From de25deb18016f66dcdede165d07654559bb332bc Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Wed, 16 Jan 2008 13:32:17 +0900 Subject: [SCSI] use dynamically allocated sense buffer This removes static array sense_buffer in scsi_cmnd and uses dynamically allocated sense_buffer (with GFP_DMA). The reason for doing this is that some architectures need cacheline aligned buffer for DMA: http://lkml.org/lkml/2007/11/19/2 The problems are that scsi_eh_prep_cmnd puts scsi_cmnd::sense_buffer to sglist and some LLDs directly DMA to scsi_cmnd::sense_buffer. It's necessary to DMA to scsi_cmnd::sense_buffer safely. This patch solves these issues. __scsi_get_command allocates sense_buffer via kmem_cache_alloc and attaches it to a scsi_cmnd so everything just work as before. Signed-off-by: FUJITA Tomonori Signed-off-by: James Bottomley --- drivers/scsi/hosts.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'drivers/scsi/hosts.c') diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 9a10b4335e76..f5d3fbb55717 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -268,6 +268,7 @@ static void scsi_host_dev_release(struct device *dev) } scsi_destroy_command_freelist(shost); + scsi_destroy_command_sense_buffer(shost); if (shost->bqt) blk_free_tags(shost->bqt); @@ -372,10 +373,14 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) else shost->dma_boundary = 0xffffffff; - rval = scsi_setup_command_freelist(shost); + rval = scsi_setup_command_sense_buffer(shost); if (rval) goto fail_kfree; + rval = scsi_setup_command_freelist(shost); + if (rval) + goto fail_destroy_sense; + device_initialize(&shost->shost_gendev); snprintf(shost->shost_gendev.bus_id, BUS_ID_SIZE, "host%d", shost->host_no); @@ -399,6 +404,8 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) fail_destroy_freelist: scsi_destroy_command_freelist(shost); + fail_destroy_sense: + scsi_destroy_command_sense_buffer(shost); fail_kfree: kfree(shost); return NULL; -- cgit v1.2.1