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linux-sg2042
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[SCSI] libsas, bsg: pass errors through correctly 

Currently in BSG, errors returned in req->errors aren't passed back to
the calling programme (either via SG_IO or via read/write).  Fix this,
while preserving the SCSI convention of returning status in
req->errors.

Now update libsas to return errors correctly instead of to ignore
them.

Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley 2007-12-29 10:59:53 -06:00
parent 2d4b63e150
commit 2d507a01da
2 changed files with 13 additions and 2 deletions
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14
block/bsg.c
View File

@ -445,6 +445,15 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
else
hdr->dout_resid = rq->data_len;
/*
* If the request generated a negative error number, return it
* (providing we aren't already returning an error); if it's
* just a protocol response (i.e. non negative), that gets
* processed above.
*/
if (!ret && rq->errors < 0)
ret = rq->errors;
blk_rq_unmap_user(bio);
blk_put_request(rq);
@ -837,6 +846,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct bsg_device *bd = file->private_data;
int __user *uarg = (int __user *) arg;
int ret;
switch (cmd) {
/*
@ -889,12 +899,12 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (rq->next_rq)
bidi_bio = rq->next_rq->bio;
blk_execute_rq(bd->queue, NULL, rq, 0);
blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
if (copy_to_user(uarg, &hdr, sizeof(hdr)))
return -EFAULT;
return 0;
return ret;
}
/*
* block device ioctls

1
drivers/scsi/scsi_transport_sas.c
View File

@ -173,6 +173,7 @@ static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
handler = to_sas_internal(shost->transportt)->f->smp_handler;
ret = handler(shost, rphy, req);
req->errors = ret;
spin_lock_irq(q->queue_lock);