From 5b8909871b80a6cc2bd21aa5262c1424e3d26339 Mon Sep 17 00:00:00 2001 From: Michael Ernst Date: Wed, 7 May 2008 09:22:55 +0200 Subject: [PATCH] [S390] cio: Fix parsing mechanism for blacklisted devices. New format cssid.ssid.devno is now parsed correctly. Signed-off-by: Michael Ernst Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/blacklist.c | 324 ++++++++++++++++++----------------- 1 file changed, 170 insertions(+), 154 deletions(-) diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c index 0844476189..9c21b8f43f 100644 --- a/drivers/s390/cio/blacklist.c +++ b/drivers/s390/cio/blacklist.c @@ -19,6 +19,7 @@ #include #include +#include #include "blacklist.h" #include "cio.h" @@ -43,163 +44,169 @@ typedef enum {add, free} range_action; * Function: blacklist_range * (Un-)blacklist the devices from-to */ -static void -blacklist_range (range_action action, unsigned int from, unsigned int to, - unsigned int ssid) +static int blacklist_range(range_action action, unsigned int from_ssid, + unsigned int to_ssid, unsigned int from, + unsigned int to, int msgtrigger) { - if (!to) - to = from; - - if (from > to || to > __MAX_SUBCHANNEL || ssid > __MAX_SSID) { - printk (KERN_WARNING "cio: Invalid blacklist range " - "0.%x.%04x to 0.%x.%04x, skipping\n", - ssid, from, ssid, to); - return; + if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) { + if (msgtrigger) + printk(KERN_WARNING "cio: Invalid cio_ignore range " + "0.%x.%04x-0.%x.%04x\n", from_ssid, from, + to_ssid, to); + return 1; } - for (; from <= to; from++) { + + while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) && + (from <= to))) { if (action == add) - set_bit (from, bl_dev[ssid]); + set_bit(from, bl_dev[from_ssid]); else - clear_bit (from, bl_dev[ssid]); + clear_bit(from, bl_dev[from_ssid]); + from++; + if (from > __MAX_SUBCHANNEL) { + from_ssid++; + from = 0; + } } + + return 0; } -/* - * Function: blacklist_busid - * Get devno/busid from given string. - * Shamelessly grabbed from dasd_devmap.c. - */ -static int -blacklist_busid(char **str, int *id0, int *ssid, int *devno) +static int pure_hex(char **cp, unsigned int *val, int min_digit, + int max_digit, int max_val) { - int val, old_style; - char *sav; + int diff; + unsigned int value; - sav = *str; + diff = 0; + *val = 0; - /* check for leading '0x' */ - old_style = 0; - if ((*str)[0] == '0' && (*str)[1] == 'x') { - *str += 2; - old_style = 1; - } - if (!isxdigit((*str)[0])) /* We require at least one hex digit */ - goto confused; - val = simple_strtoul(*str, str, 16); - if (old_style || (*str)[0] != '.') { - *id0 = *ssid = 0; - if (val < 0 || val > 0xffff) - goto confused; - *devno = val; - if ((*str)[0] != ',' && (*str)[0] != '-' && - (*str)[0] != '\n' && (*str)[0] != '\0') - goto confused; - return 0; + while (isxdigit(**cp) && (diff <= max_digit)) { + + if (isdigit(**cp)) + value = **cp - '0'; + else + value = tolower(**cp) - 'a' + 10; + *val = *val * 16 + value; + (*cp)++; + diff++; } - /* New style x.y.z busid */ - if (val < 0 || val > 0xff) - goto confused; - *id0 = val; - (*str)++; - if (!isxdigit((*str)[0])) /* We require at least one hex digit */ - goto confused; - val = simple_strtoul(*str, str, 16); - if (val < 0 || val > 0xff || (*str)++[0] != '.') - goto confused; - *ssid = val; - if (!isxdigit((*str)[0])) /* We require at least one hex digit */ - goto confused; - val = simple_strtoul(*str, str, 16); - if (val < 0 || val > 0xffff) - goto confused; - *devno = val; - if ((*str)[0] != ',' && (*str)[0] != '-' && - (*str)[0] != '\n' && (*str)[0] != '\0') - goto confused; + + if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) + return 1; + return 0; -confused: - strsep(str, ",\n"); - printk(KERN_WARNING "cio: Invalid cio_ignore parameter '%s'\n", sav); - return 1; } -static int -blacklist_parse_parameters (char *str, range_action action) +static int parse_busid(char *str, int *cssid, int *ssid, int *devno, + int msgtrigger) { - int from, to, from_id0, to_id0, from_ssid, to_ssid; - - while (*str != 0 && *str != '\n') { - range_action ra = action; - while(*str == ',') - str++; - if (*str == '!') { - ra = !action; - ++str; + char *str_work; + int val, rc, ret; + + rc = 1; + + if (*str == '\0') + goto out; + + /* old style */ + str_work = str; + val = simple_strtoul(str, &str_work, 16); + + if (*str_work == '\0') { + if (val <= __MAX_SUBCHANNEL) { + *devno = val; + *ssid = 0; + *cssid = 0; + rc = 0; } + goto out; + } - /* - * Since we have to parse the proc commands and the - * kernel arguments we have to check four cases - */ - if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 || - strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) { - int j; - - str += 3; - for (j=0; j <= __MAX_SSID; j++) - blacklist_range(ra, 0, __MAX_SUBCHANNEL, j); - } else { - int rc; + /* new style */ + str_work = str; + ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); + if (ret || (str_work[0] != '\0')) + goto out; + + rc = 0; +out: + if (rc && msgtrigger) + printk(KERN_WARNING "cio: Invalid cio_ignore device '%s'\n", + str); + + return rc; +} - rc = blacklist_busid(&str, &from_id0, - &from_ssid, &from); - if (rc) - continue; - to = from; - to_id0 = from_id0; - to_ssid = from_ssid; - if (*str == '-') { - str++; - rc = blacklist_busid(&str, &to_id0, - &to_ssid, &to); - if (rc) - continue; - } - if (*str == '-') { - printk(KERN_WARNING "cio: invalid cio_ignore " - "parameter '%s'\n", - strsep(&str, ",\n")); - continue; - } - if ((from_id0 != to_id0) || - (from_ssid != to_ssid)) { - printk(KERN_WARNING "cio: invalid cio_ignore " - "range %x.%x.%04x-%x.%x.%04x\n", - from_id0, from_ssid, from, - to_id0, to_ssid, to); - continue; +static int blacklist_parse_parameters(char *str, range_action action, + int msgtrigger) +{ + int from_cssid, to_cssid, from_ssid, to_ssid, from, to; + int rc, totalrc; + char *parm; + range_action ra; + + totalrc = 0; + + while ((parm = strsep(&str, ","))) { + rc = 0; + ra = action; + if (*parm == '!') { + if (ra == add) + ra = free; + else + ra = add; + parm++; + } + if (strcmp(parm, "all") == 0) { + from_cssid = 0; + from_ssid = 0; + from = 0; + to_cssid = __MAX_CSSID; + to_ssid = __MAX_SSID; + to = __MAX_SUBCHANNEL; + } else { + rc = parse_busid(strsep(&parm, "-"), &from_cssid, + &from_ssid, &from, msgtrigger); + if (!rc) { + if (parm != NULL) + rc = parse_busid(parm, &to_cssid, + &to_ssid, &to, + msgtrigger); + else { + to_cssid = from_cssid; + to_ssid = from_ssid; + to = from; + } } - blacklist_range (ra, from, to, to_ssid); } + if (!rc) { + rc = blacklist_range(ra, from_ssid, to_ssid, from, to, + msgtrigger); + if (rc) + totalrc = 1; + } else + totalrc = 1; } - return 1; + + return totalrc; } -/* Parsing the commandline for blacklist parameters, e.g. to blacklist - * bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of: - * - cio_ignore=1234-1236 - * - cio_ignore=0x1234-0x1235,1236 - * - cio_ignore=0x1234,1235-1236 - * - cio_ignore=1236 cio_ignore=1234-0x1236 - * - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235 - * - cio_ignore=0.0.1234-0.0.1236 - * - cio_ignore=0.0.1234,0x1235,1236 - * - ... - */ static int __init blacklist_setup (char *str) { - return blacklist_parse_parameters (str, add); + CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); + if (blacklist_parse_parameters(str, add, 1)) + return 0; + return 1; } __setup ("cio_ignore=", blacklist_setup); @@ -223,27 +230,23 @@ is_blacklisted (int ssid, int devno) * Function: blacklist_parse_proc_parameters * parse the stuff which is piped to /proc/cio_ignore */ -static void -blacklist_parse_proc_parameters (char *buf) +static int blacklist_parse_proc_parameters(char *buf) { - if (strncmp (buf, "free ", 5) == 0) { - blacklist_parse_parameters (buf + 5, free); - } else if (strncmp (buf, "add ", 4) == 0) { - /* - * We don't need to check for known devices since - * css_probe_device will handle this correctly. - */ - blacklist_parse_parameters (buf + 4, add); - } else { - printk (KERN_WARNING "cio: cio_ignore: Parse error; \n" - KERN_WARNING "try using 'free all|," - ",...'\n" - KERN_WARNING "or 'add ," - ",...'\n"); - return; - } + int rc; + char *parm; + + parm = strsep(&buf, " "); + + if (strcmp("free", parm) == 0) + rc = blacklist_parse_parameters(buf, free, 0); + else if (strcmp("add", parm) == 0) + rc = blacklist_parse_parameters(buf, add, 0); + else + return 1; css_schedule_reprobe(); + + return rc; } /* Iterator struct for all devices. */ @@ -327,6 +330,8 @@ cio_ignore_write(struct file *file, const char __user *user_buf, size_t user_len, loff_t *offset) { char *buf; + size_t i; + ssize_t rc, ret; if (*offset) return -EINVAL; @@ -335,16 +340,27 @@ cio_ignore_write(struct file *file, const char __user *user_buf, buf = vmalloc (user_len + 1); /* maybe better use the stack? */ if (buf == NULL) return -ENOMEM; + memset(buf, 0, user_len + 1); + if (strncpy_from_user (buf, user_buf, user_len) < 0) { - vfree (buf); - return -EFAULT; + rc = -EFAULT; + goto out_free; } - buf[user_len] = '\0'; - blacklist_parse_proc_parameters (buf); + i = user_len - 1; + while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) { + buf[i] = '\0'; + i--; + } + ret = blacklist_parse_proc_parameters(buf); + if (ret) + rc = -EINVAL; + else + rc = user_len; +out_free: vfree (buf); - return user_len; + return rc; } static const struct seq_operations cio_ignore_proc_seq_ops = { -- 2.39.5