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[PATCH] libata: fix WARN_ON() condition in *_fill_sg() 

For ATAPI commands, padding can reduce qc->n_elem by one and thus to
zero making assert(qc->n_elem > 0)'s in ata_fill_sg() and qs_fill_sg()
fail for legal commands.  This patch fixes the assert()'s to take
qc->pad_len into account.

Although the condition check seems a bit excessive, as this part of
code isn't still stable yet, I think it's worth to keep those.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2006-02-20 23:48:37 +09:00 committed by Jeff Garzik
parent bd71c2b174
commit 9ae61c6cb6
2 changed files with 2 additions and 2 deletions
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2
drivers/scsi/libata-core.c
View File

@ -2570,7 +2570,7 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
unsigned int idx; unsigned int idx;
assert(qc->__sg != NULL); assert(qc->__sg != NULL);
assert(qc->n_elem > 0); assert(qc->n_elem > 0 || qc->pad_len > 0);
idx = 0; idx = 0;
ata_for_each_sg(sg, qc) { ata_for_each_sg(sg, qc) {

2
drivers/scsi/sata_qstor.c
View File

@ -277,7 +277,7 @@ static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
u8 *prd = pp->pkt + QS_CPB_BYTES; u8 *prd = pp->pkt + QS_CPB_BYTES;
assert(qc->__sg != NULL); assert(qc->__sg != NULL);
assert(qc->n_elem > 0); assert(qc->n_elem > 0 || qc->pad_len > 0);
nelem = 0; nelem = 0;
ata_for_each_sg(sg, qc) { ata_for_each_sg(sg, qc) {