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scsi-disk: Move active request asserts

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SCSI read/write requests should not be re-issued before the current
fragment of I/O completes.  There are asserts in scsi-disk.c that guard
this constraint but they trigger on SPARC Linux 2.4.  It turns out that
the asserts are too early in the code path and don't allow for read
requests to terminate.

Only the read assert needs to be moved but move the write assert too for
consistency.

Reported-by: Nigel Horne <njh@bandsman.co.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2010-11-12 09:57:11 +00:00 committed by Kevin Wolf
parent f711df67d6
commit 6fa2c95f27
1 changed files with 6 additions and 6 deletions
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12
hw/scsi-disk.c
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@ -170,6 +170,9 @@ static void scsi_read_request(SCSIDiskReq *r)
return;
}
/* No data transfer may already be in progress */
assert(r->req.aiocb == NULL);
n = r->sector_count;
if (n > SCSI_DMA_BUF_SIZE / 512)
n = SCSI_DMA_BUF_SIZE / 512;
@ -197,9 +200,6 @@ static void scsi_read_data(SCSIDevice *d, uint32_t tag)
return;
}
/* No data transfer may already be in progress */
assert(r->req.aiocb == NULL);
scsi_read_request(r);
}
@ -269,6 +269,9 @@ static void scsi_write_request(SCSIDiskReq *r)
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint32_t n;
/* No data transfer may already be in progress */
assert(r->req.aiocb == NULL);
n = r->iov.iov_len / 512;
if (n) {
qemu_iovec_init_external(&r->qiov, &r->iov, 1);
@ -298,9 +301,6 @@ static int scsi_write_data(SCSIDevice *d, uint32_t tag)
return 1;
}
/* No data transfer may already be in progress */
assert(r->req.aiocb == NULL);
scsi_write_request(r);
return 0;