diff options
Diffstat (limited to 'drivers/block/paride/pg.c')
| -rw-r--r-- | drivers/block/paride/pg.c | 44 |
1 files changed, 29 insertions, 15 deletions
diff --git a/drivers/block/paride/pg.c b/drivers/block/paride/pg.c index 13f998aa1cd..2ce3dfd7e6b 100644 --- a/drivers/block/paride/pg.c +++ b/drivers/block/paride/pg.c @@ -130,13 +130,14 @@ #define PI_PG 4 #endif +#include <linux/types.h> /* Here are things one can override from the insmod command. Most are autoprobed by paride unless set here. Verbose is 0 by default. */ -static int verbose = 0; +static bool verbose = 0; static int major = PG_MAJOR; static char *name = PG_NAME; static int disable = 0; @@ -162,6 +163,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY}; #include <linux/pg.h> #include <linux/device.h> #include <linux/sched.h> /* current, TASK_* */ +#include <linux/mutex.h> #include <linux/jiffies.h> #include <asm/uaccess.h> @@ -192,6 +194,7 @@ module_param_array(drive3, int, NULL, 0); #define ATAPI_IDENTIFY 0x12 +static DEFINE_MUTEX(pg_mutex); static int pg_open(struct inode *inode, struct file *file); static int pg_release(struct inode *inode, struct file *file); static ssize_t pg_read(struct file *filp, char __user *buf, @@ -227,12 +230,13 @@ static struct class *pg_class; /* kernel glue structures */ -static struct file_operations pg_fops = { +static const struct file_operations pg_fops = { .owner = THIS_MODULE, .read = pg_read, .write = pg_write, .open = pg_open, .release = pg_release, + .llseek = noop_llseek, }; static void pg_init_units(void) @@ -421,7 +425,7 @@ static void xs(char *buf, char *targ, int len) for (k = 0; k < len; k++) { char c = *buf++; - if (c != ' ' || c != l) + if (c != ' ' && c != l) l = *targ++ = c; } if (l == ' ') @@ -515,12 +519,18 @@ static int pg_open(struct inode *inode, struct file *file) { int unit = iminor(inode) & 0x7f; struct pg *dev = &devices[unit]; + int ret = 0; - if ((unit >= PG_UNITS) || (!dev->present)) - return -ENODEV; + mutex_lock(&pg_mutex); + if ((unit >= PG_UNITS) || (!dev->present)) { + ret = -ENODEV; + goto out; + } - if (test_and_set_bit(0, &dev->access)) - return -EBUSY; + if (test_and_set_bit(0, &dev->access)) { + ret = -EBUSY; + goto out; + } if (dev->busy) { pg_reset(dev); @@ -533,12 +543,15 @@ static int pg_open(struct inode *inode, struct file *file) if (dev->bufptr == NULL) { clear_bit(0, &dev->access); printk("%s: buffer allocation failed\n", dev->name); - return -ENOMEM; + ret = -ENOMEM; + goto out; } file->private_data = dev; - return 0; +out: + mutex_unlock(&pg_mutex); + return ret; } static int pg_release(struct inode *inode, struct file *file) @@ -568,7 +581,7 @@ static ssize_t pg_write(struct file *filp, const char __user *buf, size_t count, if (hdr.magic != PG_MAGIC) return -EINVAL; - if (hdr.dlen > PG_MAX_DATA) + if (hdr.dlen < 0 || hdr.dlen > PG_MAX_DATA) return -EINVAL; if ((count - hs) > PG_MAX_DATA) return -EINVAL; @@ -618,6 +631,7 @@ static ssize_t pg_read(struct file *filp, char __user *buf, size_t count, loff_t if (dev->status & 0x10) return -ETIME; + memset(&hdr, 0, sizeof(hdr)); hdr.magic = PG_MAGIC; hdr.dlen = dev->dlen; copy = 0; @@ -646,14 +660,14 @@ static int __init pg_init(void) int err; if (disable){ - err = -1; + err = -EINVAL; goto out; } pg_init_units(); if (pg_detect()) { - err = -1; + err = -ENODEV; goto out; } @@ -676,8 +690,8 @@ static int __init pg_init(void) for (unit = 0; unit < PG_UNITS; unit++) { struct pg *dev = &devices[unit]; if (dev->present) - class_device_create(pg_class, NULL, MKDEV(major, unit), - NULL, "pg%u", unit); + device_create(pg_class, NULL, MKDEV(major, unit), NULL, + "pg%u", unit); } err = 0; goto out; @@ -695,7 +709,7 @@ static void __exit pg_exit(void) for (unit = 0; unit < PG_UNITS; unit++) { struct pg *dev = &devices[unit]; if (dev->present) - class_device_destroy(pg_class, MKDEV(major, unit)); + device_destroy(pg_class, MKDEV(major, unit)); } class_destroy(pg_class); unregister_chrdev(major, name); |