From: Mike Anderson This is a refresh of a patch by Alan Stern to correct the removal of scsi procfs host enteries http://marc.theaimsgroup.com/?l=linux-scsi&m=105545175600506&w=2 This patch also contains a join of another patch that reduces the users of scsi_host present. drivers/scsi/NCR53c406a.c | 5 ++-- drivers/scsi/aacraid/linit.c | 1 drivers/scsi/hosts.c | 4 +-- drivers/scsi/scsi_module.c | 2 - drivers/scsi/scsi_priv.h | 4 +++ drivers/scsi/scsi_proc.c | 49 ++++++++++++++++++++++++++++--------------- 6 files changed, 42 insertions(+), 23 deletions(-) diff -puN drivers/scsi/aacraid/linit.c~ppa-fix drivers/scsi/aacraid/linit.c --- 25/drivers/scsi/aacraid/linit.c~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/aacraid/linit.c 2003-07-19 17:05:05.000000000 -0700 @@ -295,7 +295,6 @@ static int aac_detect(Scsi_Host_Template printk(KERN_WARNING "aacraid: unable to register \"aac\" device.\n"); } - template->present = aac_count; /* # of cards of this type found */ return aac_count; } diff -puN drivers/scsi/hosts.c~ppa-fix drivers/scsi/hosts.c --- 25/drivers/scsi/hosts.c~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/hosts.c 2003-07-19 17:05:05.000000000 -0700 @@ -108,7 +108,7 @@ void scsi_free_shost(struct Scsi_Host *s shost->eh_notify = NULL; } - shost->hostt->present--; + scsi_proc_hostdir_rm(shost->hostt); scsi_destroy_command_freelist(shost); kfree(shost); } @@ -209,7 +209,7 @@ struct Scsi_Host *scsi_host_alloc(struct kernel_thread((int (*)(void *))scsi_error_handler, shost, 0); wait_for_completion(&complete); shost->eh_notify = NULL; - shost->hostt->present++; + scsi_proc_hostdir_add(shost->hostt); return shost; fail: kfree(shost); diff -puN drivers/scsi/NCR53c406a.c~ppa-fix drivers/scsi/NCR53c406a.c --- 25/drivers/scsi/NCR53c406a.c~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/NCR53c406a.c 2003-07-19 17:05:05.000000000 -0700 @@ -450,6 +450,7 @@ static __inline__ int NCR53c406a_pio_wri static int __init NCR53c406a_detect(Scsi_Host_Template * tpnt) { + int present = 0; struct Scsi_Host *shpnt = NULL; #ifndef PORT_BASE int i; @@ -522,7 +523,7 @@ static int __init NCR53c406a_detect(Scsi DEB(printk("NCR53c406a: using port_base 0x%x\n", port_base)); - tpnt->present = 1; + present = 1; tpnt->proc_name = "NCR53c406a"; shpnt = scsi_register(tpnt, 0); @@ -576,7 +577,7 @@ static int __init NCR53c406a_detect(Scsi sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, %s PIO mode.", port_base, irq_level, fast_pio ? "fast" : "slow"); #endif - return (tpnt->present); + return (present); #if USE_DMA err_free_irq: diff -puN drivers/scsi/scsi_module.c~ppa-fix drivers/scsi/scsi_module.c --- 25/drivers/scsi/scsi_module.c~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/scsi_module.c 2003-07-19 17:05:05.000000000 -0700 @@ -33,7 +33,7 @@ static int __init init_this_scsi_driver( INIT_LIST_HEAD(&sht->legacy_hosts); sht->detect(sht); - if (!sht->present) + if (list_empty(&sht->legacy_hosts)) return -ENODEV; list_for_each_entry(shost, &sht->legacy_hosts, sht_legacy_list) { diff -puN drivers/scsi/scsi_priv.h~ppa-fix drivers/scsi/scsi_priv.h --- 25/drivers/scsi/scsi_priv.h~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/scsi_priv.h 2003-07-19 17:05:05.000000000 -0700 @@ -90,11 +90,15 @@ extern void scsi_exit_queue(void); /* scsi_proc.c */ #ifdef CONFIG_PROC_FS +extern void scsi_proc_hostdir_add(struct scsi_host_template *); +extern void scsi_proc_hostdir_rm(struct scsi_host_template *); extern void scsi_proc_host_add(struct Scsi_Host *); extern void scsi_proc_host_rm(struct Scsi_Host *); extern int scsi_init_procfs(void); extern void scsi_exit_procfs(void); #else +# define scsi_proc_hostdir_add(sht) do { } while (0) +# define scsi_proc_hostdir_rm(sht) do { } while (0) # define scsi_proc_host_add(shost) do { } while (0) # define scsi_proc_host_rm(shost) do { } while (0) # define scsi_init_procfs() (0) diff -puN drivers/scsi/scsi_proc.c~ppa-fix drivers/scsi/scsi_proc.c --- 25/drivers/scsi/scsi_proc.c~ppa-fix 2003-07-19 17:05:05.000000000 -0700 +++ 25-akpm/drivers/scsi/scsi_proc.c 2003-07-19 17:05:05.000000000 -0700 @@ -41,6 +41,8 @@ struct proc_dir_entry *proc_scsi; EXPORT_SYMBOL(proc_scsi); +/* Protect sht->present and sht->proc_dir */ +static DECLARE_MUTEX(global_host_template_sem); static int proc_scsi_read(char *buffer, char **start, off_t offset, int length, int *eof, void *data) @@ -77,16 +79,10 @@ out: return ret; } -void scsi_proc_host_add(struct Scsi_Host *shost) +void scsi_proc_hostdir_add(struct scsi_host_template *sht) { - struct scsi_host_template *sht = shost->hostt; - struct proc_dir_entry *p; - char name[10]; - - if (!sht->proc_info) - return; - - if (!sht->proc_dir) { + down(&global_host_template_sem); + if (!sht->present++) { sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi); if (!sht->proc_dir) { printk(KERN_ERR "%s: proc_mkdir failed for %s\n", @@ -95,6 +91,27 @@ void scsi_proc_host_add(struct Scsi_Host } sht->proc_dir->owner = sht->module; } + up(&global_host_template_sem); +} + +void scsi_proc_hostdir_rm(struct scsi_host_template *sht) +{ + down(&global_host_template_sem); + if (!--sht->present && sht->proc_dir) { + remove_proc_entry(sht->proc_name, proc_scsi); + sht->proc_dir = NULL; + } + up(&global_host_template_sem); +} + +void scsi_proc_host_add(struct Scsi_Host *shost) +{ + struct scsi_host_template *sht = shost->hostt; + struct proc_dir_entry *p; + char name[10]; + + if (!sht->proc_dir) + return; sprintf(name,"%d", shost->host_no); p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR, @@ -107,20 +124,18 @@ void scsi_proc_host_add(struct Scsi_Host } p->write_proc = proc_scsi_write_proc; - p->owner = shost->hostt->module; + p->owner = sht->module; } void scsi_proc_host_rm(struct Scsi_Host *shost) { - struct scsi_host_template *sht = shost->hostt; char name[10]; - if (sht->proc_info) { - sprintf(name,"%d", shost->host_no); - remove_proc_entry(name, sht->proc_dir); - if (!sht->present) - remove_proc_entry(sht->proc_name, proc_scsi); - } + if (!shost->hostt->proc_dir) + return; + + sprintf(name,"%d", shost->host_no); + remove_proc_entry(name, shost->hostt->proc_dir); } static int proc_print_scsidevice(struct device *dev, void *data) _