/* * DECnet An implementation of the DECnet protocol suite for the LINUX * operating system. DECnet is implemented using the BSD Socket * interface as the means of communication with the user level. * * DECnet sysctl support functions * * Author: Steve Whitehouse * * * Changes: * Steve Whitehouse - C99 changes and default device handling * Steve Whitehouse - Memory buffer settings, like the tcp ones * */ #include #include #include #include #include #include #include #include #include #include #include #include int decnet_debug_level; int decnet_time_wait = 30; int decnet_dn_count = 1; int decnet_di_count = 3; int decnet_dr_count = 3; int decnet_log_martians = 1; int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW; /* Reasonable defaults, I hope, based on tcp's defaults */ long sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 }; int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 }; int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 }; #ifdef CONFIG_SYSCTL extern int decnet_dst_gc_interval; static int min_decnet_time_wait[] = { 5 }; static int max_decnet_time_wait[] = { 600 }; static int min_state_count[] = { 1 }; static int max_state_count[] = { NSP_MAXRXTSHIFT }; static int min_decnet_dst_gc_interval[] = { 1 }; static int max_decnet_dst_gc_interval[] = { 60 }; static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW }; static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW }; static char node_name[7] = "???"; static struct ctl_table_header *dn_table_header = NULL; /* * ctype.h :-) */ #define ISNUM(x) (((x) >= '0') && ((x) <= '9')) #define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z')) #define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z')) #define ISALPHA(x) (ISLOWER(x) || ISUPPER(x)) #define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x)) static void strip_it(char *str) { for(;;) { switch (*str) { case ' ': case '\n': case '\r': case ':': *str = 0; /* Fallthrough */ case 0: return; } str++; } } /* * Simple routine to parse an ascii DECnet address * into a network order address. */ static int parse_addr(__le16 *addr, char *str) { __u16 area, node; while(*str && !ISNUM(*str)) str++; if (*str == 0) return -1; area = (*str++ - '0'); if (ISNUM(*str)) { area *= 10; area += (*str++ - '0'); } if (*str++ != '.') return -1; if (!ISNUM(*str)) return -1; node = *str++ - '0'; if (ISNUM(*str)) { node *= 10; node += (*str++ - '0'); } if (ISNUM(*str)) { node *= 10; node += (*str++ - '0'); } if (ISNUM(*str)) { node *= 10; node += (*str++ - '0'); } if ((node > 1023) || (area > 63)) return -1; if (INVALID_END_CHAR(*str)) return -1; *addr = cpu_to_le16((area << 10) | node); return 0; } static int dn_node_address_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { char addr[DN_ASCBUF_LEN]; size_t len; __le16 dnaddr; if (!*lenp || (*ppos && !write)) { *lenp = 0; return 0; } if (write) { len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1); if (copy_from_user(addr, buffer, len)) return -EFAULT; addr[len] = 0; strip_it(addr); if (parse_addr(&dnaddr, addr)) return -EINVAL; dn_dev_devices_off(); decnet_address = dnaddr; dn_dev_devices_on(); *ppos += len; return 0; } dn_addr2asc(le16_to_cpu(decnet_address), addr); len = strlen(addr); addr[len++] = '\n'; if (len > *lenp) len = *lenp; if (copy_to_user(buffer, addr, len)) return -EFAULT; *lenp = len; *ppos += len; return 0; } static int dn_def_dev_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { size_t len; struct net_device *dev; char devname[17]; if (!*lenp || (*ppos && !write)) { *lenp = 0; return 0; } if (write) { if (*lenp > 16) return -E2BIG; if (copy_from_user(devname, buffer, *lenp)) return -EFAULT; devname[*lenp] = 0; strip_it(devname); dev = dev_get_by_name(&init_net, devname); if (dev == NULL) return -ENODEV; if (dev->dn_ptr == NULL) { dev_put(dev); return -ENODEV; } if (dn_dev_set_default(dev, 1)) { dev_put(dev); return -ENODEV; } *ppos += *lenp; return 0; } dev = dn_dev_get_default(); if (dev == NULL) { *lenp = 0; return 0; } strcpy(devname, dev->name); dev_put(dev); len = strlen(devname); devname[len++] = '\n'; if (len > *lenp) len = *lenp; if (copy_to_user(buffer, devname, len)) return -EFAULT; *lenp = len; *ppos += len; return 0; } static struct ctl_table dn_table[] = { { .procname = "node_address", .maxlen = 7, .mode = 0644, .proc_handler = dn_node_address_handler, }, { .procname = "node_name", .data = node_name, .maxlen = 7, .mode = 0644, .proc_handler = proc_dostring, }, { .procname = "default_device", .maxlen = 16, .mode = 0644, .proc_handler = dn_def_dev_handler, }, { .procname = "time_wait", .data = &decnet_time_wait, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_decnet_time_wait, .extra2 = &max_decnet_time_wait }, { .procname = "dn_count", .data = &decnet_dn_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .procname = "di_count", .data = &decnet_di_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .procname = "dr_count", .data = &decnet_dr_count, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_state_count, .extra2 = &max_state_count }, { .procname = "dst_gc_interval", .data = &decnet_dst_gc_interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_decnet_dst_gc_interval, .extra2 = &max_decnet_dst_gc_interval }, { .procname = "no_fc_max_cwnd", .data = &decnet_no_fc_max_cwnd, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = &min_decnet_no_fc_max_cwnd, .extra2 = &max_decnet_no_fc_max_cwnd }, { .procname = "decnet_mem", .data = &sysctl_decnet_mem, .maxlen = sizeof(sysctl_decnet_mem), .mode = 0644, .proc_handler = proc_doulongvec_minmax }, { .procname = "decnet_rmem", .data = &sysctl_decnet_rmem, .maxlen = sizeof(sysctl_decnet_rmem), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "decnet_wmem", .data = &sysctl_decnet_wmem, .maxlen = sizeof(sysctl_decnet_wmem), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "debug", .data = &decnet_debug_level, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { } }; void dn_register_sysctl(void) { dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table); } void dn_unregister_sysctl(void) { unregister_net_sysctl_table(dn_table_header); } #else /* CONFIG_SYSCTL */ void dn_unregister_sysctl(void) { } void dn_register_sysctl(void) { } #endif ne_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/pci/emu10k1/emufx.c')