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s390/qdio: reset old sbal_state flags

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commit 64e03ff726 upstream.

When allocating a new AOB fails, handle_outbound() is still capable of
transmitting the selected buffer (just without async completion).

But if a previous transfer on this queue slot used async completion, its
sbal_state flags field is still set to QDIO_OUTBUF_STATE_FLAG_PENDING.
So when the upper layer driver sees this stale flag, it expects an async
completion that never happens.

Fix this by unconditionally clearing the flags field.

Fixes: 104ea556ee ("qdio: support asynchronous delivery of storage blocks")
Cc: <stable@vger.kernel.org> #v3.2+
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julian Wiedmann 2018-05-16 09:37:25 +02:00 committed by Greg Kroah-Hartman
parent bcd169a272
commit 97e3dcc08e
2 changed files with 2 additions and 4 deletions
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1
arch/s390/include/asm/qdio.h
View file

@ -262,7 +262,6 @@ struct qdio_outbuf_state {
void *user;
};
#define QDIO_OUTBUF_STATE_FLAG_NONE 0x00
#define QDIO_OUTBUF_STATE_FLAG_PENDING 0x01
#define CHSC_AC1_INITIATE_INPUTQ 0x80

5
drivers/s390/cio/qdio_main.c
View file

@ -641,21 +641,20 @@ static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
unsigned long phys_aob = 0;
if (!q->use_cq)
goto out;
return 0;
if (!q->aobs[bufnr]) {
struct qaob *aob = qdio_allocate_aob();
q->aobs[bufnr] = aob;
}
if (q->aobs[bufnr]) {
q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
q->sbal_state[bufnr].aob = q->aobs[bufnr];
q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
phys_aob = virt_to_phys(q->aobs[bufnr]);
WARN_ON_ONCE(phys_aob & 0xFF);
}
out:
q->sbal_state[bufnr].flags = 0;
return phys_aob;
}