From: Ingo Molnar Date: Wed, 2 Jan 2008 16:25:34 +0000 (+0100) Subject: scsi: revert "[SCSI] Get rid of scsi_cmnd->done" X-Git-Tag: v2.6.24-rc7~17 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac40532ef0b8649e6f7f83859ea0de1c4ed08a19;p=linux-2.6 scsi: revert "[SCSI] Get rid of scsi_cmnd->done" This reverts commit 6f5391c283d7fdcf24bf40786ea79061919d1e1d ("[SCSI] Get rid of scsi_cmnd->done") that was supposed to be a cleanup commit, but apparently it causes regressions: Bug 9370 - v2.6.24-rc2-409-g9418d5d: attempt to access beyond end of device http://bugzilla.kernel.org/show_bug.cgi?id=9370 this patch should be reintroduced in a more split-up form to make testing of it easier. Signed-off-by: Ingo Molnar Acked-by: Matthew Wilcox Cc: James Bottomley Signed-off-by: Linus Torvalds --- diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 0fb1709ce5..7ceb8209e5 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -59,7 +59,6 @@ #include #include #include -#include #include #include #include @@ -368,8 +367,9 @@ void scsi_log_send(struct scsi_cmnd *cmd) scsi_print_command(cmd); if (level > 3) { printk(KERN_INFO "buffer = 0x%p, bufflen = %d," - " queuecommand 0x%p\n", + " done = 0x%p, queuecommand 0x%p\n", scsi_sglist(cmd), scsi_bufflen(cmd), + cmd->done, cmd->device->host->hostt->queuecommand); } @@ -654,12 +654,6 @@ void __scsi_done(struct scsi_cmnd *cmd) blk_complete_request(rq); } -/* Move this to a header if it becomes more generally useful */ -static struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) -{ - return *(struct scsi_driver **)cmd->request->rq_disk->private_data; -} - /* * Function: scsi_finish_command * @@ -671,8 +665,6 @@ void scsi_finish_command(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; struct Scsi_Host *shost = sdev->host; - struct scsi_driver *drv; - unsigned int good_bytes; scsi_device_unbusy(sdev); @@ -698,13 +690,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd) "Notifying upper driver of completion " "(result %x)\n", cmd->result)); - good_bytes = cmd->request_bufflen; - if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { - drv = scsi_cmd_to_driver(cmd); - if (drv->done) - good_bytes = drv->done(cmd); - } - scsi_io_completion(cmd, good_bytes); + cmd->done(cmd); } EXPORT_SYMBOL(scsi_finish_command); diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index ebaca4ca4a..70700b97c9 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -1699,6 +1699,7 @@ scsi_reset_provider(struct scsi_device *dev, int flag) memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd)); scmd->scsi_done = scsi_reset_provider_done_command; + scmd->done = NULL; scmd->request_buffer = NULL; scmd->request_bufflen = 0; diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 0e81e4cf88..8df8267ce3 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1092,6 +1092,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) } scsi_end_request(cmd, 0, this_count, !result); } +EXPORT_SYMBOL(scsi_io_completion); /* * Function: scsi_init_io() @@ -1170,6 +1171,18 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev, return cmd; } +static void scsi_blk_pc_done(struct scsi_cmnd *cmd) +{ + BUG_ON(!blk_pc_request(cmd->request)); + /* + * This will complete the whole command with uptodate=1 so + * as far as the block layer is concerned the command completed + * successfully. Since this is a REQ_BLOCK_PC command the + * caller should check the request's errors value + */ + scsi_io_completion(cmd, cmd->request_bufflen); +} + int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd; @@ -1219,6 +1232,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) cmd->transfersize = req->data_len; cmd->allowed = req->retries; cmd->timeout_per_command = req->timeout; + cmd->done = scsi_blk_pc_done; return BLKPREP_OK; } EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd); diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index eff0059518..ee8efe849b 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -68,7 +68,6 @@ extern int scsi_maybe_unblock_host(struct scsi_device *sdev); extern void scsi_device_unbusy(struct scsi_device *sdev); extern int scsi_queue_insert(struct scsi_cmnd *cmd, int reason); extern void scsi_next_command(struct scsi_cmnd *cmd); -extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); extern void scsi_run_host_queues(struct Scsi_Host *shost); extern struct request_queue *scsi_alloc_queue(struct scsi_device *sdev); extern void scsi_free_queue(struct request_queue *q); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index a69b155f39..cb85296d53 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -86,19 +86,6 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); -static int sd_revalidate_disk(struct gendisk *); -static int sd_probe(struct device *); -static int sd_remove(struct device *); -static void sd_shutdown(struct device *); -static int sd_suspend(struct device *, pm_message_t state); -static int sd_resume(struct device *); -static void sd_rescan(struct device *); -static int sd_done(struct scsi_cmnd *); -static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); -static void scsi_disk_release(struct class_device *cdev); -static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); -static void sd_print_result(struct scsi_disk *, int); - static DEFINE_IDR(sd_index_idr); static DEFINE_SPINLOCK(sd_index_lock); @@ -253,7 +240,6 @@ static struct scsi_driver sd_template = { .shutdown = sd_shutdown, }, .rescan = sd_rescan, - .done = sd_done, }; /* @@ -522,6 +508,12 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq) SCpnt->allowed = SD_MAX_RETRIES; SCpnt->timeout_per_command = timeout; + /* + * This is the completion routine we use. This is matched in terms + * of capability to this function. + */ + SCpnt->done = sd_rw_intr; + /* * This indicates that the command is ready from our end to be * queued. @@ -895,13 +887,13 @@ static struct block_device_operations sd_fops = { }; /** - * sd_done - bottom half handler: called when the lower level + * sd_rw_intr - bottom half handler: called when the lower level * driver has completed (successfully or otherwise) a scsi command. * @SCpnt: mid-level's per command structure. * * Note: potentially run from within an ISR. Must not block. **/ -static int sd_done(struct scsi_cmnd *SCpnt) +static void sd_rw_intr(struct scsi_cmnd * SCpnt) { int result = SCpnt->result; unsigned int xfer_size = SCpnt->request_bufflen; @@ -922,7 +914,7 @@ static int sd_done(struct scsi_cmnd *SCpnt) SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); if (sense_valid) { SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, - "sd_done: sb[respc,sk,asc," + "sd_rw_intr: sb[respc,sk,asc," "ascq]=%x,%x,%x,%x\n", sshdr.response_code, sshdr.sense_key, sshdr.asc, @@ -994,7 +986,7 @@ static int sd_done(struct scsi_cmnd *SCpnt) break; } out: - return good_bytes; + scsi_io_completion(SCpnt, good_bytes); } static int media_not_present(struct scsi_disk *sdkp, diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index c619990311..a0c4e13d4d 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -78,7 +78,6 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); static int sr_probe(struct device *); static int sr_remove(struct device *); -static int sr_done(struct scsi_cmnd *); static struct scsi_driver sr_template = { .owner = THIS_MODULE, @@ -87,7 +86,6 @@ static struct scsi_driver sr_template = { .probe = sr_probe, .remove = sr_remove, }, - .done = sr_done, }; static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; @@ -210,12 +208,12 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot) } /* - * sr_done is the interrupt routine for the device driver. + * rw_intr is the interrupt routine for the device driver. * - * It will be notified on the end of a SCSI read / write, and will take one + * It will be notified on the end of a SCSI read / write, and will take on * of several actions based on success or failure. */ -static int sr_done(struct scsi_cmnd *SCpnt) +static void rw_intr(struct scsi_cmnd * SCpnt) { int result = SCpnt->result; int this_count = SCpnt->request_bufflen; @@ -288,7 +286,12 @@ static int sr_done(struct scsi_cmnd *SCpnt) } } - return good_bytes; + /* + * This calls the generic completion function, now that we know + * how many actual sectors finished, and how many sectors we need + * to say have failed. + */ + scsi_io_completion(SCpnt, good_bytes); } static int sr_prep_fn(struct request_queue *q, struct request *rq) @@ -424,6 +427,12 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq) SCpnt->allowed = MAX_RETRIES; SCpnt->timeout_per_command = timeout; + /* + * This is the completion routine we use. This is matched in terms + * of capability to this function. + */ + SCpnt->done = rw_intr; + /* * This indicates that the command is ready from our end to be * queued. diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 3f47e522a1..7613c29893 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -34,6 +34,7 @@ struct scsi_cmnd { struct list_head list; /* scsi_cmnd participates in queue lists */ struct list_head eh_entry; /* entry for the host eh_cmd_q */ int eh_eflags; /* Used by error handlr */ + void (*done) (struct scsi_cmnd *); /* Mid-level done function */ /* * A SCSI Command is assigned a nonzero serial_number before passed @@ -121,6 +122,7 @@ extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); extern void scsi_put_command(struct scsi_cmnd *); extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, struct device *); +extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); extern void scsi_finish_command(struct scsi_cmnd *cmd); extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h index 1f5ca7f621..56a304709f 100644 --- a/include/scsi/scsi_driver.h +++ b/include/scsi/scsi_driver.h @@ -15,7 +15,6 @@ struct scsi_driver { struct device_driver gendrv; void (*rescan)(struct device *); - int (*done)(struct scsi_cmnd *); }; #define to_scsi_driver(drv) \ container_of((drv), struct scsi_driver, gendrv) diff --git a/include/scsi/sd.h b/include/scsi/sd.h index f7513313ef..aa1e716130 100644 --- a/include/scsi/sd.h +++ b/include/scsi/sd.h @@ -47,6 +47,19 @@ struct scsi_disk { }; #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev) +static int sd_revalidate_disk(struct gendisk *disk); +static void sd_rw_intr(struct scsi_cmnd * SCpnt); +static int sd_probe(struct device *); +static int sd_remove(struct device *); +static void sd_shutdown(struct device *dev); +static int sd_suspend(struct device *dev, pm_message_t state); +static int sd_resume(struct device *dev); +static void sd_rescan(struct device *); +static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); +static void scsi_disk_release(struct class_device *cdev); +static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); +static void sd_print_result(struct scsi_disk *, int); + #define sd_printk(prefix, sdsk, fmt, a...) \ (sdsk)->disk ? \ sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \