Refactoring of the Atari floppy driver when converting to blk-mq
has broken the state machine in not-so-subtle ways:
finish_fdc() must be called when operations on the floppy device
have completed. This is crucial in order to relase the ST-DMA
lock, which protects against concurrent access to the ST-DMA
controller by other drivers (some DMA related, most just related
to device register access - broken beyond compare, I know).
When rewriting the driver's old do_request() function, the fact
that finish_fdc() was called only when all queued requests had
completed appears to have been overlooked. Instead, the new
request function calls finish_fdc() immediately after the last
request has been queued. finish_fdc() executes a dummy seek after
most requests, and this overwrites the state machine's interrupt
hander that was set up to wait for completion of the read/write
request just prior. To make matters worse, finish_fdc() is called
before device interrupts are re-enabled, making certain that the
read/write interupt is missed.
Shifting the finish_fdc() call into the read/write request
completion handler ensures the driver waits for the request to
actually complete. With a queue depth of 2, we won't see long
request sequences, so calling finish_fdc() unconditionally just
adds a little overhead for the dummy seeks, and keeps the code
simple.
While we're at it, kill ataflop_commit_rqs() which does nothing
but run finish_fdc() unconditionally, again likely wiping out an
in-flight request.
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
Fixes: 6ec3938cff95f (ataflop: convert to blk-mq)
CC: linux-block@xxxxxxxxxxxxxxx
CC: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
--
Changes from RFC:
Jens Axboe:
- kill ataflop_commit_rqs()
- call finish_fdc() unconditionally in fd_rwsec_done1()
---
drivers/block/ataflop.c | 18 +++---------------
1 file changed, 3 insertions(+), 15 deletions(-)
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 96e2abe34a72..a9d3b24cc8f5 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -653,9 +653,6 @@ static inline void copy_buffer(void *from, void *to)
*p2++ = *p1++;
}
-
-
-
/* General Interrupt Handling */
static void (*FloppyIRQHandler)( int status ) = NULL;
@@ -1228,6 +1225,7 @@ static void fd_rwsec_done1(int status)
}
else {
/* all sectors finished */
+ finish_fdc();
fd_end_request_cur(BLK_STS_OK);
}
return;
@@ -1475,15 +1473,6 @@ static void setup_req_params( int drive )
ReqTrack, ReqSector, (unsigned long)ReqData ));
}
-static void ataflop_commit_rqs(struct blk_mq_hw_ctx *hctx)
-{
- spin_lock_irq(&ataflop_lock);
- atari_disable_irq(IRQ_MFP_FDC);
- finish_fdc();
- atari_enable_irq(IRQ_MFP_FDC);
- spin_unlock_irq(&ataflop_lock);
-}
-
static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@@ -1491,6 +1480,8 @@ static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
int drive = floppy - unit;
int type = floppy->type;
+ DPRINT(("Queue request: drive %d type %d last %d\n", drive, type, bd->last));
+
spin_lock_irq(&ataflop_lock);
if (fd_request) {
spin_unlock_irq(&ataflop_lock);
@@ -1550,8 +1541,6 @@ static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
setup_req_params( drive );
do_fd_action( drive );
- if (bd->last)
- finish_fdc();
atari_enable_irq( IRQ_MFP_FDC );
out:
@@ -1962,7 +1951,6 @@ static const struct block_device_operations floppy_fops = {
static const struct blk_mq_ops ataflop_mq_ops = {
.queue_rq = ataflop_queue_rq,
- .commit_rqs = ataflop_commit_rqs,
};
static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
--
2.17.1
