parse_cmdline(char *devname, char *szstart, char *szlength)
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}
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T("slram: devname=%s, devstart=0x%lx, devlength=0x%lx\n",
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devname, devstart, devlength);
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if ((devstart < 0) || (devlength < 0)) {
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if ((devstart < 0) || (devlength < 0) || (devlength % SLRAM_BLK_SZ != 0)) {
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E("slram: Illegal start / length parameter.\n");
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return(-EINVAL);
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}
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